Climatological Report (Seasonal)
Issued by NWS Portland, ME
Issued by NWS Portland, ME
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000 CXUS51 KGYX 051834 CLSPWM PWMCLMPWM 000 TTAA00 KGYX 041800 CLIMATE REPORT NATIONAL WEATHER SERVICE GRAY ME 134 PM EST THU DEC 5 2019 ................................... ...THE PORTLAND ME CLIMATE SUMMARY FOR THE FALL SEASON, FROM 9/1/2019 TO 11/30/2019... CLIMATE NORMAL PERIOD 1981 TO 2010 CLIMATE RECORD PERIOD 1941 TO 2019 /FOR TEMPERATURES/ CLIMATE RECORD PERIOD 1871 TO 2019 /FOR PRECIPITATION/ CLIMATE RECORD PERIOD 1882 TO 2019 /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 89 09/23 86 3 92 09/06 LOWEST 13 11/14 16 -3 4 11/23 AVG. MAXIMUM 58.3 58.9 -0.6 56.9 AVG. MINIMUM 40.8 40.0 0.8 41.1 MEAN 49.5 49.4 0.1 49.0 DAYS MAX >= 90 0 0.3 -0.3 2 DAYS MAX <= 32 2 1.0 1.0 3 DAYS MIN <= 32 23 26.1 -3.1 24 DAYS MIN <= 0 0 0.0 0.0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 24.18 2005 MINIMUM 4.88 1915 TOTALS 9.61 13.49 -3.88 20.98 DAILY AVG. 0.10 0.15 -0.05 0.23 DAYS >= .01 33 30.9 2.1 40 DAYS >= .10 15 19.4 -4.4 29 DAYS >= .50 6 8.1 -2.1 17 DAYS >= 1.00 3 3.6 -0.6 7 GREATEST 24 HR. TOTAL 1.74 10/23 SNOWFALL (INCHES) RECORDS TOTAL 24.3 1921 TOTALS 0.3 1.9 -1.6 15.9 SINCE 7/1 0.3 1.9 -1.6 15.9 SNOWDEPTH AVG. 0 DAYS >= TRACE 4 1.5 2.5 11 DAYS >= 1.0 0 0.7 -0.7 3 GREATEST SNOW DEPTH 0 24 HR TOTAL 0.3 11/12 DEGREE_DAYS HEATING TOTAL 1422 1446 -24 1527 SINCE 7/1 1435 1491 -56 1533 COOLING TOTAL 38 31 7 89 SINCE 1/1 474 359 115 585 ................................................................. WIND (MPH) AVERAGE WIND SPEED 7.3 HIGHEST WIND SPEED/DIRECTION 46/090 DATE 10/17 HIGHEST GUST SPEED/DIRECTION 62/090 DATE 10/17 SKY COVER AVERAGE SKY COVER 0.50 AVERAGE RH (PERCENT) 69 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && THE FALL BEGAN WITH A SERIES OF COOL, DRY AIR MASSES MOVING OUT OF CANADA. THIS BROUGHT MANY COOL DAYS AND EVEN COOLER NIGHTS. THE COOLEST TEMPERATURE OF THIS STRETCH WAS 38 DEGREES ON SEPTEMBER 19. BUT JUST AS THE COOL WEATHER REACHED ITS MINIMUM, WARM, SUMMER-LIKE WEATHER MADE A COME BACK. HOT WEATHER BUILDING OVER THE SOUTHEAST US SPILLED INTO NEW ENGLAND AND PORTLAND SAW THE TEMPERATURE TOP 80 DEGREES FOR THE NEXT 5 DAYS. THE WARMEST TEMPERATURE WAS 89 DEGREES ON SEPTEMBER 23. AFTER THIS LATE SEASON WARM UP, THE