December 2023 Weather Recap: 2023 Ends with New York's 2nd Mildest & 9th Wettest December

 

 

December 2023 became New York's second mildest December on record and its ninth wettest.  But despite it being such a mild month (5.5 degrees above average), the warmest temperature of the month was just 62° (on 12/18), which is typical for December’s mildest reading.  However, the month’s coldest reading, 25° on 12/22, was seven degrees milder than the typical coldest reading.

 

 

December had 6.71” of rain, making it the fourth month of 2023 with 6.50” of rain or more, something that’s happened in just five other years (2018, 2007, 1989, 1983 and 1901). 

 

 

After the coldest reading of the month on 12/22, 25°, the rest of the month had no readings of 32° or colder.  The average low between 12/23-12/31 was 42°, eleven degrees above average.

 

There were ten days with a mean temperature 10 degrees or more above average.  The most above average day was 12/28 which was 16 degrees above average (high/low of 55°/49°).   Only six days were colder than average.  The chilliest day was 12/22, with a high/low of 37°/25° (six degrees below average).

 

Three rainstorms produced more than 1.50” of rain.  They accounted for 5.68” of the month’s 6.71” of rain.

• 1.67" fell on Dec. 10-11
• 2.47" fell on Dec. 17-18 (2.21" on 12/18 set a record for the date)
  
• 1.54" fell on Dec. 27-28

 

Like last year, November and December of this year had only a trace of snow in Central Park, joining the winters of 1971-2 and 1972-73 as the only back-to-back winters with no measurable snow in Nov/Dec.

 

March and December had the same average temperature, but December’s was 5.5 degrees above average while March’s was 1.8 degrees above average.  And while December 2023 was the second mildest on record, March was the 25^th mildest.  Finally, December had twice as much rain as March.

 

 

Here are recaps of previous Decembers:

2022

2021

2020

2019

2018

2017

2016

2015

December 2022 Weather Recap: Rainy Month Ends With Wild Temperature Swings

 

 

December 2022 was the rainiest month of the year and also featured the coldest reading of all of 2022; this reading of 7° was the coldest temperature in December since 1989.  The month's s other stand-out weather story unfolded during its last nine days when there were wild swings in temperature.  Overall, the month's average temperature was 0.6 degrees below average (average high was just about average, while the average low was a degree below average.).

 

From 12/24 to 12/30 temperatures swung from 25 degrees below average (7° on 12/24) to 21 degrees above average (62° on 12/30).  But the wildest swing was on 12/23 when the mercury plunged 50 degrees between 4 AM and midnight, from 58° to 8°.  This was the greatest daily change in temperature on record (breaking a 101-year record, of 48 degrees in March 1921).

 

This was just the fourth December to be the wettest month of a year (the other years were 1957 <5.26">; 1973 <"9.98">; and 2019 <7.09">).  Although the amount of precipitation measured, 5.83", was 1.45" above average (making it the 20th wettest December on record), it was about three inches less than the average amount of a year's wettest month. 

 

Three rainstorms in December produced more than an inch of rain.  The last of them, on 12/22-23, produced the most, with 2.06" measured.  Much of the rain (1.33") came down in an hour when a blast of Arctic air collided with a fast-moving coastal storm in the pre-dawn hours of 12/23. 

 

Although a typical December averages nearly five inches of snow, this December had no measurable snow (LGA and Newark, however, had 0.4" and 0.1", respectively).  This was the 21st December with no snow and the 14th in which neither November or October had measurable snow (the previous time this happened was in 2015).

 

December had two days with lows in the 50s, which was the most such days since Dec. 2015 (the mildest December on record), which had 11.  This December also had seven days with highs of 55° or warmer, which was one less than Dec. 2021 (which was 4.3 degrees above average) and one more than 2020 (which was 1.7 above average).

 

Christmas Eve was sunny and bitterly cold (high/low of 15°/7°, with sub-zero wind chill) while one week later New Years Eve was mild (high/low of 55°/50°) and foggy with showers.  Christmas Day was sunny and cold (28°/14°) but relatively bearable compared to Christmas Eve.

