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July 2012

Looking Back at New York Weather: July 31

 

1925 (Friday)

The biggest rainstorm of the year produced 2.14".  And although it was an all-day event, much of it fell between 6-11 PM, when 1.41" was measured.  The rain and clouds kept the temperature in the upper 60s all day.

1927 (Sunday)

Today's low of 70° was the last low in the 70s of the year, and the earliest date for this occurrence on record - a record that still stands.  (The last 70-degree low typically occurs during the first week of September.)  The year had nine days with lows of 70+, which was well below the average of 28 days.

1939 (Monday)

This July and the previous two all had the same average temperature - 76.6°.  However, 1937 had eight days with highs of 90+ (two in the triple digits), 1938 had three, and this year had four.  Also, this July had just 0.99" of rain (at the time the fourth driest July) while the previous two had more than five inches.

1950 (Monday)

Today's high of 94° was the the last reading in the 90s this year, the earliest date for this occurrence since 1903, when it fell on 7/30 (1934 and 1904 also had their last 90 on 7/31).  In total, there were only six 90-degree days this summer. 

1954 (Saturday)

This was the second day this summer with a high of 100° (the other occurrence was on 7/14).  Today, however, had the warmest mean temperature of the year as its low was 77°, compared to 69° on 7/14.

1985 (Wednesday)

The 0.06" of rain that fell between 4-7 PM brought the month's rainfall to 4.41", which was the same amount that was measured in June.  This joined similar occurrences in May-June 1917 and Nov.-Dec. 1945 (later joined by Dec. 1980-Jan. 1981 and Sept.-Oct. 1997).

1992 (Friday)

0.24" of rain fell in a five-minute period ending at 6 PM.

1993 (Saturday)

Today had the month's 20th high of 90°+, the most of any month.  (The average number for July is eight.)  July's average high was 90°, five-and-a-half degrees hotter than average.  Despite this record number of hot days, five Julys have been hotter, and their number of 90+ readings ranged between 14 and 18.

Clipart_frying_pan 

 

1994 (Sunday)

Today was the twenty-fifth day this month with a high of 85° or warmer (average number is 15).  Since then two other years had 25 (2011, 2022) and two others had 26 (2010 and 2016).

1996 (Wednesday)

Between 10-11 AM, 0.56" of rain poured down (and 1.01" fell for the entire day).  Additionally, the final twelve days of July were all cooler than average, with temperatures six degrees below the norm.

1998 (Friday)

The 0.33" of rain that fell this morning brought the month's paltry total to 1.09", making it one of the ten driest Julys on record.  This followed a very wet first half of the year in which 36 inches of precipitation fell - 60% above average.  (The following July would be even drier, in fact, the driest ever, with just 0.44" measured.)

 

Clipart_drought 

2000 (Monday)

One year after the hottest July on record, this July was the coolest since 1914, four degrees below average.

2003 (Thursday)

This was the first of twelve consecutive days in which measurable rain fell.  0.12" fell today, beginning at 10 PM.  During this streak (which lasted through Aug. 11) 5.57" of rain would fall.

2010 (Saturday)

Today was the seventeenth day in a row with a high temperature of 85° or hotter, the fourth longest streak of its kind since 1980 (the summers of 1988 and 1995 each had streaks of twenty-four days; and 2012 would have one of twenty-one days).  The average high during this streak was 90°, five degrees above average.  Additionally, today was the second day in a row with a high/low of 85°/66°, and followed another pair of days with the same high/low on July 28-29 (89°/74°).  This was just the third time for back-to-back pairs with the same highs/lows (joining Aug. 17-20, 1906 and March 3-6, 1952). 

 

85degrees

 

2012 (Tuesday)

At one point this  month, it appeared it had a good chance at becoming the hottest July on record, as temperatures were 5.4 degrees above average thru July 18.  However, the rest of the month was 1.8 degrees cooler than average and the month ended up tied as New York's 18th hottest (since 1869). 

2016 (Sunday)

For the third time in this final week of July an inch or more of rain fell.  Much of today's 1.08" (0.77") fell in a five-minute period between 8:39 and 8:44 PM - the greatest five-minute total in the years since 1970.  Today's rain brought July's total to 7.02", making it the rainiest month since April 2014.  And it was also the wettest July since 2009 (when 7.11" fell).

 

Weather_torrential_rain

 

2020 (Friday)

A new record for July was established this morning when the day's low temperature of 70° was the 26th day this month with a low of 70° or warmer, breaking the previous record from ten years ago.  However, for a while the record seemed like it might be in jeopardy when the temperature dropped from 74° to 70° during heavy rain showers late tonight. 

