Climatological Report (Seasonal)
Issued by NWS Portland, ME
Issued by NWS Portland, ME
Versions:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
000 CXUS51 KGYX 080935 CLSPWM PWMCLMPWM 000 TTAA00 KGYX 020027 CLIMATE REPORT NATIONAL WEATHER SERVICE GRAY ME 435 AM EST TUE DEC 8 2020 ................................... ...THE PORTLAND ME CLIMATE SUMMARY FOR THE FALL SEASON, FROM 9/1/2020 TO 11/30/2020... CLIMATE NORMAL PERIOD 1981 TO 2010 CLIMATE RECORD PERIOD 1941 TO 2020 (FOR TEMPERATURES) CLIMATE RECORD PERIOD 1871 TO 2020 (FOR PRECIPITATION) CLIMATE RECORD PERIOD 1882 TO 2020 (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 86 09/04 86 0 89 09/23 LOWEST 16 11/19 16 0 13 11/14 AVG. MAXIMUM 61.3 58.9 2.4 58.3 AVG. MINIMUM 42.0 40.0 2.0 40.8 MEAN 51.7 49.4 2.3 49.5 DAYS MAX >= 90 0 0.3 -0.3 0 DAYS MAX <= 32 0 1.0 -1.0 2 DAYS MIN <= 32 23 26.1 -3.1 23 DAYS MIN <= 0 0 0.0 0.0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 24.18 2005 MINIMUM 4.88 1915 TOTALS 10.44 13.49 -3.05 9.61 DAILY AVG. 0.11 0.15 -0.04 0.10 DAYS >= .01 25 30.9 -5.9 33 DAYS >= .10 15 19.4 -4.4 15 DAYS >= .50 6 8.1 -2.1 6 DAYS >= 1.00 4 3.6 0.4 3 GREATEST 24 HR. TOTAL 2.32 11/23 SNOWFALL (INCHES) RECORDS TOTAL 24.3 1921 TOTALS 0.1 1.9 -1.8 0.3 SINCE 7/1 0.1 1.9 -1.8 0.3 SNOWDEPTH AVG. 0 DAYS >= TRACE 6 1.5 4.5 4 DAYS >= 1.0 0 0.7 -0.7 0 GREATEST SNOW DEPTH 0 24 HR TOTAL 0.1 11/25 DEGREE_DAYS HEATING TOTAL 1252 1446 -194 1422 SINCE 7/1 1267 1491 -224 1435 COOLING TOTAL 58 31 27 38 SINCE 1/1 681 359 322 474 ................................................................. WIND (MPH) AVERAGE WIND SPEED 6.8 HIGHEST WIND SPEED/DIRECTION 37/150 DATE 11/30 HIGHEST GUST SPEED/DIRECTION 53/190 DATE 09/30 SKY COVER AVERAGE SKY COVER 0.50 AVERAGE RH (PERCENT) 73 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && DROUGHT WHICH BEGAN IN SPRING AND CONTINUED THROUGH SUMMER INTENSIFIED AGAIN IN SEPTEMBER. A SERIES OF HIGH PRESSURE SYSTEMS BROUGHT DRY CONTINENTAL AIR MASSES INTO THE REGION FOR THE FIRST 4 WEEKS OF FALL. COOL HIGH PRESSURE REMAINED STATIONARY OVER THE REGION FOR THE MIDDLE OF SEPTEMBER WITH MANY COOL DAYS AND EVEN COOLER NIGHTS. THE TEMPERATURE GOT ALL THE WAY DOWN TO 34 DEGREES ON SEPTEMBER 21. BUT WARMER CONDITIONS RETURNED IN LATE SEPTEMBER WITH A FEW 80 DEGREE DAYS. FINALLY SOME RAIN FELL ON SEPTEMBER 30, ALTHOUGH IT WAS ACCOMPANIED BY WINDS GUSTING TO 53 MPH. A SERIES OF FRONTAL BOUNDARIES BROUGHT ALTERNATING WARMER AND COOLER CONDITIONS AS THE STORM TRACK GRADUALLY SHIFTED CLOSER TOWARD NEW ENGLAND IN OCTOBER. THE FIRST FREEZE OF THE SEASON CAME ON OCTOBER 9, BUT IT WARMED ALL THE WAY TO 78 DEGREES THE NEXT DAY. MORE FREQUENT STORM SYSTEMS BROUGHT RAINFALL THAT HELPED TO EASE THE DROUGHT. THE FIRST SIGNIFICANT STORM BROUGHT NEARLY 2 INCHES ON OCTOBER 13, WITH ANOTHER INCH FALLING ON OCTOBER 