Climatological Report (Seasonal)
Issued by NWS Portland, ME
Issued by NWS Portland, ME
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000 CXUS51 KGYX 020246 CLSPWM PWMCLSPWM 000 TTAA00 GYX 011907 CLIMATE REPORT NATIONAL WEATHER SERVICE GRAY ME 905 PM EST WED DEC 01 2021 ................................... ...THE PORTLAND ME CLIMATE SUMMARY FOR THE FALL SEASON, FROM 9/1/2021 TO 11/30/2021... 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 95 09/11/1983 09/07/1945 LOW 3 11/24/1989 HIGHEST 79 09/12 86 -7 86 09/04 LOWEST 18 11/30 16 2 16 11/19 AVG. MAXIMUM 60.9 59.7 1.2 61.3 AVG. MINIMUM 43.7 41.6 2.1 42.0 MEAN 52.3 50.6 1.7 51.7 DAYS MAX >= 90 0 0.5 -0.5 0 DAYS MAX <= 32 0 1.1 -1.1 0 DAYS MIN <= 32 19 24.8 -5.8 23 DAYS MIN <= 0 0 0.0 0.0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 24.18 2005 MINIMUM 4.88 1915 TOTALS 14.91 13.27 1.64 10.44 DAILY AVG. 0.16 0.15 0.01 0.11 DAYS >= .01 36 30.9 5.1 25 DAYS >= .10 25 18.9 6.1 15 DAYS >= .50 8 8.1 -0.1 6 DAYS >= 1.00 6 3.6 2.4 4 GREATEST 24 HR. TOTAL 4.13 10/30 TO 10/31 SNOWFALL (INCHES) RECORDS TOTAL 24.3 1921 TOTALS 0.1 2.5 -2.4 0.1 SINCE 7/1 0.1 2.5 -2.4 MM SNOWDEPTH AVG. T DAYS >= TRACE 3 1.6 1.4 6 DAYS >= 1.0 0 0.8 -0.8 0 GREATEST SNOW DEPTH T 11/27 24 HR TOTAL 0.1 11/27 DEGREE DAYS HEATING TOTAL 1162 1353 -191 1252 SINCE 7/1 1193 1377 -184 1267 COOLING TOTAL 31 45 -14 58 SINCE 1/1 521 446 75 681 ................................................................ WIND (MPH) AVERAGE WIND SPEED 6.6 HIGHEST WIND SPEED/DIRECTION 31/140 DATE 11/12 HIGHEST GUST SPEED/DIRECTION 44/130 DATE 11/12 SKY COVER AVERAGE SKY COVER 0.53 AVERAGE RH (PERCENT) 75 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 8 HEAVY RAIN 12 RAIN 20 LIGHT RAIN 38 FREEZING RAIN 0 LT FREEZING RAIN 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 3 FOG 41 FOG W/VIS <= 1/4 MILE 3 HAZE 2 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && UNSETTLED AND COOL CONDITIONS DOMINATED THE FIRST PART OF SEPTEMBER WITH THE REMNANTS OF HURRICANE IDA BRINGING HEAVY RAIN ON THE 1ST AND 2ND. TEMPERATURES THEN TRENDED ABOVE NORMAL THROUGH THE MIDDLE TO LATTER PART OF THE MONTH AS WARMER AND HUMID AIRMASSES CROSSED THE AREA WITH A COOL DOWN TO CLOSE OUT THE MONTH. AFTER 1.8 INCHES OF RAIN FROM THE REMNANTS OF IDA THE REST OF SEPTEMBER WAS CHARACTERIZED BY FREQUENT BOUTS OF LIGHT TO MODERATE RAIN WITHOUT ANY EXTENDED PERIODS OF DRY WEATHER. GOING INTO OCTOBER THE WEATHER PATTERN TURNED QUIET WITH TEMPERATURES RUNNING WELL ABOVE NORMAL THROUGH THE FIRST TWO WEEKS OF THE MONTH. DURING THIS PERIOD PRECIPITATION EVENTS WERE LIGHT AND SPARSE WITH SEVERAL CONSECUTIVE DAYS OF DRY WEATHER. AFTER THE MIDDLE OF OCTOBER THE PATTERN TURNED ACTIVE AND STAYED THAT WAY THROUGH THE END OF THE MONTH. DESPITE A RETURN TO ACTIVE WEATHER TEMPERATURES CONTINUED TO RUN ABOVE NORMAL LARGELY DUE TO WARM OVERNIGHT LOW TEMPERATURES. PORTLAND ONLY DROPPED TO THE FREEZING MARK ONCE DURING OCTOBER WITH A LOW OF 32 DEGREES ON THE 24TH MAKING THIS YEAR THE FOURTH LATEST FREEZE ON RECORD. TWO