 

Here are December recaps from the previous seven years:

2021

2020

2019

2018

2017

2016

2015

 

 

 

 

       

December 2021 Weather Recap: Mild & Dry

 

 
December 2021 was the third mildest on record (behind 2015 and 2001, and 0.1 degree ahead of 1984), and tied for fourteenth driest.  At 4.7 degrees above average, it was the most above average month of 2021 (passing October, which was 4.1 above average).  Although it ranked third for mean temperature (average of high/low), the month had the second mildest average low, and was tied for seventh mildest average high.

 

Seven days had mean temperatures that were 10+ degrees above average, and eight days had highs of 55° or milder (half of these days were in the 60s).  The mildest reading was 66° on 12/11, which was a record for the date.  Two extended periods of mild temperatures were largely responsible for the month being so mild, as Dec. 11-18 was 11 degrees above average (high/low of 56°/44°), and the last week of December was 8 degrees milder than average (48°/40°).  This was just the seventh December to have no temperatures of 32° or colder in the last seven days of the month. 

 

Six days had lows of 32° or colder (average number for December is 14), with the coldest reading being 25° on 12/20.  Only three other Decembers have had a milder reading as their coldest reading:  2015 (34°); 2012 (28°); and 1974 (26°).  And Dec. 1984's coldest reading was also 25°.  (On average, the coldest reading in December is in the upper teens; before 1970 it was in the low teens). 

 

Like November, December was quite dry, with just 1.39" of precipitation  measured.  Combined, these two months became Central Park's driest Nov.-Dec. on record.  Ironically, this dry combo occurred in one of the ten wettest years on record.  By contrast, the nine driest November-Decembers behind 2021 had about twenty inches less annual precipitation than 2021.

 

 

With the exception of the last week in October, which had 4.71" of rainfall (the wettest last week of October on record), the other 12 weeks between Oct. 1 and Dec. 31 had only 3.06". 

 

December had just 0.2" of snow, which occurred in the pre-dawn hours of 12/24.  However, meager snowfall in December isn't uncommon, as smaller amounts (or none at all) have occurred in five Decembers  since 2001, and nine since 1994 (once every three years).

 

Unusually low humidity was reported on two dates - 20% on 12/14, and 14% on 12/17 (both in the afternoon).  Going back to the early 1940s, 14% is the lowest humidity ever reported in December (the previous low was 16% on Dec. 8, 1981).  Humidity levels below 25% are very rare in December (most instances of low humidity occur in March and April).

 

Finally, the month, and year, ended on a mild note as the temperature at the stroke of midnight was 51° (after a high of 55°).  This was the mildest reading during the ball drop at Times Square since 2004 (and the fifth mildest ball-drop reading on record).

 

 

Other December recaps:

2020

2019

2018

2017

2016

2015

 

 

Snow Creates Excitement, But Rain Gets No Love

 

 

Pity the rain.  It doesn't generate anywhere near the levels of excitement accorded snow.  (In a Brady Bunch analogy, rain is Jan, snow is Marcia.)  Perhaps it's because snow is a seasonal treat confined mostly to four months of the year (in New York), while rain has a year-round presence.  Snow is also limited by geography, so persons from warm climates get a thrill when they encounter snow.  Sure, kids may enjoy jumping in puddles, and it can be comforting hearing the pitter-patter of rain on the roof, but rain never enthralls us the way snow does.  It possesses a certain "je ne sais quoi" that rain simply doesn't have.

 

 

Perhaps the enthusiasm for snow comes from childhood memories, e.g., sled riding, making snow angels, building forts, school closings, Christmas.  And although rain may generate feelings of gratitude from farmers, it doesn't inspire the fevered anticipation of a snowstorm.  No sporting events have been inspired by rain, nor does anyone think back wistfully about rain that fell on someone's wedding day; or a downpour that washed out a summertime barbecue; or a deluge that rained out a baseball game (football games, by contrast, are rarely cancelled because of snow). 

 

There's also something magical about how a snowfall muffles the din of the City, and how its shimmering silver-white color scheme can light up a winter night.  Rain, on the other hand, leaves behind a muddy residue and litters the sidewalks with broken umbrellas.  (And when I was growing up in suburbia, worms would appear on the streets after a rainfall.)

