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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°).

 


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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Unbearably Warm Summer Nights in New York

Hot_nights_nyc_firehydrant

 

It used to be that New York's most stifling overnight temperatures in the summer fell into the upper 70s - but lows of 80° or warmer were few and far between.  However, this began to change in the late 1970s.  Since then, lows of 80° or warmer have occurred 38 times (thru 2020) - still infrequent, but no longer unheard of.   As Sandy and Danny sang to each other so famously in Grease, "Oh, those summer nights!"

 

  • Looking at the years from 1950 onward, only 1952 and 1957 registered 80-degree lows before 1978.  But since 1978, nineteen years have had lows of 80+.  To put it another way, there were no 80-degree lows in the twenty year period between 1958-1977, but they've occurred every two or three years since 1978.
  • The most 80-degree lows were experienced during the summer of 2002, when there were four.  Four other summers have each had three such stifling readings: 2013, 2010, 1988 and 1980.
  • The warmest low temperature, 84°, has occurred four times, most recently on July 22, 2011 and July 15, 1995 and twice during the summer of 1908.  (2011's high was two degrees hotter than 1995: 104 vs 102; both days in 1908 had highs of just 93°).  Interestingly, on the day of New York's hottest temperature on record, 106° on July 7, 1936, the morning low was 77°.  Therefore, July 22, 2011 is the day with New York's hottest mean temperature (94°).

 

84LumberLogo

 

  • With the exception of 1952, when an 80-degree low occurred on June 26, all other 80-degree lows have occurred in July or August.  The latest date for such a warm low is Aug. 30, 2018.  This broke the previous record, in 1985 and 1988, by 14 days.
  • The summer of 1995 reported the most low temperatures of 77° or warmer, eleven - one which was 84° and the remaining ten were between 77°-79°.  It was followed by 1999 and 2002, with ten.
  • The biggest rise in temperature on a day with a low of 80° or warmer was 22 degrees, which happened on July 10, 1993 (102°/80°) and was equaled on July 6, 2010 (103°/81°).  The smallest rise in the past 100 years is eleven degrees, which was reported on Aug. 30, 2018 when the high/low was 92°/81°. However, there have been seven even smaller variations in the years before 1911, with the smallest being seven degrees, which occurred during the summers of 1906 and 1908, both with a high/low of 87°/80°.

 

Chart - smallest diurnal variation on hot days
 

  • A low in the upper 70s or warmer doesn't guarantee the afternoon high will soar into the 90s.  There have been fourteen instances where the high has stayed below 90° (three of them occurred in 2015, two in 2016).  The two days that failed to reach 90° with the warmest low occurred on July 26, 1979, when the high struggled to 87° after a low of 79°, and on July 15, 2016 when the high reached 88° after the same low.  The smallest diurnal variation when the low was 77° or warmer was seven degrees - and it also happened during the summer of 1979.  On Aug. 4, under a thick haze, the high struggled to reach 84°.
  • Twelve years since 1950 haven't had a low of 77° degrees or warmer.  The coolest "warmest" low was 74° degrees, which occurred in the summers of 1996, 1976 and 1962.
  • Between 1950 and 1977 the typical year had twenty-eight days with lows of 70° or warmer.  Since 1978 the average number of such day has risen to thirty-seven.  The most was 60 days in 2005; the fewest was eight in 1962.

 

80-Degree Lows
(1950-2012)    
  Daily Minimum Temp
Year 80+ 77-79 Total
2002 4 6 10
2010 3 5 8
1988 3 5 8
1980 3 3 6
2011 2 2 4
1999 2 8 10
1993 2 2 4
1952 2 2 4
2006 1 5 6
2005 1 6 7
2001 1 3 4
1995 1 10 11
1985 1 2 3
1982 1 1 2
1981 1 4 5
1978 1 1 2
1957 1 1 2

Note: Chart does not yet include 2013's three 80-degree lows, 2015's one or 2016's two.

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New York City Weather Analysis: Chilly Summer Days

Gray_fgggy_nyc

 

When summer arrives many of us think of heat waves, thunderstorms and tropical disturbances.  However, if the wind comes off the ocean or from out of the northeast, New York can experience gray, cool and damp conditions, with afternoon temperatures stuck in the 60s (or cooler).  The analysis that follows looks at days like this, going back to 1970, between June 1 and Aug. 31 (i.e., meteorological summer).  I've chosen mean temperature as my gauge to determine the degree of coolness.

