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July 2013

New York's Most Frequently Occurring High & Low Temperatures

Thermometer

 

Over the course of a year there is an array of high and low temperatures, typically ranging between 10° and 100° in New York (Central Park).  With such a wide variance, no one reading dominates.  However, each year has a few that occur more often than others.  Curious to know which they were, I did an analysis of every year's daily high/low temperatures between 2000 and 2020.  And here is what I found:

 

  • During this twenty-one-year period, the most common high temperature was 83°, while the most commonly occurring low was 64° (with 68° a very close second).
  • 83° was the most common high temperature in five years (three of them consecutive, 2006-2008) while 50° was the most common low temperature in three years.
  • For the most part the most common high temperatures fall in the 78°-85° range while most common lows are in the 63°-70° degree range.
  • The greatest occurrence of a high temperature in a single year was in 2005 when there were 20 days with a high of 82°.  For low temperatures, 2001 and 2009 had lows of 67° and 63°, respectively, seventeen times.
  • The greatest occurrence of a temperature in an individual month is eight times, and it's happened twice: In July 2006, with a low temperature of 71°, and in July 2014 with a low temperature of 72°. 

  Chart - most frequent high and low_cumulative

 Chart - most frequent high and low 2000-2020

 

 

 

 

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Ten Inches of Monthly Precipitation Becoming More Common in New York

Flooded_highway2

 

June 2013 was the twenty-fifth month to receive ten inches or more of precipitation in New York (going back to 1869).  It's not a common occurrence, but in the past ten years it's been happening more often.  Between 1869 and 2002 it occurred once every eight years, but since 2003 a month with ten inches of precipitation has happened once every 1.3 years (eight times).  An argument can be made that this is likely the result of global warming, which has put more water vapor in the air, at least in the Northeastern U.S.  Here are some more wet facts:

 

  • The greatest amount of time between months with ten inches of precipitation was 21 years, which occurred between 1913 and 1933.  Next longest period was 18 years, between 1955 and 1972.
  • 1983 is the only year that had back-to-back months with ten inches or more of precipitation (in March and April).  However, 1983's precipitation totals are suspect because, as many students of New York weather remember, Central Park's rain gauge was broken for part of the year, calling into question the veracity of precipitation totals.  
  • After 1983 the closest that two consecutive months came to having ten inches of precipitation each was August and September 2011.  September had 9.39" after 18.95" fell in August (the rainiest month on record).  Next closest was in 1933 when August had 8.85" and September measured 10.09". 
  • Some very wet months have followed or preceded some of the driest.  For example:

 

BIG SWINGS IN MONTHLY PRECIP
         
Year        
2007 April 13.05" May   1.88"
2005 Sept   0.48" Oct 16.73"
2004 Sept 11.51" Oct   1.18"
1980 Feb   1.04" March 10.41"
1955 July   0.51" Aug 10.86"
1944 Aug   1.84" Sept 10.30"
1934 Aug   2.77" Sept 11.96"
1913 Oct 12.97" Nov  2.16"
1903 Oct 13.31" Nov  0.97"
1882 Aug   1.14" Sept 16.85"

Very Warm Low Temperatures Made July 2013 Heat Wave New York's Hottest on Record

Veryhot

 

In a recent post about New York's major heat waves, a key finding was that the nine-day heat wave of July 1977 had the distinction of being the hottest heat wave of seven days or longer.  This was based on the average high temperature.  However, when low temperatures are added to the equation a different story emerged. 

 

It turns out that New York's seven-day heat wave of July 14-20, 2013 had the warmest average low of any lengthy heat wave - 79.0°.  And although the average high during these days, 94.6°, put it in the middle of the pack, when it was averaged with the low temperature, the resulting mean temperature of 86.8° (the average of the high and low) made it the hottest of all the major heat waves.  It bested a heat wave in August 1988 by 0.1 degree.  And 1977?  It fell to third.