2022 (Sunday)

July 2022 joined July 1944 and August 2015 as the only three months on record in which no day had a high cooler than 80°.  The mildest reading this month was 81° on 7/18 and 7/26.  On average, July has six days with highs below 80°.  This streak of 80°+ days began on 6/29 (and today would be the last day of the streak, which was the 12th longest on record).  A big difference between this July and July 1944 is that month had seven more days with highs of 90+, while July 2022 had seven more days with lows in the 70s. 

 

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Revisiting New York's Hottest Summers

 

Although summer officially falls between June 21 and September 21 (give or take a day, depending on the year), for the purposes of this analysis the meteorological definition of summer is used, which is June 1 thru August 31.

 

Summer_heatwave 

 

  • New York's five hottest summers (since 1869) have all occurred since 1960: 2010, 1966, 1993, 1983 and 1999.  The fact that just one of the years is from this century may surprise some since these years were so warm worldwide.  
  • The summer of 1966, New York's second hottest on record, has the honor of having the hottest average monthly high temperature.  Although July 1999 was the hottest month on record based on mean daily temperature (average of the day's high and low), the average high in July 1966 was hotter than July 1999 by 0.1 degree, 90.3° vs 90.2°.  However, July 1999's average low was 3.5 degrees warmer (72.6° vs 69.1°) and that's what easily put it on top.      
  • Although 1991 and 1993 had the most 90-degree days for a calendar year, each with 39, 1993 had the most during the summertime period.  It had 35, followed by 1966 with 34 and 2010 with 32.  1991 had 31, ranking fourth.

 

Heatwave5

 

  • July 2010 missed tying July 1999 as NYC's hottest month on record because of a 0.1 degree difference in average high temperature.  However, 2010's consolation was that it become New York's hottest summer on record because June and August were hotter.  
  • Eight Julys have had a a mean temperature of 80.0° or higher (the most recent was in 2020).  The first time it happened was in 1952.  (July 2011 and 2010 are the only back-to-back Julys with mean temperatures above 80.0°.)  A monthly temperature this warm also occurred once in August, back in 1980. 
  • Two of New York's five hottest summers were also extremely dry.  1966 had the the driest summer on record, with every month receiving less than two inches of rain (1.17" in June; 1.25" in July and 1.89" in August).  The summer of 1999 was the fourth driest and featured the second driest June (0.59") and the driest July on record (0.44").  The combined rainfall of those two months was barely more than one inch (average rainfall in June and July is close to eight-and-a-half inches).

 

Other posts about summertime:

The Heat is On: New York's "Hell Week"

Unbearably Warm Summer Nights

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

New York's Hottest Weekends

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Today in New York Weather History: July 30

 

1949 (Saturday)

Today was the thirteenth day in a row with a high temperature of 89° or hotter.  Of these days, eight were in the 90s, including today, which had a high of 95°.  This was one month after an eight-day streak of highs of 88°+.

 

Firehydrantsummer

 

1960 (Saturday)

Three days after 1.50" of rain fell, the biggest rainstorm in five years (since Hurricane Connie) dumped 3.56" in a 12-hour period between 1 AM and 1 PM.  This heavy rain was produced by tropical storm Brenda, which moved over NYC on its way to New England.  At the time this was the second greatest daily amount in the month of July (it's now ranked third).

1966 (Saturday)

Today, with a high of 77°, was the only day this month to have a high cooler than 80° (on average July has six such days).  It was also the first day with a high in the 70s in six weeks, a period in which highs averaged 91°, eight degrees above average.  Twenty-three of the days had highs of 90° or hotter.  Besides the heat, there was very little rain, with just 1.29" measured.

1971 (Friday)

Three inches of rain fell, most of which came down between 6 AM-3 PM.  At its heaviest, 1.04" fell in the hour between 9-10 AM.  Because of the thick cloud cover there was little change in temperature, with the high of 75° just three degrees above the day's low.

1975 (Wednesday)

With a high/low of 87°/66°, today was the 14th day this month with a mean temperature at seasonable levels - the most of any month in the 1970-2022 period. 

1988 (Saturday)

Today's high topped out at 98°, a record for the date.  Later in the day I escaped the heat by leaving on vacation in the Canadian Rockies (where, four days later, a few inches of snow fell near Lake Louise inside Banff National Park).