 

Snow transforms the cityscape as it piles on top of railings, mailboxes and cars, and beautifully etches tree branches.  (I've always been amazed that snow is able to accumulate on Manhattan's busy streets.)  With rain, everything basically looks as it did before the rain started, except that surfaces take on a sheen when wet (especially at night).   Another contrast is that snow depths can be easily gauged by sight, but not so much with rain.  While it's easy to tell the difference between a few inches of snow and a foot of it, can you tell the difference between a quarter-inch rainfall and one of one inch?  (OK, perhaps there are more puddles.)

 

 

I can attest to the draw of snow since my most popular posts, by far, are those that analyze snowfall, with audience-traffic many times greater than posts about rain.  (I've written 30 posts about various aspects of snow, double the number I've penned about rain.)

 

It should be noted that the love for snow doesn't extend to sleet.  And rain's attempts at a brand extension, i.e., freezing rain, gets even less love than rain.  Despite the accolades it receives, snow is by no means perfect.  Shoveling can bring on a heart-attack; flights are cancelled; plows push snow back onto recently shoveled sidewalks; eyeglasses get broken during snowball fights, and dogs whimper from the sting of rock salt on their paws.  But, like a favored child, these personality flaws are largely overlooked.  

 

The weather hobbyists among us pore over snowfall totals, fixating on every tenth of an inch of accumulation.  We become infuriated whenever a forecast doesn't deliver on its promise, and, oh, how we dread a changeover to sleet, or, God forbid, rain!  By comparison, there is very little grousing when a rainstorm "fizzles" out. 

 

Central Park's weather station is held in low regard by many because it seems to report lower snow totals than surrounding sites.  For some reason, it tends to have the least efficient water: snow ratio.  It may very well be a gross generalization (albeit based on years of observation), but it just seems that if Central Park and each of the area's three airports receive an inch of liquid precipitation, this amount will produce eight inches in the park, a foot at Newark, and and an amount somewhere in between at LaGuardia and JFK.  Who knows why?  (Detractors of Central Park's weather station suggest incompetence.)

 

One area in which rain and snow seem to get equal treatment is automobile advertising, where cars on rain-slicked streets seem to be featured just as often as those shown bounding through snow-covered country roads.

 

 

Finally, the snow experience in Manhattan is different from that of the suburbs.  The beauty of the snow lasts for just a day - two days max.  The sound of snowplows scraping the streets can be grating, and the transformation of snow into slush at street corners is dispiriting.  And be on the lookout for snow crashing down from the tops of buildings!  On the positive side, snow often results in suspension of alternate side of the street parking regulations, and those of us who are apartment dwellers aren't tasked with shoveling, so we can walk around taking selfies to our heart's content, or put on cross-country skies and pretend to be on a ski weekend.  And perhaps the best thing of all is that the hustle-bustle of the City is silenced for a brief time.

 

 

 

 

 

 

 

 

 

 

 

December 2020 Weather Recap: Two Storms Grab Headlines

 

 

The lasting memory of December 2020 will no doubt be the snowstorm of Dec. 16-17.  The 10.5" of snow that piled up was the biggest snowfall in December since 2010, and the thirteenth December snowfall of 10"+.  Another highlight was the intense rainstorm that blew through the City on Christmas morning.  The month was 1.7 degrees above average - the City's 34th mildest December (since 1869).  But despite being milder than average, it had more days with highs of 32° or colder than all of last winter (four vs. three).  Additionally, the big snowstorm produced more than twice as much snow as the previous winter (10.5" vs. 4.8").

 

• Five days had highs of 55° or milder while six days had lows of 25° or colder.  There were three days with highs in the low 60s, evenly spaced, on 12/1 (62°), 12/13 (62°) and 12/25 (61°).  Five of the six days with lows of 25° or colder had lows of 24° (the outlier was the reading of 20° on 12/19).

• The mildest and coldest periods of December occurred during the fifteen-day period from Dec. 11 thru Dec. 25.

 

 

• Christmas Day's high of 61° (before sunrise) made it the eighth Christmas with a high in the 60s, and the 0.92" of rain that fell was the third greatest amount on the holiday.  After the high was reached, the temperature fell steadily throughout the day and was down to 29° by midnight.  This 32-degree drop was the greatest of any calendar date in 2020.

