Climatological Report (Seasonal) Issued by NWS Portland, ME
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CXUS51 KGYX 050410
CLSPWM
PWMCLSPWM 000
TTAA00 GYX 020934
CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAY ME
1210 AM EDT SUN SEP 05 2021
...................................
...THE PORTLAND ME CLIMATE SUMMARY FOR THE SUMMER SEASON, FROM
6/1/2021 TO 8/31/2021...
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1941 TO 2021 (FOR TEMPERATURES)
CLIMATE RECORD PERIOD: 1871 TO 2021 (FOR PRECIPITATION)
CLIMATE RECORD PERIOD: 1882 TO 2021 (FOR SNOWFALL)
WEATHER OBSERVED NORMAL DEPART LAST YEAR`S
VALUE DATE(S) VALUE FROM VALUE DATE(S)
NORMAL
................................................................
TEMPERATURE (F)
RECORD
HIGH 103 08/02/1975
LOW 33 08/31/1965
06/04/1944
HIGHEST 97 06/28 93 4 94 07/20
LOWEST 46 06/01 42 4 37 06/01
AVG. MAXIMUM 78.1 77.3 0.8 79.9
AVG. MINIMUM 59.9 58.6 1.3 61.1
MEAN 69.0 68.0 1.0 70.5
DAYS MAX >= 90 7 4.2 2.8 13
DAYS MAX <= 32 0 0.0 0.0 0
DAYS MIN <= 32 0 0.0 0.0 0
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 22.31 2009
MINIMUM 4.10 1999
TOTALS 12.58 11.15 1.43 7.96
DAILY AVG. 0.13 0.12 0.01 0.09
DAYS >= .01 33 31.9 1.1 27
DAYS >= .10 22 18.8 3.2 15
DAYS >= .50 10 6.7 3.3 4
DAYS >= 1.00 3 2.6 0.4 2
GREATEST
24 HR. TOTAL 2.34 07/08 TO 07/09
SNOWFALL (INCHES)
RECORDS
TOTAL 0.0
TOTALS 0.0 0.0 0.0 0.0
SINCE 7/1 0.0 0.0 0.0
SNOWDEPTH AVG. 0
DAYS >= TRACE 0 0.0 0.0 0
DAYS >= 1.0 0 0.0 0.0 0
GREATEST
SNOW DEPTH 0
24 HR TOTAL 0.0
DEGREE DAYS
HEATING TOTAL 75 115 -40 73
SINCE 7/1 31 21 10 15
COOLING TOTAL 474 390 84 605
SINCE 1/1 490 401 89 623
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WIND (MPH)
AVERAGE WIND SPEED 6.2
HIGHEST WIND SPEED/DIRECTION 25/140 DATE 06/30
HIGHEST GUST SPEED/DIRECTION 34/010 DATE 06/30
SKY COVER
AVERAGE SKY COVER 0.57
AVERAGE RH (PERCENT) 77
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 9 HEAVY RAIN 10
RAIN 12 LIGHT RAIN 42
FREEZING RAIN 0 LT FREEZING RAIN 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 FOG 47
FOG W/VIS <= 1/4 MILE 9 HAZE 7
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
&&
AFTER A COLD AND WET MEMORIAL DAY WEEKEND, A WARMING TREND BEGAN.
ONLY A WEEK INTO JUNE AND THE FIRST HEAT WAVE OF SUMMER HAD ARRIVED.
THE HOTTEST TEMPERATURE REACHED 94 ON JUNE 7. ALTHOUGH A FEW COLD
FRONTS BROUGHT SOME RELIEF FROM THE HEAT, THE WARM AND HUMID AIR
KEPT RETURNING. ANOTHER HEAT WAVE ARRIVED FOR THE END OF JUNE WITH
THE TEMPERATURE TOPPING 95 DEGREES FOR 3 STRAIGHT DAYS. THE HOTTEST
WAS 97 ON JUNE 28. THE LOW OF 75 ON JUNE 29 WAS THE WARMEST LOW
TEMPERATURE ON RECORD FOR THE MONTH OF JUNE. THE MULTIPLE BOUTS OF
SUMMER HEAT SECURED JUNE 2021 AS THE HOTTEST ON RECORD AT PORTLAND,
AND IT WAS ONE OF THE DRIEST AS WELL. BUT JUST AS THE SUMMER`S NEXT
HOLIDAY WEEKEND ARRIVED, THE WEATHER TURNED COLD AND RAINY AGAIN.