 

98degrees

 

2000 (Sunday)

The 0.23" of rain that fell today (mostly from a shower in the pre-dawn hours) would be the last time rain fell on this date until 2015.

2006 (Sunday)

This was the third day in a row with a high of 89°.

2015 (Thursday)

A series of tropical downpours during the afternoon dumped 1.95" of rain - the first rain to fall on this date in fifteen years.  Today's amount was comparable to the rainfall of the past four weeks and was the biggest rainstorm since Jan. 18 (when 2.10" fell).  During one 20-minute period (between 1:25 and 1:45 PM) nearly an inch of rain poured down.  It was a very muggy day, with dew points in the low 70s and a high of 87°.

 

Wet umbrella 

 

 

 

 

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Today in New York Weather History: July 29

 

Summer downpour

 

In all of the years that weather records have been kept in Central Park (since 1869), July 29 has the distinction of being the date most likely to have measurable precipitation.  Through 2023, rain has been reported in 71 years, for an incidence rate of 46% (including 2021, 2022 and 2023).  At the other end of the scale, Sept. 5 has had rain in only 30 years.  (On average, for any given date, precipitation has fallen in 50 years.) 

 

1892 (Friday)

Today was the end of a five-day heat wave that saw the last two days reach highs of 97°.  The average high/low during these five days was 95°/76°.  (The two days preceding the heat weave had highs of 89°). 

1914 (Wednesday)

Today's low of 59° is the only time a low was in the 50s on this date, the only date in July to have this distinction.  (For history buffs, today was the day after WWI began.)

1963 (Monday)

Today was the sixth day in a row with a high in the 90s, with all days featuring clear skies.  This was the third heat wave in the past five weeks.  And although there were fifteen days with highs in the 90s during this period (including a record 98° on the 27th, and eleven other days with highs of 94° or hotter), there was also a stretch of nearly two weeks, July 3-15, that was five degrees cooler than average (including a record low of 54° on 7/9).

 

90s

 

1980 (Tuesday)

A monsoon-like rainstorm dumped 3.47" of rain during the latter part of the morning (9 AM-noon), with 1.38" pouring down between 10-11 AM.  This was the greatest daily rainfall in July since 1960 (later topped on July 24, 1997 when 3.75" fell).  Today's rain topped a record deluge earlier this year on April 9 by 0.05", making it  rainiest day of the year.

 

Clipart_flood_sign

 

2010 (Thursday)

Today's low of 74° was the 25th low of 70° or warmer this month, the most of any July (breaking a tie with 1999 and 1908) and the most of any month on record (this record would be broken in July 2020).  These lows were all concentrated in the 26 days between 7/4 and today.  (A typical July averages 14 lows in the 70s/80s.)  Looking at high temperatures, not only did this July have sixteen days in the 90s (double the typical number), it also had five days with highs of 89° - and today was the last of those 89-degree days. 

2011 (Friday)

An evening thunderstorm dumped 0.32" of rain in a five-minute period between 8:21-8:26 PM.

 

Clipart_severe_thstorm

 

2015 (Wednesday)

Since 7/19, four days briefly had the hottest temperature of the year: 93° on 7/19; 94° on 7/20; 95° on 7/28; and 96° today.  However, despite today's high, the hottest mean temperature of the summer was on 7/19, with a high/low of 94°/82°.  (Today's low was five degrees cooler.)  

2016 (Friday)

Slightly more than an inch of rain fell overnight thru 11 AM, bringing the month's rain total to 5.69", making this the rainiest month since December 2014.  It was also the wettest July in seven years.  (An additional 1.33" would fall on 7/30 and 7/31.)

2021 (Thursday)

Three days after July became the 27th month to have 10+ inches of rain, today it became the 15th to have more than 11 inches as a little under half-an-inch fell during thunderstorms between 5-9 PM.  The City escaped turbulent conditions that affected parts of NJ and eastern PA, where a number of tornadoes touched down.  And the thunderstorms that moved through the City weakened as they moved over Manhattan, reducing the predicted amounts of rain.  This was the 18th day that measurable rain fell in July; only July 1871 had more days (20).  However, July 2021 had twice as much rain.

2023 (Saturday)

Central Park missed by one degree of having the year's first heat wave (the previous two days had a highs of 92°).  However, with a high of 89° today was the 15th day in the past four weeks to have a high of 88° or hotter.   (Five days were in the 90s, three had highs of 89° and seven reported a high of 88°).