 

Heatwave5

 

12 HOTTEST HEAT WAVES RANKED BY MEAN TEMPERATURE  
(Heat Waves of 7 Days or More)  
           
    Average Average    
Year Dates (# of Days) High Low Mean  
2013 July 14-20 (7) 94.6 79.0 86.8  
1988 Aug 9-15 (7) 95.3 78.0 86.7  
1977 July 13-21 (9) 97.1 75.6 86.4  
1955 Aug 1-7 (7) 96.1 75.3 85.7  
1944 Aug 10-17 (8) 96.6 74.0 85.3  
1973 Aug 28 - Sept 4 (8) 95.4 75.0 85.2  
1993 July 7-16 (10) 95.7 74.5 85.1  
1983 July 12-18 (7) 95.0 74.9 85.0  
2002 July 29 - Aug 5 (8) 94.0 75.5 84.8  
2002 Aug 11-19 (9) 94.2 75.2 84.7  
1953 Aug 24 - Sept 4 (12)* 95.4 73.9 84.7  
1991 July 15-21 (7) 96.6 71.7 84.2  
           
*Lengthiest on record        

 

Another striking characteristic of July 2013's heat wave was its relatively small diurnal variation - average high and low were 15.6 degrees apart.  By comparison, most of the other heat waves among the twelve hottest had diurnal variations greater than twenty degrees.  (1991's was the greatest, at nearly 25 degrees.)  Meanwhile, the last two days of 2013's heat wave had diurnal variations of just 13 degree and 12 degrees (high/low of 96°/83° and 93°/81°).

 


New York's Lengthiest & Hottest Heat Waves

Heat_wave

 

A heat wave, at least in the Northeast, is defined by the National Weather Service as three days in a row with high temperatures of 90° or hotter.  They occur, on average, about twice each summer.  However, this post is interested in "big boy" heat waves, i.e., those lasting seven days or longer.  Since records began in 1872 there have been just twenty-two, with one occurring about every seven years.  The seven-day heat wave of July 2013 broke a ten-year streak without one.

 

  • 2013 marked the 60th anniversary of New York's longest heat wave.  Lasting twelve days, it was also noteworthy because of how late in the summer it occurred, from Aug. 24 to Sept. 4, 1953.  Twenty years later an eight-day heat wave occurred from Aug. 28 to Sept. 4.  Both had an average high of 95.4°, fifteen degrees above average.
  • The heat wave with the highest average high temperature was the nine-day heat wave of July 1977.  Its average high was 97.1°, thirteen degrees above average.  It was made famous by New York's infamous blackout which happened on the first day of the heat wave.  The high temperature on the final day of this heat wave reached 104°.

 

Heat_wave_map

 

  • The heat wave that had the "coolest" average high temperature was the one that occurred between July 5-13, 1944.  During its nine days, high temperatures ranged between 91° and 94°, averaging "only" 92.4°.
  • New York's first week-long heat wave was in 1896, followed by a second in 1901.  Then the next one wouldn't be until 1944 - and that summer had two. 
  • Besides 1944, three other summers have suffered (or "enjoyed", depending on your preference) through two major heat waves: 1953, 1993 and 2002.  Five weeks before New York's longest heat wave on record, the summer of 1953 also had one of seven days in mid-July.  1993's two heat waves (one of ten days, the other of eight) occurred between July 7 and Aug. 4.  And in 2002, there were heat waves of eight and nine days in the three-week period between July 29 and Aug. 19.

 

Heatwave3

 

  • Half of the City's major heat waves occurred in the twenty-six years between 1977-2002.  And while a seven-day heat wave occurs once every six or seven years (when all years between 1872-2013 are considered), between 1977 and 2002 they occurred every other year.

 

Hottest heat waves in NYC

 

 

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Ranking Hot New York Summers by Concentration of 90-Degree Days

Hot_fun

 

Looking at the number of 90-degree days as the sole criterion for gauging how hot a summer has been is a fairly standard measure, but it can be misleading.  For instance, it doesn't take into account the fact that in some years 90-degree days are spread over considerably more weeks than other years.  That is the subject of this analysis.  For my purposes I'll be referring to the period between a year's first and last 90-degree day as the "window".  New York's typical 90-degree window (based on 1980-2020) is a few days shy of 13 weeks, starting in late May and continuing thru late August.  During this window, one in five days, on average, will see a high in the 90s or triple digits. 