NEARLY 2 INCHES OF RAIN FELL OVER THE INDEPENDENCE DAY WEEKEND WITH
THE TEMPERATURE BARELY RISING INTO THE 60S. AFTER A BRIEF WARM UP,
THE REMNANTS OF TROPICAL STORM ELSA TRACKED NEAR THE AREA, DROPPING
MORE THAN 2 INCHES OF RAIN ON JULY 9. A SERIES OF COLD FRONTS
BROUGHT COOL CANADIAN AIR MASSES INTO THE REGION FOR MOST OF THE
MONTH. FREQUENT ROUNDS OF SHOWERS AND THUNDERSTORMS ACCOMPANIED THE
FRONTAL PASSAGES AS WELL. THE UNUSUALLY COOL AND WET MIDSUMMER
CONDITIONS BROUGHT THE 2ND WETTEST JULY ON RECORD AND THE COOLEST IN
MORE THAN A DECADE. THIS PATTERN BEGAN TO CHANGE IN AUGUST WITH WARM
AND HUMID CONDITIONS RETURNING. THE FIRST HOT STRETCH PEAKED AT 90
ON AUGUST 14. THE REMNANTS OF TROPICAL STORM FRED BROUGHT NEARLY AN
INCH OF RAIN ON AUGUST 19, WITH TROPICAL STORM HENRI MAKING LANDFALL
IN SOUTHERN NEW ENGLAND JUST A FEW DAYS LATER ON AUGUST 22. ASIDE
FROM THESE TWO SYSTEMS, VERY LITTLE RAIN FELL WITH HOT AND HUMID
CONDITIONS RETURNING AGAIN FOR THE END OF AUGUST.
THE AVERAGE TEMPERATURE WAS 69.0 DEGREES WHICH WAS 1.0 DEGREES ABOVE
NORMAL. ALTHOUGH A FULL 1.5 DEGREES COOLER THAN LAST SUMMER, IT WAS
STILL THE SECOND WARMEST SUMMER ON RECORD. THE SUMMER HAD TWO MONTHS
OF HOT AND HUMID WEATHER WITH THE COOL JULY SANDWICHED IN BETWEEN.
THE HOTTEST SUMMER WAS IN 2020 WHEN THE AVERAGE TEMPERATURE WAS 70.5
DEGREES. THE COOLEST WAS 63.7 DEGREES IN 1964. THE FOLLOWING TABLE
LISTS THE WARMEST SUMMERS ON RECORD AT PORTLAND.
WARMEST AVERAGE TEMPERATURE IN SUMMER (SINCE 1940)...
RANK AVE YEAR
1 70.5 2020
2 69.0 2021 <===
3 68.9 2018
68.9 2016
5 68.7 2010
68.7 1988
7 68.6 1999
8 68.5 2012
68.5 1991
68.5 1973
A TOTAL OF 12.58 INCHES OF PRECIPITATION FELL WHICH WAS 1.43 INCHES
ABOVE NORMAL. THREE QUARTERS OF THIS RAIN FELL IN THE MONTH OF JULY
AS APART FROM THIS VERY RAINY MONTH, THE REST OF THE SUMMER WAS
QUITE DRY. THE HEAVIEST RAIN WAS ON JULY 8 AND 9 WHEN 2.60 INCHES OF
RAIN FELL. THE WETTEST SUMMER WAS IN 2009 WHEN 22.31 INCHES FELL.
THE DRIEST WAS IN 1999 WITH ONLY 4.10 INCHES.
THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN SUMMER 2021...
DATE RECORD PREVIOUS
JUN 6 68 - WARMEST LOW TEMPERATURE 63 IN 2020
JUN 6 78 - WARMEST AVERAGE TEMPERATURE 73 IN 1963
JUN 7 64 - WARMEST LOW TEMPERATURE 63 IN 1999
JUN 7 79 - WARMEST AVERAGE TEMPERATURE 79 IN 1999 (TIED)
JUN 8 92 - WARMEST HIGH TEMPERATURE 90 IN 1999 AND OTHERS
JUN 8 72 - WARMEST LOW TEMPERATURE 60 IN 2014 AND OTHERS
JUN 8 82 - WARMEST AVERAGE TEMPERATURE 75 IN 1941
JUN 29 96 - WARMEST HIGH TEMPERATURE 96 IN 1944 (TIED)
JUN 29 75 - WARMEST LOW TEMPERATURE 68 IN 1999 AND OTHERS
JUN 29 86 - WARMEST AVERAGE TEMPERATURE 82 IN 1944
JUN 30 71 - WARMEST LOW TEMPERATURE 65 IN 2018 AND OTHERS
JUN 30 83 - WARMEST AVERAGE TEMPERATURE 79 IN 1971
JUL 18 1.17 - GREATEST PRECIPITATION 1.12 IN 2008
AUG 9 4 - SMALLEST TEMPERATURE RANGE 5 IN 2013 AND OTHERS
AUG 13 72 - WARMEST LOW TEMPERATURE 72 IN 1944 (TIED)
AUG 20 68 - WARMEST LOW TEMPERATURE 67 IN 2015
AUG 22 5 - SMALLEST TEMPERATURE RANGE 5 IN 1966 (TIED)
AUG 23 3 - SMALLEST TEMPERATURE RANGE 5 IN 2015
AUG 28 9 - SMALLEST TEMPERATURE RANGE 9 IN 2011 AND OTHERS (TIED)
$$
KIMBLE