• Although the month was on the mild side, five Decembers in the past ten years were even milder.

 

 

• December 2020 was the 29th December with ten or more inches of snow (nearly 20% of all Decembers).  However, it was the second mildest December (after Dec. 1912) to have this much snow.  Although their average temperatures weren't quite as mild as this December, the Decembers of 1948, 1959 and 2003 had considerably more snow (25.3", 15.8" and 19.8", respectively).

 

 

• Much of the month's 4.61" of precipitation (0.61" above average) fell from three storm systems, all which produced more than an inch of precipitation:  1.13" on Dec. 4-5; 1.52" on Dec. 16-17; and 1.16" on Dec. 24-25.

• Finally, similar to November, December had a lot of days with gusty winds, with Central Park having nine days with a peak gust of 33 mph or more.  The peak gust of 47 mph occurred early Christmas morning.

 

 

 

Other December recaps:

2019

2018

2017

2016

2015

 

 

 

Notable December Cold Snaps

Nearly 40% of Decembers since 1869, or 59, have experienced cold snaps/cold waves that lasted five days or longer (about half were seven+ days).  The most recent occurred in 2017.  In addition to the five-days+ qualifier, a cold snap needed to have an average high temperature of 32° or colder to be part of this analysis.  The longest of them lasted 15 days, in 1876; six have had sub-zero readings; six had twelve inches of of snow or more; and six had no snow whatsoever (not even a trace).  Finally, six Decembers had two periods of Arctic cold.

 

COLDEST

The coldest December cold wave occurred in 1917, when the six days between Dec. 26-31 had an average high/low of 17°/2°.  Most recently, the last six days of Dec. 2017 had an average high/low of 23°/15°, which tied for ninth coldest.

 

LENGTHIEST

Fifteen Decembers have had cold waves lasting ten or more days.  The lengthiest was 16 days in Dec. 1904 (average high of 32°/22°), followed by a 15-day stretch in 1876 (27°/17°).  The coldest of these lengthy cold waves was one of 10 days in 1872 (24°/10°).

 

 

TWO IN ONE MONTH!

Six Decembers had two significant cold snaps.  The last time it happened was in 1955, with one of five days and the other lasting six days (they were three days apart).  The two in 1917 covered 15 days (eight days apart).

 

 

COLD SNAPS MORE PREVALENT 100+ YEARS AGO

The greatest concentration of Decembers with cold waves was between 1876 and 1904, when 20 of the 29 Decembers had at least one cold snap.  The most consecutive Decembers to have a cold snap is four, which has happened four times: in 1901-1904, 1914-1917, 1932-35 and 1942-45; there have also been four three-year streaks, with the most recent being 1958-1960.  The most consecutive years without a cold snap is eight, and it's happened twice, in 1981-1988 and 2001-2008.  And there was a seven-year hiatus from 2010 to 2016.

 

SNOWIEST & LEAST SNOWY

Six cold snaps received more than 13 inches of snow.  The most was 22.5" in 1883, and 21.5" in 1872.  The most recent was in 2000 when 13.3" fell.  Five of the Decembers had snowstorms that dumped a foot or more, with the most being 18.0" on Dec. 26, 1872.  And although December 1942, with 6.0", isn't found on the "most snowy" list below, it's worth mentioning because it had measurable snow fall on six of the cold wave's ten days.

 

 

At the other end of the snow spectrum, ten December cold snaps had no measurable snow.  Eight of them were five or six days in duration, but December 1870 and December 1989 lasted 11 and 10 days, respectively.

 

BELOW- ZERO READINGS

Seven of the Decembers had at least one sub-zero low.  The most recent was in 1980 (on Christmas Day).  These cold waves accounted for all of the twelve sub-zero lows that have been reported in December.  And although December 1872 had no below-zero readings, it had the distinction of having six days in a row with lows in the single digits (ranging from 4° to 8°).  At the other end of the spectrum, the coldest temperature of five December cold snaps was a relatively mild 18° or 19° (most recently in 1970).