 

Looking at records dating back to 1872, the most 90-degree days in a year has been 39 - and it happened twice - in 1991 and 1993.  However, while 1991's occurred over a lengthy span of 23 weeks, 1993's were more concentrated, occurring over five fewer weeks.  1991's hot days, in other words, were more "diluted".  While 1991 experienced 90-degree temperatures during 24% of its "window", 1993's corresponding figure was 31%. 

 

Central_park_summertime

 

Yet, neither of these hot summers come close to 1999.  Although that year had ten fewer 90-degree days, they were concentrated in a sixty-day window.  That means that close to half of the days during its 90-degree window were in the 90s.  And 1988 wasn't far behind, with 33 90-degree days over 77 days (43% concentration).  Four other years with a considerable number of 90-degree days (24 or more) also had a higher concentration of 90-degree temperatures than either 1991 or 1993.  So, you be the judge over which summer was hotter.  

 

Coney_island

 

The chart below ranks years with more than two dozen 90-degree days based on their concentration of hot days that occurred between their first and last 90-degree day.  (Although the summer of 2015 doesn't qualify for inclusion on the chart because it had twenty 90-degree days, its concentration was 25%.)

 

Concentraiton of 90-Degree Days


I'd like to to thank fellow weather fanatic, Eugene DeMarco, for helping me by supplying and organizing some of the weather statistics that provide the background material for this post. 

 

 

 

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The Heat is On: New York's "Hell Week", Hottest Week of the Year (July 16-22)

Flames

 

"Hell Week" refers to the time during the summer when New York City is most likely to have temperatures in the 90s.  The week beginning July 16 encompasses the three most likely days: July 18, July 19 and July 21.  Whereas the average day in July has experienced a 90-degree reading 29 times (since record-keeping began in 1869), July 18, 19 and 21 have reached 90° or hotter 45, 44 and 38 times, respectively (thru 2019).  And July 21 and 22 have had the most occurrences of triple-digit heat: six times on July 21 and four on July 22.  (And there's a mini-Hell Week between July 7-10, in which the average number of 90-degrees days is 33.)

 


Looking at the history of these dates reveals that July 18 didn't emerge as the date most likely to have a 90-degree reading until the late 1980s.  Before that, July 9, July 19 and July 31 were the dates that vied for bragging rights.  However, since 1980 60% of the years have had highs in the 90s on July 18 (including four years in a row from 2010-2013).  By contrast, before 1980 (going back to 1872) just 23% of the years had 90-degree highs.

 

90-DEGREE DAYS
   
  Daily Average
June 13.8
July 28.8
August 18.2
Summer* 20.3
Hell Week 36.2
   
July 16 35
July 17 34
July 18 45
July 19 44
July 20 35
July 21 38

*Note that "Summer" refers to meteorological summer, June 1- August 31.

 

Many readers may be surprised to discover that the two days most likely to see 90° has only a 30% chance in any given year to see temperatures that hot (i.e., 45 out of 151 years).  Perhaps it's because it's human nature to remember the days that are in the extreme.  Actually, even days in mid-summer have experienced long stretches without 90-degree readings.  For instance, there were no 90-degree readings on July 18 for twenty years in a row between 1923 and 1942.  And in the most extreme case, July 1 had no 90-degree readings between 1975 and 2011, a span of thirty-seven years.

 

Quizzical_look

 

Of course, as most New Yorkers are well aware, getting through "Hell Week" doesn't put us in the clear.  In fact, of twenty-two heat waves of seven days or longer, only a handful  have occurred in mid-July.  New York's longest heat wave on record, lasting twelve days, occurred between Aug. 24 and Sept. 4 in 1953.  The next longest, 11 days, started in the second half of July (July 23) in 1999.  And the third and fourth longest, both 10 days long, were in early August 1896 and early July 1993.

