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June 2023 Weather Recap: Dry, Below Average Temperatures ... and Smoky Conditions

 

Nyc orange haze

 

After a May characterized by consistent sunny skies, June 2023 will likely be remembered for the one day, 6/7, when smoke from Canadian wildfires shrouded the City in an otherworldly orange haze.  This overshadowed the fact that June was the driest since 1999 (with 1.62" measured it became the 19th driest June overall) and was the coolest June since 2009 (two degrees below average).  Besides 6/7 there were other days that experienced low visibility because of the wildfires including the last three days of the month.   Other June highlights included:

 

  • The first two days of June were hot and sunny (with highs of 87° and 91°) but then the rest of the month was 2.6 degrees cooler than average, with only five days having above average temperatures. 
  • Less than 48 hours after a high of 91° on 6/2, the low on 6/4 was 49° - the first reading in the 40s in June since 2000.
  • There were just nine days with highs of 80° or warmer, about half the average number of days (17).  This was the fewest since 1985 which also had nine days (June 1958 had eight).
  • June's first day with a low in the 70s was on 6/25 and came more than two months after the year's first such low on 4/14 (the earliest date for a low this warm).
  • June and May were both cooler than average, the first time back to back months were below average since April and May 2020.  This was also the second month in a row with less than two inches of rainfall (and it was the fourth year in a row in which June had less than three inches of rain).  June 2023's rainfall was nearly three inches below average.
  • 2023 became the 11th year in which three of the years' first six months had less than two inches of rain.

 

Here are June recaps from the previous six years:

2022

2021

2020

2019

2018

2017

2016


June 2022 Weather Recap - Largely Uneventful, on the Dry Side

 

June 2022

June 2022 was slightly cooler than average (-0.6 degrees), and rainfall of 2.92" was 1.62" below average.  The first half of the month was 1.4 degrees above average, the second half was 2.6 degrees below average (ironically, the month's four warmest highs and lows were all in the second half of June).  This was the third June in a row with less than three inches of rain, but this June had more than the previous two (2.62" in 2021, 1.76" in 2020).  More than 70% of the month's rain fell in the first nine days of the month; less than an inch fell in the last three weeks.  Other observations:

 

  • The month's hottest reading was 90° on 6/25, which came six days after the coolest reading (54°).

 

  • The warmest mean temperature came the day after the hottest high.  At 89°/74°, it was also the most above average day of the month (+7 degrees).  The low was the only low in the 70s during the month.

 

  • Father's Day had the coolest low in June (at 54°, it was the coolest reading on Father's Day since 1958).  And with a high of 73°, it was the first Father's Day in ten years not to have a  high of 80° or warmer.  A week later, the low on the day of the Gay Pride Parade, 74°, was the warmest of the month (and tied for second warmest low on Gay Pride Sunday).

 

  • In between highs of 88° on 6/17, and 90° and 89° on 6/25 and 6/26, the seven days in between were six degrees cooler than average, with a high/low of 75°/60°.

 

Here are June recaps from the previous six years:

2021

2020

2019

2018

2017

2016

 

 

 

 


June Weather Recap: Two 4-Day Heat Waves Make June 2021 One of NYC's 10 Hottest

 

City sunflower 2021

With a scorching high of 98° on the last day of the month (along with a heat index of 106°), June 2021 became New York's ninth hottest June.  This was Central Park's hottest temperature since 2013, and the hottest reading in June since another 98° high in June 1994.  6/30 was also the last day of the month's second four-day heat wave, which was just the second time there were two heat waves of this length (or longer) in June (the other was in June 1943, the hottest June on record). 

 

The month's eight days with 90+ highs were the most in June since June 1991 (which had nine).  Only four Junes have had more hot days: 1943 (11), 1966 (10), 1925 (9) and 1991 (which was slightly cooler than June 2021, ranking as 14th warmest).

 

The month had nine days with lows in the 70s, tying it for ninth most in June.  The month's five days with lows of 75° or warmer was the most since there were six in June 1943.  (June 1909 had the same number as this June.)  Finally, in the years since 1940, the low of 76° on 6/6 was the fifth earliest date for a low this warm.

 

Ironically, despite the month's warmth, this June had the latest occurrence of a reading in the mid-50s since 1995, occurring on 6/23 (54°).  This was the coolest reading of the month (twelve degrees below average).

 

The month's two four-day heat waves were three weeks apart - June 6-9, and June 27-30.  The first heat wave averaged a high/low of 91°/74° (13 degrees above average), the second was 94°/75° (nine above average).  Both heat waves had a day with significant rainfall at night, 0.47" on 6/8, and 0.65" on 6/30.  Without these heat waves, the other days of the month were one degree cooler than average.