 

 

 

The Coldest Day of New York Winters

 

 

Since 1900 the average high/low on the coldest day of each winter has been 19°/6° (in the last third of the 18th century it was 14°/2°; in the 21st century it's risen to a relatively temperate 20°/9°).  The coldest day has occurred as early as Nov. 30 (winter of 1875-76) and as late as March 15 (winter of 1931-32).  Nearly half of the coldest days of New York's winters have occurred in the four-week period between Jan. 9 and Feb. 6.  For this analysis "coldest day" is based on daily mean temperature (average of high/low), not just the low temperature.

 

 

THE SPECTRUM OF THE BIG CHILL

The dates of the most frigid coldest winter day and the mildest coldest winter day are, in their respective years, one day apart.  The coldest of them all fell on Dec. 30, 1917, when the high/low was 2°/-13°.  At the other end of the spectrum, the mildest reading to have the distinction of being the coldest day of a winter was 31°/20° in the winter of 2001-02 on Dec. 31, 2001.  January 18 is the date to see the most coldest days of winter - six.  Three dates in February have been the coldest for five winters each: Feb. 2, Feb. 5 and Feb. 17.

 

 

TWO MEASURES OF "COLDEST"

Although the coldest day is usually the same date as the coldest temperature, they've occasionally occurred on different dates (on average, in one out of four winters).  For instance, although the coldest reading of all time is -15°, the coldest day of all time, based on mean temperature, had a low of -13°.  Although this is two degrees "warmer" than the coldest reading, the day's high of 2° was six degrees colder than the high on Feb. 9, 1934, so it ended up with a mean of -5.5° compared to a -3.5° in 1934.  (The most recent instance was the winter of 2019-20 as its coldest day was on Dec. 19, with a high/low of 25°/16°, while the coldest reading was 14° on 2/15.)

 

SIMILAR DATES

A number of consecutive years, or a few years apart, have had their coldest day on practically the same date.  And in one interesting case the coldest day of winters one hundred years apart (1916 and 2016) occurred on the same date - Feb. 15.  And the coldest day of the winters of 1884 and 1984 were two days apart, on 12/23 and 12/25, respectively.

 

 

FRIGID HOLIDAYS

The coldest day of some winters has fallen on a holiday.  The one exception is Christmas Eve day (but that may change in the winter of 2022-23 which had a Christmas Eve high/low of 15°/7°.) .

 

 

"COLDEST COLDEST, MEET MILDEST COLDEST!"

Of course, the coldest winters have a lot of very cold days that that would easily qualify as the coldest dates of many of the winters with average or above average temperatures.

 

 
 

 

SOMETIMES IT SNOWS

Snow falls very infrequently on the coldest day of the winter - just six winters have had an inch or more of snow on this day.  However, a few were significant, with the stand out being the 12.5" accumulation on the coldest day of the winter of 1966-67 (Feb. 9, which had a high/low of 16°/7°).

 

 

Finally, the coldest day of the winter of 1963-64 was preceded by a snowstorm that dumped 11.5" the day before, while three storms that followed the coldest day of winter by one day dumped more than ten inches.  The storm in February in 2003 dumped 16.3", but started on the coldest day of the winter, with 3.5" falling that evening.

 

   

 

 

 

 

 

 

December 2019 Repeats December 2018's Wet Conditions

 

 

December 2019 was the wettest month of the year and fifth wettest December on record (7.09" was measured).  Much of its precipitation fell in the first two weeks of the month.  In fact, the 5.05" that was measured during this period was the third greatest amount to fall in the first two weeks of any December.   Looking at temperature, the month was slightly above average (+0.8°).  Although Dec. 1-22 was 2.5 degrees colder than average, the rest of the month was mild enough (+9 degrees), to push the entire month into the above average column.  The mildest reading of the month was 58° (on 12/10), making this the first December since 2005 not to have any readings of 60° or warmer.  The coldest reading, 16° on 12/19, was three degrees colder than the typical coldest reading of December.  The 19th was also the only day that had a high of 32° or colder (25°).

 

Despite the month's surplus precipitation there were ten consecutive days with no measurable precipitation (Dec. 19-28).  This matched a 10-day stretch in September - the longest dry spells of the year.  (September 2019 had just 0.95" of rain, making it the eighth driest September on record).  Coincidentally, last year's wet December (ninth wettest) also had a ten-day stretch with no precipitation.