 

Chart - hottest hell weeks
   

 

Clipart_veryhot

 

I want to thank my fellow weather "nut", Eugene DeMarco of Queens, for helping me by supplying and organizing some of the weather statistics that provided the background material for this and recent posts.   

 

 

 

 

 

 

 

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Weather Analysis: Monthly Averages Can Deceive

0.0

April 2013 in New York was rather unique because it was just the third time since 1960 that a month had a mean temperature right at the monthly average, i.e., 0.0 degree difference.  The other two months in which this happened were August 1999 and August 1985.  However, what set April 2013 apart was the fact that its average high and average low were almost right at the average as well (-0.1/+0.1).  And while August 1999's high/low wasn't too far from average (-0.3/+0.3), August 1985's was significantly different (-1.3/+1.3).

 

April's near bulls-eye inspired me to examine all months that were relatively close to average, temperature-wise, to see how many had highs and lows both with departures from average of the same magnitude, and how many diverged significantly, but neutralized each other (like August 1985).  For my purposes I included all months that were either right at the average, or 0.1, 0.2 or 0.3 degree from average (+/-).  Since 1960 (thru 2020) there have been 63 months that fit this qualifier (which translates to an occurrence of about once a year).

 

Deceive

 

So, what were my findings?  Only six of the 63 months that reported a mean temperature close to average had highs and lows with departures from average that were nearly identical.  But perhaps the biggest finding was that March 2009 was actually closer to a 0.0 difference from average than April 2013, as its high temperature was 0.1 below average and its low was right at the average.  However, because of rounding, it ended up being 0.1 below average and not at 0.0 as April 2013 was. 

 

    Departure from Average Spread Between
    High Low High/Low
September 1989 -0.2 -0.2 0.0
March 1980 +0.1 +0.1 0.0
MARCH 2009 -0.1 0.0 0.1
August 1990 -0.2 -0.1 0.1
June 1995 +0.2 +0.3 0.1

 

On the other hand, as the chart below shows, there are "average" months that have highs and lows that diverge wildly from their averages, but balanced each other to produce a monthly mean temperature that was "average".  The most extreme case was November 1977.  Although its mean temperature was 0.1 degree below average, the month's high was 2.5 degrees below average while the low was 2.3 above average.  Two months before that, September 1977, exhibited a similar wide divergence.

 

    Departure from Average Spread Btwn
    Mean  High Low High/Low
November 1977 -0.1 -2.5 +2.3 4.8
September 1977 -0.2 -2.1 +1.8 3.9
September 1996 -0.2 -1.9 +1.6 3.5
June 1996 -0.2 -1.8 +1.4 3.2
April 1983 -0.1 -1.7 +1.4 3.1
October 1998 +0.1 -1.4 +1.5 2.9
March 2007 -0.3 +1.1 -1.6 2.7
August 1985 0.0 -1.3 +1.3 2.6
September 1982 -0.1 -1.3 +1.2 2.5
June 2006 -0.2 -1.3 +1.0 2.3
September 1960 -0.3 -1.4 +0.9 2.3

 

It's interesting to note that in all cases but one, the highs were below average while the lows were above average.  This greater propensity for low temperatures to increase is a classic sign of global warming, whereby a more persistent cloud cover, promoted by increased carbon dioxide levels, keeps heat from escaping at night.  

 

 

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A History of Drought in New York

Clipart_drought

 

Because New York is situated on a number of major storm tracks, it's never suffered a drought so serious that it resulted in tumbleweeds blowing through Times Square.  Of course, dry periods do occur, with the most prolonged being between 1954-1966, but nothing approaching the severity experienced in places like the Great Plains.  Since New York began compiling weather statistics in 1869, there have been 72 months that have received less than an inch of rain (monthly precipitation, on average, is about four inches).  That's about once every two years.  Here are some other dry facts (figuratively speaking) to ponder:

 