17. CONDITIONS TURNED COOLER IN LATE OCTOBER WITH THE FIRST SNOWFLAKES OF THE SEASON OBSERVED JUST BEFORE HALLOWEEN. THIS COOL WEATHER ONLY LASTED A COUPLE OF WEEKS BEFORE PORTLAND SAW ONE OF ITS MOST INTENSE AND LONG LASTING LATE SEASON WARM SPELLS ON RECORD. BEGINNING ON NOVEMBER 5, PORTLAND SAW THE TEMPERATURE TOP 60 DEGREES ON 7 OUT OF 8 DAYS, INCLUDING 3 DAYS TOPPING 70 DEGREES. THE WARMEST WAS 74 ON NOVEMBER 7, TYING AS THE WARMEST TEMPERATURE ON RECORD FOR THE MONTH OF NOVEMBER. A COLD FRONT ON NOVEMBER 12 BROUGHT THIS STRETCH OF UNUSUALLY WARM WEATHER TO AN END, WITH THE MORE FREQUENT STORMINESS RETURNING. THE FIRST STORM BROUGHT MORE WIND THAN RAIN ON NOVEMBER 15 AND 16 WHEN WINDS GUSTED TO 50 MPH. ANOTHER STORM ON NOVEMBER 23 BROUGHT MORE THAN 2 INCHES OF RAIN. LIGHT SNOW FELL THE DAY BEFORE THANKSGIVING WITH ONLY 0.1 INCH ACCUMULATING ON NOVEMBER 25. ONE MORE SIGNIFICANT STORM BROUGHT NEARLY AN INCH AND A HALF OF RAIN ON NOVEMBER 30 ALONG WITH 52 MPH WINDS. THE AVERAGE TEMPERATURE FOR THE FALL WAS 51.7 DEGREES WHICH WAS 2.3 DEGREES ABOVE NORMAL AND THE 5TH WARMEST FALL ON RECORD. THE WARMEST FALL WAS IN 2017 AND 2011 WHEN THE AVERAGE TEMPERATURE WAS 53.0 DEGREES. THE COOLEST WAS 47.4 DEGREES IN 1965. 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 2015 4 51.9 2016 5 51.7 2020 <=== 6 51.5 2005 51.5 1961 8 51.3 1990 51.3 1970 10 51.2 2014 A TOTAL OF 10.44 INCHES OF PRECIPITATION FELL WHICH WAS 3.05 INCHES BELOW NORMAL. THE HEAVIEST RAIN FELL ON NOVEMBER 23 WHEN 2.32 INCHES WAS MEASURED. THE DRIEST NOVEMBER WAS IN 1910 WHEN ONLY 6.01 INCHES WAS RECORDED. THE WETTEST WAS IN 2005 WITH 24.18 INCHES. ONLY 0.1 INCHES OF SNOW FELL WHICH WAS 1.8 INCHES BELOW NORMAL. ALL OF THIS FELL ON NOVEMBER 25. SNOW IN FALL IS OFTEN HIT OR MISS. IN 140 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 2020... DATE RECORD PREVIOUS SEP 10 66 - WARMEST LOW TEMPERATURE 66 IN 1999 (TIED) SEP 28 65 - WARMEST LOW TEMPERATURE 62 IN 2008 SEP 28 68 - WARMEST AVERAGE TEMPERATURE 67 IN 2007, 1959 SEP 29 63 - WARMEST LOW TEMPERATURE 63 IN 2015 (TIED) OCT 13 1.96 - GREATEST PRECIPITATION 1.69 IN 1990 OCT 30 38 - COOLEST HIGH TEMPERATURE 40 IN 1966 OCT 31 33 - COOLEST AVERAGE TEMPERATURE 33 IN 1966 (TIED) NOV 6 71 - WARMEST HIGH TEMPERATURE 69 IN 2015 NOV 6 61 - WARMEST AVERAGE TEMPERATURE 60 IN 2015 NOV 7 74 - WARMEST HIGH TEMPERATURE 65 IN 2015 NOV 7 62 - WARMEST AVERAGE TEMPERATURE 58 IN 2008 NOV 10 72 - WARMEST HIGH TEMPERATURE 64 IN 2009 NOV 10 36 - GREATEST TEMPERATURE RANGE 32 IN 1995, 1949 NOV 11 69 - WARMEST HIGH TEMPERATURE 65 IN 2002 NOV 11 53 - WARMEST LOW TEMPERATURE 52 IN 2002 NOV 11 61 - WARMEST AVERAGE TEMPERATURE 59 IN 2002 NOV 12 65 - WARMEST HIGH TEMPERATURE 65 IN 1982 (TIED) NOV 18 25 - COOLEST AVERAGE TEMPERATURE 25 IN 1959 (TIED) NOV 23 2.32 - GREATEST PRECIPITATION 2.08 IN 1874 $$ KIMBLE