LOW PRESSURE SYSTEMS IMPACTED THE PORTLAND AREA DURING THE LAST WEEK OF OCTOBER WITH ONE SYSTEM BRINGING STRONG NORTHEAST WINDS TO 42 MPH ON THE 27TH. THE SECOND SYSTEM BROUGHT TORRENTIAL RAINFALL THE NIGHT OF THE 30TH INTO THE 31ST RESULTING IN THE GREATEST PRECIPITATION EVENT OF THE SEASON WITH A TOTAL OF 4.17 INCHES OF RAIN. SIMILAR TO OCTOBER, THE BEGINNING OF NOVEMBER BROUGHT A RETURN TO QUIET WEATHER AS PERSISTENT HIGH PRESSURE KEPT THE PORTLAND AREA DRY WITH WARM SUNNY DAYS AND COLD CLEAR NIGHTS. THE PATTERN TURNED MORE ACTIVE AGAIN TOWARDS THE MIDDLE OF NOVEMBER AS A BROAD AREA OF LOW PRESSURE TRACKED FROM THE GREAT LAKES THROUGH THE NORTHEAST. THIS SYSTEM BROUGHT 1.42 INCHES OF RAIN AND SOUTHEAST WIND GUSTS TO 44 MPH ON THE 12TH. THE PATTERN REMAINED RELATIVELY ACTIVE THROUGH THE END OF NOVEMBER WITH FRONTAL PASSAGES BRINGING SEVERAL TEMPERATURE SWINGS. AFTER A MILD THANKSGIVING, A COLD FRONT CROSSED THE AREA WITH LOW PRESSURE DEVELOPING IN THE GULF OF MAINE LEADING TO THE FIRST MEASURABLE SNOWFALL OF 0.1 INCH ON THE 27TH. THE AVERAGE TEMPERATURE WAS 52.3 DEGREES, WHICH WAS 1.7 DEGREES ABOVE NORMAL AND TIES WITH 2015 FOR THE THIRD WARMEST FALL ON RECORD. THE WARMEST FALL ON RECORD WAS 53.0 DEGREES IN 2017 AND 2011. THE COOLEST WAS 45.6 DEGREES IN 1976. THE FOLLOWING TABLE LISTS THE WARMEST FALLS ON RECORD AT PORTLAND. WARMEST AVERAGE TEMPERATURE IN FALL (SINCE 1940)... RANK AVE YEAR 1 53.0 2017 53.0 2011 3 52.3 2021 <=== 52.3 2015 5 51.9 2016 6 51.7 2020 7 51.5 2005 51.5 1961 9 51.3 1990 51.3 1970 THE FIRST FREEZE OF THIS FALL OCCURRED ON OCTOBER 24TH WHEN THE LOW TEMPERATURE DROPPED TO 32 DEGREES. THIS OCCURRED 10 DAYS LATER THAN THE NORMAL FIRST FREEZE DATE OF OCTOBER 15TH AND MAKES THIS THE FOURTH LATEST FREEZE ON RECORD. THE FOLLOWING TABLE LISTS THE LATEST FALL FREEZES ON RECORD. LATEST FIRST FALL FREEZE (SINCE 1940)... RANK DATE YEAR 1 NOV 3 2014 2 NOV 1 2017 3 OCT 25 2013 4 OCT 24 2021 <=== 5 OCT 21 2005 OCT 21 1990 OCT 21 1985 8 OCT 19 1970 9 OCT 18 2018 OCT 18 2008 A TOTAL OF 14.91 INCHES OF PRECIPITATION FELL, WHICH WAS 1.64 INCHES ABOVE NORMAL. THE HEAVIEST RAIN FELL ON OCTOBER 30-31 WHEN A TOTAL OF 4.17 INCHES WERE RECORDED. THE WETTEST FALL ON RECORD WAS 24.18 INCHES IN 2005. THE DRIEST WAS IN 1915 WITH 4.88 INCHES. ONLY 0.1 INCHES OF SNOW FELL, WHICH WAS 2.4 INCHES BELOW NORMAL. SNOW IN FALL IS OFTEN HIT OR MISS. IN 141 YEARS OF RECORDS THERE HAVE BEEN 4 YEARS WITH NO SNOW IN FALL, MOST RECENTLY IN 2006. AN ADDITIONAL 30 YEARS RECORDED ONLY A TRACE OF SNOWFALL, MOST RECENTLY IN 2015. THE SNOWIEST FALL WAS IN 1921 WHEN 24.3 INCHES FELL. THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN FALL 2021... DATE RECORD PREVIOUS SEP 9 4 - SMALLEST TEMPERATURE RANGE 4 IN 1946 (TIED) SEP 24 63 - WARMEST LOW TEMPERATURE 62 IN 1959 OCT 3 4 - SMALLEST TEMPERATURE RANGE 4 IN 1951 (TIED) OCT 25 4 - SMALLEST TEMPERATURE RANGE 4 IN 1972 (TIED) OCT 26 6 - SMALLEST TEMPERATURE RANGE 6 IN 1981, 1962 (TIED) OCT 30 2.78 - GREATEST PRECIPITATION 2.30 IN 1886 $$ SCHROETER