 

Besides the high of 98°, the last day of June was also the rainiest day of the month (0.65").  If it hadn't been for this rainfall, this would have been the second June in a row with less than two inches of rain, something that hadn't happened since 1978 and 1979.  These nighttime thundershowers cooled the temperature to 73°, erasing the day's morning low of 80°.  (If that sultry low had remained the day's low, this would have been the seventh, rather than ninth, hottest June.) 

 

With eight days of 90+ readings by 6/30, 2021 joined 20 other years (since 1869) to have this many by that date (1991 had the most - 15).  The last time there was this many by this date was in 1994.  Prior to that, between 1923-1994, this many days in the 90s by the end of June occurred much more regularly, once every four years.

 

Finally, in an interesting contrast, while the last four days of June had highs in the 90s (eleven degrees above average), the last four days of May all had lows in the 40s (ten degrees below average).

 

Girl_cooling_off_in_fountain_ethiogrio

Here are previous June recaps:

2020

2019

2018

2017

2016


June 2020: Warm & Dry

 

Hello summer2

 

June's temperatures rebounded after a chilly April and May (2.7 and 2.1 degrees below average, respectively).  At 2.3 degrees above average, it was the warmest June in 10 years (and 16th warmest overall).  Fourteen days were five degrees or more above average.  Besides being warmer than average, June was also on the dry side, with the least rainfall in 21 years (and 22nd driest overall).  The month had 1.76" of rain, which was very similar to May's 1.65" (like June, May was the 22nd driest).  This was just the sixth time (since 1869) that May and June both received less than two inches, and the first time that consecutive months had less than two inches of precipitation since April and May 2016 .  

 

Based on average temperature, June had the biggest warm-up following May since 2008.  And out of all of the years of measurement, it was the 12th biggest warm-up after May (tied with two other years).

 

Although the number of days of 80°+ was close to average (18, including the final twelve days of the month), it was well above average for days of 85°+.  13 days had highs of 85° or warmer, with 11 of them between 85° and 89°.  The two other days had highs of 90° (on June 22 and 28).  At one point there was a streak of seven days in a row with highs of 85°+, the longest streak in June since 2010.  Furthermore, the month's 11 days with lows in the 70s was more than double the average for June.  Only three other Junes have had more lows of 70°+ (2010, 2005, and 1943 had 12; June 1895 had the same number as June 2020).

85 plus
Through 6/26 it appeared the month would easily be among the ten driest Junes as just 0.98" had fallen.  Beginning 6/12 there were 15 days in a row with no measurable rainfall (the longest dry streak since the fall of 2017, which had a streak of 18 days).  Then 0.78" fell in the next three days.  The 0.58" that fell on 6/29 (in less than an hour) made it the rainiest day of June (and a wind gust of 47 mph was the highest of the month). 

 

Finally, the first half of 2020 was the driest since 1995 (16.15" was measured in Central Park, eight inches below average), and among all years it was the 17th driest first half of any year (tied with 1957).

 

Dry

 

Below are links for previous June recaps:

2019

2018

2017

2016

 

 

 

 

 

 


Recap of June 2019's Weather in New York

 

June banner

 

June 2019, like June 2018, was 0.2 degrees above average (this followed a May that was 0.2 degrees below average).  However, this June's average high was 0.6 degrees cooler than last June while its average low was 0.6 milder.  The first half of the month was 0.7 degrees cooler than average while the second half was 1.2 degrees warmer.  Similar to last June the warmest period came at the end of the month, with the four-day period between 6/26-29 six degrees above average (high/low of 89°/72°); this included the year's first high in the 90s (91° on 6/29, a month later than usual).  Although the month was average in the temperature department rainfall was an inch above average (5.46"), making this the rainiest June in six years.  The biggest daily rainfall was 0.86", which happened twice, on 6/2 and 6/25.  On both dates the rain poured down in less than an hour.  Here are a few other highlights:

 

  • Besides the year's first reading in the 90s being a month behind schedule, the year's first low in the 70s, on 6/25, was three weeks later than usual.  It was the first of five days in a row with a low in the 70s (6/30 looked to be the sixth but the temperature dropped to 69° as midnight approached).
  • Father's Day and Gay Pride Day both were seasonably warm (high/low of 80°/65° and 83°/69°) but Gay Pride Day had more sunshine.  Both days saw a shower, but the shower that fell on Gay Pride Day (0.06") was more disruptive because it fell mid-afternoon during the parade (the first rain to fall during the parade in eleven years) while the shower on Father's Day (0.04") was shortly before daybreak. 
  • May and June had 12.28" of rain, making this the 11th wettest May/June combo on record. The 10 years with more all occurred in the years since 1948.  (Greatest amounts were 19.03" in 1989, 18.10" in 2013 and 17.69" in 1972.)
  • 2019 became the 36th year (since 1869) to have one or fewer days in the 90s thru June 30.  (The average number is four).  And of the fifteen years (excluding this year) that had one day in the 90s during this period the total number of such days for the year averaged eleven (with 1955 and 2015 having the most, 25 and 20, respectively).
  • Although the coolest reading of the month, 54°, was on 6/2, the coolest day of the month based on mean temperature was on 6/13, with a high/low of 65°/55° (eleven degrees below average).  This was the coolest mean temperature in more than four weeks.