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Today in New York Weather History: July 28

 

Four

 

July 28 is one of two dates (the other is July 30) with four years sharing the record high - the most of any date.  The record of 97° has been reported in 1999, 1949, 1931 and 1892.  (There would be fewer ties if daily temperatures, like monthly averages, were reported to one decimal place.)   

 

1883 (Saturday)

The 0.08" of rain that fell today was the last rainfall of the month, bringing the month's total to 3.21", which was the same amount as last July.  Since then, it's happened two more times: Dec. 1916 and 1917 both had 4.25", while Dec. 1960 and 1961 both had 3.04".

1898 (Thursday)

Today was the second day in a row with a high/low of 80°/74°.  Coincidentally, last year also had a pair of consecutive days with the same high and low on July 27-28 (67°/64°).

1902 (Tuesday)

An evening thunderstorm between 6:45-8:30 PM flooded the City with 3.08" of rain, with almost all of it (3.00") falling in just an hour's time (and two inches fell in a 30-minute period).  This was Central Park's greatest 60-minute rainfall on record (until a storm on Sept. 5, 1913  dropped 3.31").

1913 (Monday)

11 years after an unprecedented one-hour downpour of 3.00" flooded the City on this date, nearly the same amount (2.74") fell this afternoon from 3-4 PM.

1921 (Thursday)

The high today was 94° and followed three days that had highs of 93° (yesterday), 92° and 91°.

 

Feeling hot hot hot

 

1982 (Wednesday)

2.18" of rain fell today, with half of it pouring down in the hour between 5-6 PM.  And within that hour 0.55" fell in the fifteen minutes between 5:00-5:15.

 

Clipart_hardrain

 

1985 (Sunday)

Today was the 13th day this month with a seasonable mean temperature (average of high/low), the second greatest number of any month in the 1970-2022 period (July 1975 had 14).   

1988 (Thursday)

Rain fell during twelve of the past fourteen days, amounting to 7.44" (and during fifteen of the past twenty days, measuring 8.13").  It was a tropical wetness, as eight of the 20 days between 7/9 and today had highs in the 90s (all between 7/9-18), and four others had a high of 88° or 89°.

1999 (Wednesday)

This was the eleventh day this month with a high of 95° or hotter.  And at 97°, today's high tied the record for the date (with three other years).

Clipart_broiling_sun

 

2008 (Monday)

The morning low of 66° was the coolest reading of the month (also reported on 7/11 and 7/25), the mildest coolest reading in July on record (until 2020, when the coolest reading was 67°).

2009 (Tuesday)

Today was the first day this month with an above-average mean temperature (high of 85°/low of 71° = mean of 78°) - and it was just one degree above average.

2015 (Tuesday)

Today's high of 95° was the hottest temperature on this date since 1999, when the record for the date, 97°, was reached.

2016 (Wednesday)

With a high of 95°, this was the seventh day of the past eight to see a high in the 90s (the one day without a high in the 90s, 7/26, had a high of 89°).  The average high during these eight days was 93°.  Today was also the 13th day of the past fifteen to have a high of 88° or hotter.

2023 (Friday)

Today's hot and steamy high/low of 92°/75° was the same as yesterday's, the third time this year a pair of consecutive days had similar highs and lows (the others were 4/25-26 and 5/28-29, with respective highs/lows of  60°/46° and 79°/59°.  This was the seventh year in which July 27-28 had identical highs/lows, the most of any pair of calendar dates.

 

Chart - july 27 july 28 same high low
 

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Looking Back at New York Weather: July 27

 

1951 (Friday)

Yesterday and today were the hottest days of the year, with both having a high/low of 94°/69°.

1977 (Wednesday)

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

1981 (Monday)

Between 1 AM and 3 AM, 1.65" of rain fell, with 0.98" of it coming down in the first hour.

1982 (Tuesday)

Today had the year's last reading in the 90s.  It came one month earlier than the usual date for this occurrence, and was the sixth earliest occurrence on record (the five earliest occurrences were between 1871-1902; 1982 would fall to seventh after the summer of 1986).  This summer's eleven 90-degree days were concentrated in the past twenty days.  During this nearly three-week period the average high/low was 89°/73°, five degrees above average.

 

Heatwave6

 

1997 (Sunday)

Today's 0.09" of rain was the last rainfall during the wettest July (8.36") since 1975.  (There wouldn't be a rainier July until 2021, when more than eleven inches fell.)

2004 (Tuesday)

1.36" of rain fell between 5 PM-1 AM.  Under overcast skies, the day's high reached only 71° (fourteen degrees below average), after a seasonably warm low of 68°.