 

  • For the most part, high temperatures are affected the most as cloud cover and rain keep temperatures from rising much during the daylight hours.  Although the chilliest days may have low temperatures that are 10 degrees cooler than average, afternoon highs can be 20 degrees below average.   
  • Since 1970 five summer days have had high temperatures that failed to get out of the 50s.  Four were in June (55° on June 2, 2015 and June 13, 1982; 57° on June 4, 2003; and 58° on June 3, 2015) and one in August (59° on Aug. 21, 2007).  In July, the chilliest high reading was 65° on July 22, 1992.  

 

Clipart_overcast_sikes

 

  • A typical summer has two or three such cool days.  However, six summers reported none (1981, 1984, 1994, 1995, 2008, 2010 and 2011) while the summer of 2000 had seven and the summer of 1977 had six.  Finally, there have been five Junes that had four of these cool days.

 

CHILLIEST SUMMER DAYS SINCE 1970
(Ranked by Mean Temperature)
         
        Below
  High Low Mean Average
JUNE        
6.02.2015 55 50 52.5 -14
6.04.2003 57 50 53.5 -14
6.13.1982 55 52 53.5 -17
6.01.2015 58 51 54.5 -12
6.09.1980 63 47 55.0 -15
6.03.1997 61 49 55.0 -13
6.14.2000 61 53 57.0 -14
6.02.1997 62 52 57.0 -11
6.02.1988 63 51 57.0 -11
6.06.1976 60 54 57.0 -12
         
JULY           
7.22.1992 65 53 59.0 -14
7.04.1978 62 58 60.0 -16
7.05.1979 69 53 61.0 -15
7.01.1988 71 53 62.0 -13
7.12.1990 67 58 62.5 -14
         
AUGUST        
8.21.2007 59 56 57.5 -17
8.29.1986 68 50 59.0 -14
8.22.2007 65 56 60.5 -14
8.12.1979 64 57 60.5 -15
8.29.1982 72 50 61.0 -12
         

 

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New York Weather History: July (1970 - 2021)

Clipart_overheated_sunHighlights:  Heat wave of July 14-20, 2013 had the highest mean temperature of any heat wave of seven days or longer; 104° on July 22, 2011; 103° on July 6, 2010; July 2013 had just the second three-day streak with highs in the triple digits; severe thunderstorms disrupted Diana Ross' free Central Park concert on July 21, 1983; 3.75" of rain fell on July 24, 1997 - the greatest 24-hour rain total in July; twenty 90-degree days in 1993, but no such days in 1996, 2000, 2004 or 2009; 2.09" of rain fell in one hour the night of July 17, 1995. 

 

July 1

July 2

July 3

July 4

July 5

July 6

July 7

July 8

July 9

July 10

July 11

July 12

July 13

July 14

July 15

July 16

July 17

July 18

July 19

July 20

July 21

July 22

July 23

July 24

July 25

July 26

July 27

July 28

July 29

July 30

July 31

 

 

 

 

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Looking Back at New York Weather: July 31

 

1925

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

Today's low of 70° was the last low in the 70s of the year, and the earliest date for the last 70-degree reading 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

This July and the previous two all had the same average temperature - 76.6°.  However, 1937 had eight days with 90+ highs (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

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

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

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

0.24" of rain fell in a five-minute period ending at 6:00 PM.

1993

This was the twentieth 90-degree day of the month, 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, there are five Julys that have been hotter, and their number of 90+ readings ranged between 14 and 18.

Clipart_frying_pan 

1994

Today was the twenty-fifth day this month with a high of 85° or warmer.

1996

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

1998

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

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

2003

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

Today was the seventeenth day in a row with a high temperature of 85° or hotter, the fourth longest streak of its kine 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

At one point in the month, it appeared the month 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

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

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 after 1 AM. 

 

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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

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

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 1AM and 1PM.  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

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

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

With a high of 87°/66°, today was the 14th day this month with a mean temperature at seasonable levels - the most of any month in the 1970-2020 period. 

1988

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

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

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

2015

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 and March 12 have the distinction of being the dates most likely to have rain.  Through 2020, measurable rain has been reported on both dates in 68 years, for an incidence rate of 45%.  At the other end of the scale, Sept. 5 has had rain in only 28 years.  (On average, for any given date, precipitation has fallen in 50 years.) 

 

1892

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

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

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 90-degree days 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

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 1980's rainiest day.

 

Clipart_flood_sign

2010

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

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

 

Clipart_severe_thstorm

2015

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 than 7/19's.)  

2016

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

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.

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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

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

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

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").

1921

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

Feeling hot hot hot
1982

2.18" of rain fell today, with half of it pouring down in a 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

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 1970-2020 period (July 1975 had 14).   

1988

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

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

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

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

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

2016

With a high of 95°, this was the seventh day of the past eight to see a high in the 90s (the one day not to have 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.

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