 

Being the wettest month of a year is rare for December.  Before 2019 only two other years had December as their wettest month - in 1957 (when 5.26" was reported) and in 1973 (9.98" was measured).  Another distinction for Dec. 2019 is that it was just the 13th month to have more than seven inches of rain as well as a streak of 10 or more days without any measurable precipitation.  (The longest streak during one of these months was thirteen days in June 2006).

 

In addition to the soggy first two weeks, other December highlights included the season's first measurable snowfall on 12/2 (1.3" fell) and an out of the ordinary snow squall of 10-15 minutes during the afternoon of 12/18 that ushered in the coldest weather of December (0.4" accumulated, and an additional 0.3" fell from a snow shower a few hours later).  Additionally, the first four days of the month had highs/lows stuck in the 30s, just the sixth time there's been a streak of this length or longer.

 

 

Finally, December 2018 and 2019 joined December 2008 and 2009 as the second pair of consecutive years to be among the ten wettest Decembers (2009 is #4; 2019 is #5; 2008 is #9; and 2018 is in tenth place). 

Previous December recaps:

2018

2017

2016

2015

 

 

Today in New York Weather History: December 17

 

 

Dec. 17 is the average date of the first high temperature of 32° or colder (based on the period 1970-2020).  It's happened as early as Nov. 22 (in 2008) and Nov. 23 (1989), and as late as Jan. 20 (1986).  In more than half of the years the first high of 32° or colder was 31° or 32°, but it's been as cold as 20° (which happened in the winter of 2007-08, when it occurred late, on Jan 3).   

 

1904 (Saturday)

A snowfall of six inches (three inches this evening, three inches tomorrow morning) came four days after a snowfall of seven inches.

 

1919 (Wednesday)

Four days after the temperature reached 61°,  tonight, shortly before midnight, the mercury dropped to one degree above zero.  This was the first of fifteen days this winter with lows in the single digits or colder.

 

 

1932 (Saturday)

Snow that began late in the morning continued through early morning on 12/18, amounting to 7.2".  Today's temperatures were also very cold, with a high/low of only 21°/10°.  (The snow was gone by Christmas Day, which had a high of 59°.)  The next measurable snowfall wouldn't be for another seven weeks (2/4).

 

1951 (Monday)

Today's frigid high/low of 20°/8° (22 degrees below average) would be the coldest day of the winter.  Skies were clear.

 

1971 (Friday)

This was the twelfth day in a row with above average temperatures.  During these dozen days temperatures were ten degrees above average.  Even after passage of a cold front early this morning, and temperatures falling throughout the day, the mean temperature was five degrees above the norm.  This stretch of mild weather followed a two-week period of colder than average weather. 

 

1973 (Monday)

The epic ice storm that began yesterday afternoon continued through this morning.  Conditions were worse than yesterday as sleet and freezing rain fell at an even heavier rate.  In total, 1.46" of precipitation fell - all in the form of sleet or freezing rain.  The temperature stayed below freezing all day, and by midnight had fallen to 17°. 

 

 

1996 (Tuesday)

Light showers through early afternoon amounted to 0.12".  This was the 146th day this year with measurable precipitation, establishing 1996 as the year with the most days of precipitation in the 20th century, passing 1972, the previous crown holder.  And there would be six additional days of precipitation before the year ended.  (The average number days of precipitation per year is 121.)

 

1998 (Thursday)

Today was the 25th day in a row with above-average temperatures.  During this stretch of mild days temperatures were ten degrees above normal.  (This would be the mildest December since 1984.)

 

 

 

2000 (Sunday)

Today's high of 62° was a record for the date, just one of five days with above-average temperatures during a December that was quite cold (5.5 degrees below average) - the coldest since 1989. 

 

2001 (Monday)

This was the 18th day in a row in which no low temperature was duplicated.  During these days (beginning on Nov. 30) they ranged between 32° and 58° - all above average.

 

2012 (Monday)

Only three degrees separated the day's high (43°) and low (40°) on a raw, "gloomy Gus" kind of day. 