  • The last time less than an inch of rain fell in a month was in October 2013.  With just 0.36", it also has the distinction of being the driest month this century.  The second driest month this century was September 2005 when just 0.48" of rain fell.  Interestingly, it was followed by one of New York's rainiest months on record as 16.73" fell in October.
  • Back-to-back-months with less than an inch of rain have occurred only three times: Aug.-Sept. 1881; Dec. 1980-Jan. 1981; and June-July 1999.  The two months in 1999 have the record for the least amount of rain in two consecutive months, 1.03". 
  • Although a month with less than inch of rain occurs about once every two years, the longest stretch was 93 months which, oddly, occurred during the extended dry period in the 1950s and 1960s (Jan. 1956 thru Sept. 1963).
  • The most consecutive months with less than two inches of rain is five, which occurred between October 2001 and February 2002.  The most consecutive months with less than three inches of rain is eleven, which occurred between March 1965 and January 1966.  1965 is also the only year that had less than thirty inches of precipitation (26.09" was measured, about twenty inches below average).
  • October is the month most likely to get less than an inch of rain, having occurred in 13 years (including 2013).  Conversely, it's happened just once in April.
  • The closest a month has come to having no rain was in June 1949 when just 0.02" fell.  However, there have been two rain-free periods that have been longer than 30 days.  The first was 36 days in the fall of 1924 (Oct. 9 - Nov. 13) and the second occurred in 1999 when no measurable rain fell for a 35-day period between May 25 and June 28.  A rainless streak of two weeks or longer occurs, on average, about once every 13 months.
  • Looking at the driest 3-month periods, the driest occurred between July-September 1910 when a total of 2.98" of rain fell.  Three of the top-ten driest occurred in the consecutive years of 1964, 1965 and 1966.  Finally, among the top ten, listed below, the most recent was in 2001. 

 

DRIEST 3-MONTH PERIODS      
(Since 1900)        
           
Year Months 1st Month 2nd Month 3rd Month Total
1910 July-Sept  0.49 1.07 1.42 2.98"
1964 Aug-Oct  0.24 1.69 1.73 3.66"
1908 Sept-Nov  1.91 1.38 0.71 4.00"
1946 Oct-Dec  0.85 1.66 1.61 4.12"
1965 May-July 1.58 1.27 1.33 4.18"
1900-01 Dec-Feb 2.01 1.66 0.55 4.22"
2001 Oct-Dec  0.66 1.36 2.27 4.29"
1966 Jun-Aug  1.17 1.25 1.89 4.31"
1929 Jun-Aug  1.90 1.21 1.47 4.58"
1993 May-July 1.56 1.49 1.70 4.75"

 

 

 

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Weather Analysis: A Tale of Three Junes

Rain

 

The three Junes I'm referring to are those of 2013, 2009 and 2003.  They are New York's three rainiest Junes on record, with all receiving more than ten inches (10.26", 10.10" and 10.05", respectively).  But whereas 2003 and 2009 were much cooler than average (2003 is tied for 9th coolest), June 2013 was warmer than average.  Additionally, much of 2013's rain fell in a two-week period while 2009's fell in a 3-week period and 2003's was dispersed throughout.  In fact, going into the second half of the month it appeared 2013 had a sure shot at supplanting 2003 as wettest June as it had already received 9.60".  But then only 0.50" fell for the rest of the month and it fell 0.16" short of the record.

 

COMPARISON OF 3 JUNES  
           
    Departure Rainfall
Year Mean Temp From Norm Total 1st Half 2nd Half
2013 72.7 1.2 10.10" 9.60" 0.50"
2009 67.5 -3.7 10.05" 5.31" 4.74"
2003 68.4 -2.8 10.26" 7.33" 2.93"

 

 


1977 Weather Highlights for New York

 1977blackout

JANUARY

1 - For the sixth day in a row the high temperature was 32° or colder.  The average high during these days was 26°, fourteen degrees below average.  This morning's low was 15°, the coldest reading on New Year's Day since 1968 began with a low of 11°.

14 - The five inches of snow that fell this afternoon and evening was the biggest snowfall of the winter.

16 - This was the seventh day of the past ten to pick up measurable snow.  A total of 11.0" fell on these days, but just 0.6" accumulated today.  It fell upon passage of an Arctic front, which dropped the temperature to 7° midnight.