2018 (Friday)

Thunderstorms rumbled through the area between 4 PM and 8 PM, making this the seventh day in a row in which rain fell.  The last time there was a streak this long was in June 2012.  The rain amounted to 0.25", which brought the month's total to 7.08", making it New York's wettest month since April 2014.  Central Park's rainfall, however, was light compared to Newark and Kennedy airports, which received more than an inch of rain, but it had more than LaGuardia, which reported just 0.06".

 

Chart - Rainy Streaks of 7+ Days

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Today in New York Weather History: July 26

 

1875 (Monday)

For the first time this year a daily rainfall of an inch or more fell  in Central Park - the latest date on record for this occurrence (a record that still stands).  Typically, the average date for the first one-inch+ precipitation total is in the first week of February (and it's happened on New Year's Day in seven years).

1966 (Tuesday)

Today's high of 97° was the twentieth day of the past thirty to have a high of 90° or hotter (four highs were in triple digits).  The average high during this period was 92°, seven degrees above average.

 

Solar flares

 

1979 (Thursday)

Although the morning low was a stifling 79°, ten degrees above average, the high, because of thick haze, only went up to 87°.  The last time a day with a low this warm didn't have a high of 90°+ was during the summer of 1908, when it happened twice (and it would happen again during the summer of 2016).  This was the warmest low temperature of the summer.

1985 (Friday)

1.19" of rain fell during the morning hours between 3 AM-noon.  Then, after a dry afternoon/early evening, an additional 0.99" fell after 8:30 PM, lasting until 5 AM on 7/27.  

1986 (Saturday)

Today's high of 90° was the last 90-degree day of the summer (and eleventh overall).  This was the earliest date for a year's last 90-degree reading since 1902 (and one day earlier than 1982).  During a mid-afternoon thunderstorm, 0.73" poured down in the 60 minutes between 2:54-3:54 PM.

1989 (Wednesday)

This was the hottest day of the summer, with a high/low of 96°/75°.

1991 (Friday)

In just 30 minutes, 1.10" of rain flooded the area in the middle of the afternoon (3-3:30).  During this half hour, 0.33" fell in five minutes, and 0.73" in fifteen minutes.  For the entire five-hour rain event (between 2:30-7:30 PM), 1.85" fell.

1996 (Friday)

0.46" of rain fell today, mostly in the morning.  This was the tenth year of the past twelve to have measurable rain on this date.

2000 (Wednesday)

The biggest rainstorm of the year soaked the City with 4.37".  Of that amount 3.24" fell today (a record for the date), and the rest fell on 7/27 thru 9 AM.  Today's high was just 69°, sixteen degrees below average.

 

Weather_torrential_rain 

 

2006 (Wednesday)

Today was the 13th day this month with a seasonable mean temperature (the average of the high/low).  This tied July 1985 for the second most such days in a month (in the 1970-2022 period).

2009 (Saturday)

In just five minutes 0.46" of rain fell between 6:23-6:28 PM, and 0.99" fell in the half hour between 6:12-6:42 PM.

2018 (Thursday)

Although an early morning shower produced just 0.03", it was the sixth day in a row with measurable precipitation, the fourth streak of this length this year.  This matches 1989's four streaks of six days (two of which were only two days apart during the month of June).

 

Chart - 6-Day Rain Streak

 

2021 (Monday)

For the second day in a row there was a heavy period of pre-dawn thundershowers; yesterday’s downpour produced 0.49”, today’s amounted to 0.78”.  Today’s amount pushed July’s rainfall over ten inches, joining 26 other months that have exceeded this amount (out of 1,831+ months, going back to 1869).  This was the first time a month had ten inches or more of precipitation since June 2013 and the most in any month since August 2011’s 18.95” (the rainiest month on record in Central Park).  The 10.48” that had fallen so far this month made it the third wettest July on record.

 

10+
 
 

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A Look Back at New York City Weather: July 25


1972 (Tuesday)

Twelve of the past fifteen days had highs of 88° or hotter, and nine of those were in the 90s (including today's high of 91°).  During these days, temperatures were close to five degrees above average.  Additionally, all fifteen days had lows in the 70s.

Weather.summertime

 

1975 (Friday)

An intense rainstorm dumped two inches of rain between midnight and 2 AM.  This was the sixth day in the past three weeks to receive more than an inch of rain.  Additionally, fourteen of the past twenty-three days had rain, which amounted to 11.77", enough to make this the second rainiest July on record.  Since no more rain fell for the rest of the month it would remain second, falling just 0.12" short of the 1889 record.