 

Here are recaps of the previous three Junes:

2018

2017

2016

 


Junes With No 90-Degree Days

 

No (2)

 90 white on black background

 

As meteorological summer gets underway (June 1 thru Aug. 31) a typical June will see two or three days with highs in the 90s.  However, about once every five years no readings this hot occur; since 1869 there have been 31 years in which this has happened, most recently in 2016 (and at the other end of the spectrum, one June in four has five or more 90-degree days, the most recent being in 2021). 

 

Using 90° as the cut-off for hot conditions, rather than 88° or 89°, is a bit arbitrary (and doesn't take into account humidity levels).  Nonetheless, a June with no readings of 90+ is usually results in a cooler than average June.  For example, none of the ten coolest Junes had any high temperatures in the 90s.  Additionally, the five coolest summers started with a June with no 90-degree readings.  But not every June with no readings in the 90s is so cool.  In fact, the warmest June with no 90s was in 2014.  It was 1.1 degree warmer than average and ranks 39th warmest (out of 150).  And, surprisingly, one of the ten hottest summers, in 2016, started out with a 90s-free June.  Here are some other tidbits:

 

  • The most years in a row to have a June without a 90-degree reading is three (1926-1928).  Interestingly, this streak was bracketed by Junes with five or more 90-degree highs (1923 had eight, 1925 had nine, and 1929 and 1930 each had five).  The most consecutive years in which June had at least one day in the 90s is 12 (1997-2008).
  • Despite having no days in the 90s in June, four years had an above average number of 90-degree days: 1955 (25); 1977 (23); 2016 (22) and 1979 (19).  The average number of 90-degree days in years that had no 90-degree readings in June has been 10 (an average year, since 1930, has had 18; before that the average was just 11).
  • 11 of the 31 years with no June 90s had 90-degree readings prior to June 1, with 1977 having the most such days, three.
  • 89° was the hottest reading in 12 of the years in which June had no readings in the 90s.  Three of those years had their 89° reading on 6/30 (this excludes any June that had a high of 89° on 6/30 but on other dates in June as well).  One June had it occur on 6/1, another on 6/2.  And three years had their first 90-degree reading on 7/1.
  • The coolest warmest reading in June is 81°, occurring in 1903 (the coolest June on record).

 

Chart - coolest hottes temps in june

 

  • June 2016 and 1955 had the most readings between 85°-89°, ten.
  • Finally, daily low temperatures in the 70s are sometimes considered the counterpart of highs in the 90s.  Interestingly, 22 of the 31 Junes with no 90s had lows in the 70s (nine had some lows of 72° or warmer).  Seven of these Junes had three or more, with June 1869 having the most, seven.  The warmest low during a June with no 90s was 76° in 2014.

 

No heat_1514863491238.jpg_10369656_ver1.0_1280_720

 

 


Lackluster Heat Waves

 

Lackluster

 

This post was inspired by the rather tepid four-day heat wave of Aug. 5-8, 2018, which had an average high of 90.8° (with highs of 91°, 92°, 90° and 90°).  Of the close to 70 four-day heat waves that have occurred since 1870 (thru June 2023) only one, in July 1896, had a lower average high, 90.3°.  (2018's low-grade heat wave matched one in August 2009 and would be matched again in June 2021.)  On average, four-day heat waves have had an average high close to 94°.  (The hottest four-day heat wave on record took place in the summer of 2010, when the high temperature from July 4-7 was 99.5°.)

 

Chart- most tepid 4-day heat waves

However, the story changes when low temperatures are included in the analysis.  For example, August 2018's heat wave had an average low of 75.0°, which was 1.3 degrees warmer than the average four-day streak and warmer than two-thirds of the four-day heat waves examined.  When combined with the average high, the mean temperature ranked as 27th coolest - quite a difference in ranking compared to its average high alone.  (This follows the weather storyline of this century, whereby nighttime temperatures in New York are warming more than daytime temperatures.)

 

Chart - coolest 4-day heat waves based on mean temp

 

Finally, while the typical four-day heat wave had a 20-degree difference between its high and low, this August's was 15.8 degrees apart, which was the third smallest diurnal variation of the heat waves studied (a heat wave in July 1995 had the smallest, 14.7 degrees, while the second smallest was in July 1870).  