17 - With a frigid high of just 12° and a low of -2°, today was not only the coldest day of the year, but one of New York's coldest days in the second half of the 20th century.

25 - Although today's high/low of 37/28 was just one degree above average, it was the first day since Dec. 20 to have an above average mean temperature.  Below average temperatures resumed tomorrow and would continue thru Feb. 3.

28 - Today's high of 44° was the mildest reading of this brutally cold month.  The last time the temperature was this "mild" was on Dec. 20.  However, this respite was a brief one as another Arctic front pushed through during the afternoon and by midnight the temperature had tumbled to 13°.  

 

FEBRUARY

5 - This was the third year in a row in which two to three inches of snow fell on this date.  2.8" fell this year, all of it before daybreak.  The day's temperature held steady between 31° and 32° until mid-afternoon when Arctic air moved in; by midnight the temperature had dropped to 13°.

7 - With a high of 28°, today was the thirty-fifth day of the past forty-three (since Dec. 27) that had a high of 32° or colder.  During this frigid period, temperatures were ten degrees below average.

9 - With a high/low of 36°/21°, today marked the end of one of New York's most extended periods of very cold weather.  Between Dec. 21 and today, a period of 51 days, every day but three was colder than average.  This stretch of days was nearly nine degrees colder than average.  Additionally, this was the 51st day in a row with a low temperature of 32° or colder, the longest such streak this century.

10 - Today's low of 33° was the first above freezing this year, the deepest into the year for this occurrence since 1881 (when it happened on the same date).  Only 1875 had a later date (Feb. 23).

21 - Today's high was 32°, making this the only year in the 1970-2014 period to have a high of 32° or colder on this date.  This was also the only date between Dec. 3 and March 3 with just one occurrence until 2015, when there was another high of 32° on this date.

 

MARCH

5 - Today's high of 63°, nineteen degrees above average, was the first 60-degree reading in more than three months (since Nov. 27).

18 - The last snowfall of the season, measuring 0.6", fell at daybreak before changing to rain.  In total, the winter had 24.5" of snow, which was just about average.  Still, it was the snowiest winter since 1969-70 (which had 25.6").  

22 - A hard, cold rain fell, amounting to 3.44"; most of it poured down between 10AM-3PM.  This was was the year's biggest rainmaker until the monster storm of Nov. 6-7 that flooded the area with nine inches of rain.

29 - Today's temperature shot from 46° to 81°.

 

APRIL

5 - The 2.94" of rain that fell between April 2 and today accounted for much of the month's rain.  And tomorrow a 19-day period with no measurable rain would begin.

7 - The home opener for the Yankees was played in very chilly conditions.  After a morning low of 31°, the game was played with temperatures in the mid-40s.  At least skies were sunny.

12 - After a morning low of 50°, the temperature skyrocketed to 90°, the first 90-degree day of the year.  This was just three days after the low temperature was 25° (the fourth year in a row in which April saw a low in the 20s).  At the time this was the earliest date on record for a 90-degree temperature (since passed by April 8, 1991 and April 7, 2010).  This happened to be the day of the home opener for the New York Mets.

13 - This was the second day in a row of summertime heat as the high reached a record-setting 88°.

23 - This was the 18th day in a row with no measurable rain.  This followed a rainy four-day period (4/2-5) in which nearly three inches of rain fell. 

 

MAY

6 - Today's 0.47" of rain, which fell during a thunderstorm between 3-4AM, made this the rainiest day of a relatively dry month (1.71" fell in total). 

9 - It was a gray, damp and downright cold day, which felt more like early March.  The high/low was only 44/36, twenty degrees below average (the high was 25 degrees colder than average and was 40 degrees colder than just three days ago).  A trace of snow was reported late in the morning, the latest date on record for this occurrence.  This is the last time a temperature in the 30s was reported this late in May.

28 - Today's high was 92°, the ninth day in a row with a high of 80° or warmer (and twelfth of the past thirteen days).  This was the Saturday of Memorial Day weekend and was one of only five days to have a high in the 90s during the years Memorial Day has been a Monday holiday (since 1971).  During this warm spell, the mean temperature was 8.5 degrees above average.