Clipart_flood_sign

 

1995 (Tuesday)

For the third year in a row the high was in the 90s on this date.  Today's high was 90°, last year's was 92° and the year before that it was 90°.

1997 (Friday)

Six inches of rain fell in the past five days, about 50% above the month of July's average rainfall.

1999 (Sunday)

Today's high of 97° was a record for the date and came in the early days of an 11-day heat wave that began on 7/23.

2001 (Wednesday)

Today's high was 94° after a low of 77°, making it the hottest day of the month.  This was just the fifth (and last) day with an above average mean temperature in July.

2010 (Sunday)

Today was the 22nd day in a row with a low of 70° or warmer, tying the streak in the summer of 1980 as the longest in the years going back to 1950 (thru 2022).  This summer's streak included nine days with lows of 75°+, and three of 80°.

2013 (Thursday)

Just four days after a torrid seven-day heat wave ended, today's high was only 68° (after a refreshing morning low of 64°).  This was the first time in eight years that a day in July had a high temperature in the 60s (and the next time it happened was eight years later, on 7/3/21) and was the result of overcast skies and an easterly wind coming off the ocean as a nor'easter-like disturbance developed well off shore. 

2015 (Saturday)

Today's high, and those of the previous three days: 85°-86°-87°-88° (today).  The streak was broken the following day when the high reached 90°.

2018 (Wednesday)

The 0.73" of rain that fell today, most of it at daybreak, brought the month's total rainfall to 6.80", exceeding the amount that fell in May and June combined.  July's total was the most to fall in any month in two years, since July 2016, when 7.02" was measured. 

2022 (Monday)

A six-day heat wave ended today when a severe thunderstorm in the early afternoon prevented the temperature from going no  higher than 86°.  In less than an hour 0.98” of rain fell between 1:00 and 2:00, and the temperature dropped to 73°.  But despite the temperature drop the dew point was in the mid-70s for three hours during the afternoon.  In the past ten days 4.10” of rain fell, mostly from six severe thunderstorms.  

 

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Days With Significantly Above or Below Average Temperatures in New York City

 

Up_down_arrows

Like most places, a typical year's weather in New York is comprised of regular swings in temperature, with occasional periods that vary significantly from the norm.  In the years since 1970, a typical month experienced five or six days in which the mean daily temperature (the average of the high and low) was ten degrees or more above or below average.  Of these days, a solid majority (61%) fell into the above-average column.  This analysis provides some perspective about years that were more extreme. 

 

  • Days that are 10 degrees or more warmer or colder than average have a decided seasonal skew.  42% of such days have occurred in the winter, 26% in the spring, 22% in the autumn and just 10% during summertime.  January typically sees a dozen days that are either much milder or colder than average while July experiences just two such days.  
  • There have been ten years in which days with significantly below-average mean temperatures outnumbered those that were above average.  The four most recent years in which this has happened were in the present century: 2000, 2003, 2009 and 2014.  1978 was the year with the coldest skew, with 68% of its days that were +/- 10 degrees being colder than average.  
  • Eight years had more than 80% of their significantly above/below average days come in at above average: 1990, 1991, 1998, 2001, 2006, 2010, 2012 and 2016.  91% of 1991's much above average days were on the warm side of the equation. 
  • 1991 had the most days that were 10 degrees or more above average, 76, while 1976 had the most days that were 10 degrees or more below average, 52.  2015 had the most total days of that were +/- 10 degrees, 94, with a little less than two-thirds of these days falling into the above average column. 
  • 1978 was the year with the fewest days that were 10 degrees or more above average, with 20 (more than half the typical amount), while 1991 and 1998 had the fewest days 10 degrees or more below average, with eight (one-third the norm).  The year with the fewest combined +/- 10 degree days was 2009, with 50 (2019 had 52).
  • 18 days in December 1989 were 10 degrees or more colder than average while at the other end of the spectrum December 2015 had 18 days that were 10 degrees or more milder than average.  In January 2000 and 2018 there were eight days of 10 degrees+ above average and eight days of 10 degrees+ below average. 
  • Since 1970 the most consecutive days with temperatures 10+ degrees warmer than average has been ten, which occurred between Oct. 6-15, 1990.  The longest streak of temperatures that were 10+ degrees colder than average has been eleven days, between Feb. 9-19, 1979.  
  • Looking at even more extreme variances from the norm, 1990 had the most days with mean daily temperatures 20 degrees above or below average, with thirteen.

 Chart - ten above or below average

 

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