June 2018 Weather Recap for New York

 

Hello summer

 

Following an April that was significantly colder than average, by 3.6 degrees, and a May that was 4.5 degrees milder than average, June was "just right" as it was close to average, 0.2 degrees above average.  This was the closest to average for any month since June 2015 (0.2 below average).  However, despite the month being average overall, the first half was cooler (and drier) than average while the second half was warmer (five days had highs of 88° or hotter) and wetter (relative to the first half, since the amount that fell was average).  Here are a few other observations of interest: 

 

  • Father's Day had a high of 91°, which was 37 degrees hotter than Mother's Day (typical difference between the two holidays is thirteen degrees).  It joined Father's Day 2010 as having the greatest difference in high temperature from Mother's Day (going back to 1960).  Also, this was the first Father's Day with a high in the 90s in twelve years (and the seventh since 1960).
  • The hottest day of the first half of the year occurred on the last day of the period as the high reached 93° on 6/30. (The second half of the year began with a high of 96° on 7/1).
  • Rainfall was below average, 3.11" vs. a norm of 4.41".  Three-fourths of this amount fell in the last two weeks of the month.  And much of it, 1.36", fell on 6/28, highlighted by the downpour during the evening rush hour, which saw 0.93" pour down in about an hour.  This storm brought to mind the severe thunderstorm of 5/15 that snarled rush hour traffic.  However, despite producing less rain (0.58") it was characterized by destructive winds that killed five people who were struck by falling trees.
  • June was the closest to average a month has been since June 2015, which was 0.2 degrees below average.  Of the twelve months that have been 0.2 degrees or closer to average since 2000, five of them have been in June.

 

Chart - Months Closest to Average

 

June june
 

 

 


Comparing High Temperatures on Mother's Day and Father's Day

 

Fathers day and mothers day

 

Since Father's Day is about five weeks later than Mother's Day its high temperature is, on average, about thirteen degrees warmer (82° vs. 69°).  However, in 2018 there was a huge disparity in the temperatures as Father's Day had a sizzling high of 91° while Mother's Day's was only 54°.  This 37-degree difference tied 2010 for the greatest difference in temperature between the two holidays (and there was a 36-degree difference in 1994).  However, not every Father's Day has been warmer.  Since 1960 there have been eight Mother's Days with warmer highs (most recently in 2014), with the greatest difference being 28 degrees in 1970.  And sometimes the two holidays have similar readings; for example, in 2000 and 1974 they had the same high temperature.

 

Mothers Day Fathers Day

 

 


June 2017 Weather Recap: A Cool & Dry Start, Followed by Warm & Wet Second Half

 

Watermelon and sun

 

June 2017 was close to average temperature-wise (+0.6 degrees) and rainfall was close to average as well (4.76" vs. average of 4.41"), but as so often happens with averages, they masked the true "personality" of the month.  Specifically, the first nine days were six degrees cooler than average, and then the rest of the month was three degrees warmer than average; meanwhile, after less than half an inch of rain fell thru June 16, the remaining two weeks were on the rainy side, with more than four inches measured.

 

The highlights of the month occurred mostly during two eight-day periods.  The first, from June 6-13, pertained to temperature, with two days that were 10 degrees or more below average (highs in the 50s and 60s) quickly followed by three that were 10+ degrees above average (highs in the 90s).  The month's coolest and hottest days (based on daily mean temperature) were at the beginning and end of this eight-day period: a high/low of 58/52 on 6/6 (fourteen degrees below average) and 94/77 on 6/13 (fifteen degrees above average).  The second eight-day period was rain-related, most of which fell during three downpours of an inch or more on 6/17, 6/19 and 6/24; these periods of heavy rain each lasted two to three hours.   

 

Some additional observations:

  • The month's average high of 79.3° was right at the average, but the average low was 1.1 degree warmer than average.  This was largely due to ten days having lows of 70° or warmer, double the typical number - only four other years have had more.

 

70 Degree Lows in June

 

  • After three days in a row of 90-degree temperatures in May (5/17-19), the next twenty days saw no highs of 80° or warmer.  In fact, the first 80-degree day in June, on 6/9,  was the deepest into June with no 80-degree days since 2003, when it happened on 6/10.
  • Five days in a row had measurable rain from 6/2-6, but only 0.19" was measured, the smallest amount to fall during five consecutive days since March 1982.

 

Five Days of Rain

 

  • On average there are four or five days with highs of 88° or 89° before the sixth day in the 90s occurs, but this year there were no such days - the first time this has happened since 1995.  By contrast, last year had seven such days before the sixth high in the 90s occurred, 2015 had twelve, and 2014 had eight.
  • Four days in a row, 6/20-23, had a high of 83°.  Then, after a high of 84° on 6/24, there was another high of 83° on 6/25.
  • Father's Day (6/18) and Gay Pride Day (6/25) had similar conditions, with partly cloudy skies and highs/lows of 85/70 and 83/68, respectively.

 

Here are links to previous June recaps:

June 2016

June 2014

June 2013

 

 

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