 

2013 (Tuesday)

Light snow, occasionally mixed with sleet, fell throughout the daytime hours and amounted to 1.5".  This was the fourth snowfall of the past ten days, totaling 8.6".  Three of these snow "events" delivered one-inch+ - the most such snowfalls in December since 2005.  Besides being snowy, the ten days since 12/8 were also quite cold, with the average high/low of 35°/26° nearly eight degrees below the norm.  

 

 

2015 (Thursday)

It was a mild and rainy day.  The 1.25" of rain that was measured in Central Park fell mostly between 11 AM and 4 PM.  This was the eighth day in a row that had a mean temperature more than 10° degrees above average.  The average high/low during these days was 63°/52° - nineteen degrees above average.

 

2016 (Saturday)

Six days after the first measurable snow of the winter (0.4"), today saw the first snowfall of one inch or more as 2.8" accumulated between 4-8 AM.  Then it changed to sleet, then to freezing rain, all of which was over by noon.  (By contrast, last winter's first one-inch snowfall wasn't until 1/23 - the blizzard that buried the City under its biggest snowfall on record.)

 

 

2018 (Monday)

Light wraparound showers in the wee hours of the morning (amounting to just 0.03"), remnants from yesterday's rainstorm, made this the 152nd day this year with measurable precipitation, tying 1996 for the all-time record.  What distinguishes 2018 from 1996 is that its total precipitation for the year was more than five inches above 1996's (with two weeks remaining in 2018).

 

2021 (Friday)

Just three days after Central Park registered its lowest humidity level in December this century (20% later in the afternoon), today had an even lower humidity level - 14% (also during late afternoon).  As low as this was, it was twice as high as the 7%  humidity reported on 4/6 of this year.

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In a Rut: Temperatures Stuck in the 30s

 

 

This post was inspired by the first four days of December 2019, all which reported highs and lows in the 30s.  The last time there was a streak of this length was in January 1998, when there was one of five days.  Although days "stuck in the 30s" aren't rare, as a typical year sees a half dozen of them (including 2023), strings of three days or longer happen infrequently, about once very five years.  Not surprisingly, nine out of ten of these days have occurred from December thru March, with December having the most. (They've occurred as early as Oct. 26 and as late as April 11).

 

 

More than half of these days have reported measurable precipitation (57% to be exact); one in four have reported measurable snow.  Since many of these days have temperatures around freezing (two-thirds have a reading of 32° or colder for at least part of the day) the type of precipitation that falls is a mixed bag (i.e., rain, freezing rain, sleet, and wet snow).  Often the type of snow that falls doesn't readily accumulate on paved surfaces if the temperature is above freezing.  And although temperatures in the 30s are far from frigid, the fact that they're often accompanied by overcast skies or precipitation makes these days feel raw and colder than the air temperature. 

 

 

The most precipitation to fall on one of these "stuck" days was 2.03" on March 29, 1984 (high/low of 36°/34°); 1.8" of the precipitation was snow.  Additionally, there have been four other storms that produced two+ inches of liquid precipitation that crossed over to other days - in Jan. 1987, March 1967, Dec. 1930 and Dec. 1914 (all days were in the 30s).  The biggest of them all produced 3.49" of precipitation and lasted three days during the first week of March 1967; two inches of snow fell on the first day of the storm. 

 

Speaking of snow, the most to fall on a day with temperatures in the 30s for its entirety was ten inches on Feb. 10, 2010 (high/low was 34°/30°).  And 11.8" fell from a storm that crossed over into a second day on March 21-22, 1956.  In addition to these snowfalls, there have been nine others that dropped six to ten inches (most recently on March 21, 2018 when 8.2" fell on a day in which the high/low was 39°/31°). 

 

 

In the years since 1900, the longest streak of days stuck in the 30s is five, which has happened three times: in Jan. 1998, Dec. 1970 and in Dec. 1914.  The most days in one winter was 20, which occurred in the winter of 1997-98.  Every winter except one, 1924, has had two or more days stuck in the 30s. (The winter of 1924 had one day.)  Finally, the most in one month is eight, which has happened twice - in January 1987 and January 1998.  (December 2019 had seven.)

 

 

If this analysis leaves you cold, I also posted one last year about days stuck in the 70s.