 

JUNE

1 - Rain fell on this date for the sixth year in a row.  This year's rain amounted to 0.16" and fell mostly between 10AM-noon. 

28 - For the fifth year in a row rain fell on this date.  This year's rain, amounting to 0.28", fell during a nighttime thunderstorm between 9:30-10PM.

 

JULY

13 - Today was the start of a nine-day heat wave.  It was also the day that New York's infamous blackout occurred, beginning this evening.  Discussions about the blackout mention the heat, but today, which had a high of 93°, was one of the "cooler" days of the heat wave.

21 - Today's high of 104° was a record for the date and the third day of the last four to have a high in the triple digits.  Today was also the final day of a nine-day heat wave that saw afternoon highs average 97° (ten degrees above average). 

27 - Six days after a high of 104°, this morning's low was 57°.

 

AUGUST

9 - This was the fifth day in a row with a high in the 90s.  Highs during these days were 92, 93, 91, 90 and 90 (today).  The average high of this five-day heat wave, 91.2°, was well below that of the brutal nine-day heat wave in July (97.1°).

21 - Highs between Aug. 18 and today were: 77, 76, 77 and 76 (today).

 

SEPTEMBER

2 - The Friday leading into Labor Day weekend was a scorcher, with a high/low of 94/75, thirteen degrees above average.

 - On this Saturday of Labor Day weekend, today's high of 90° was the last 90-degree reading of the year.  In total, the year had twenty-two days in the 90s, the most since 1966 when there were thirty-five (average is eighteen).

28 - This was the seventh day in a row in which some rain fell.  Today's amount was just 0.03", which fell between 2-3 AM.  (The first day of this streak also had 0.03" of rain.)  In total, three inches of rain fell during the seven days. 

 

OCTOBER 

20 - The afternoon high reached 58° for the third day in a row.  (However, each day had a different AM low.)

22 - Today was the only day from 10/2 to 10/24 with an above average mean temperature.  During this period temperatures were eight degrees below average.  And today's high of 70° was the first in the 70s since 10/1.

27 - Today's high of 70° was the mildest reading this month (it also occurred on 10/1 and 10/22), making it the coolest maximum temperature in October of any year in the years since 1900 (thru 2019).  Typically the warmest reading in October is around 80°.

 

NOVEMBER

7 - One of New York's biggest rainstorms began this morning and continued through tomorrow afternoon.  The first wave of rain that moved through today, largely between 9AM and 5PM, amounted to 1.79".  However, the steady downpours that made this a historical storm would fall the next day.

8 - Five years to the date after one of NYC's largest daily rainfalls, an even bigger rainstorm flooded the area when 7.40" fell.  And this wasn't even the entire amount from the storm, as 1.79" fell the day before.  In total, rain fell for close to thirty-three hours, with the bulk of it pouring down today between 2AM-3PM.  This created a nightmare for commuters during the AM rush.   

14 - The morning low of 32° was the first reading of 32 or colder this fall, ten degrees colder than average.

27 - The first measurable snow of the winter, 0.2", fell between 9-10PM.  It was also the coldest day of the month, with a high/low of 33/29, eleven degrees below average.

30 - Off and on showers amounted to 0.38", bringing the month's total precipitation to 12.26".  However, this was 0.15" shy of the November record, set five years earlier.  Still, it was enough to make it the fifth wettest month on record (it's since fallen to tenth).

 

DECEMBER

1 - This was the ninth day of the last eleven to have rain.  The 0.73" that fell this morning, between midnight and 5:00, was the most to fall during these days.  In total, 2.71" fell during this damp period.

3 - For the third day in a row the high temperature was 47°.  And all three days had lows only in the low 40s.

13 - Today, with a high/low of 38/32 was the 32nd day in the past six weeks (beginning Nov. 2) to have a diurnal variation of less than ten degrees.  During these days the average variation was eight degrees.  The average high/low of 47/39 was a few degrees below average. 

 

To read highlights from other years between 1970 and 2018 double click here. 

 

 

 

 

 

 



 

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