Climatological Report (Seasonal)
Issued by NWS Portland, ME
Issued by NWS Portland, ME
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000 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 ................................................................ 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