TREND OF COOL, DRY AIR MASSES MOVING OUT OF CANADA PICKED BACK UP AGAIN FOR THE NEXT FEW WEEKS. THE COOLEST TEMPERATURE OF THIS STRETCH WAS 32 DEGREES ON OCTOBER 5, THE EARLIEST FALL FREEZE AT PORTLAND SINCE 2000. SOON THE WEATHER PATTERN BEGAN TO CHANGE. A LARGE TROUGH OF LOW PRESSURE DEVELOPED OVER THE CENTER OF THE COUNTRY WITH NEW ENGLAND ON THE EAST SIDE OF THIS TROUGH. THIS MEANT WARM, MOIST AIR WAS FREQUENTLY FUNNELED INTO THE AREA FROM THE SOUTHWEST ALONG WITH CLOUDS AND FREQUENT LIGHT RAINFALL. A FEW COLD FRONTS WOULD OCCASIONALLY MAKE THEIR WAY IN FROM THE WEST, BUT THE CLOUDS AND MOISTURE WOULD QUICKLY RETURN. THIS HAD THE EFFECT OF BRINGING MANY COOL DAYS AND WARM NIGHTS. SOON THE REGION BEGAN TO BE AFFECTED BY A SERIES OF MORE INTENSE STORM SYSTEMS. THE FIRST AND MOST SIGNIFICANT CAME ON OCTOBER 17 WITH MORE THAN AN INCH OF RAIN AND 62 MPH WINDS. THESE WINDS CAUSED DAMAGE AND POWER OUTAGES IN THE AREA. THE NEXT FEW STORMS BROUGHT MORE THAN 2 INCHES OF RAIN ON OCTOBER 22 AND 23 AND ANOTHER INCH ON OCTOBER 27. THE LAST IN THE SERIES OF STORMS BEGAN ON HALLOWEEN AND WHILE IT DIDN`T BRING AS MUCH RAINFALL IT BROUGHT ANOTHER ROUND OF STRONG WINDS, THIS TIME TOPPING OUT AT 49 MPH ON NOVEMBER 1. THE LARGE TROUGH OF LOW PRESSURE OVER THE CENTRAL US BEGAN TO SHIFT MORE INTO NEW ENGLAND IN NOVEMBER, EVENTUALLY EXPOSING THE AREA TO SOME VERY COLD ARCTIC AIR. THE MOST INTENSE PERIOD OF COLD WEATHER BEGAN ON NOVEMBER 7 AND THE TEMPERATURE FOR MOST OF THE NEXT TWO WEEKS WAS 10 TO 15 DEGREES BELOW NORMAL. LIGHT SNOW, SLEET, AND FREEZING RAIN FELL ON NOVEMBER 12 AND STUCK AROUND FOR SEVERAL DAYS AS THE TEMPERATURE REMAINED BELOW FREEZING. THE COLDEST TEMPERATURE WAS ON NOVEMBER 14 WHEN IT BOTTOMED OUT AT 13 DEGREES. GRADUALLY THE TEMPERATURE DRIFTED BACK TOWARD NORMAL ALLOWING THE PRECIPITATION IN THE LAST FEW STORM SYSTEMS TO FALL MOSTLY AS RAINFALL. THE AVERAGE TEMPERATURE FOR THE FALL WAS 49.5 DEGREES WHICH WAS 0.1 DEGREES ABOVE NORMAL. THE WARMEST FALL WAS IN 2017 WHEN THE AVERAGE TEMPERATURE WAS 53.0 DEGREES. THE COOLEST WAS 45.6 DEGREES IN 1976. A TOTAL OF 9.61 INCHES OF PRECIPITATION FELL WHICH WAS 3.88 INCHES BELOW NORMAL. THE HEAVIEST PRECIPITATION FELL ON OCTOBER 22 AND 23 WHEN 2.05 INCHES OF RAIN WAS RECORDED. THE DRIEST FALL WAS IN 1915 WHEN ONLY 4.88 INCHES OF PRECIPITATION WAS RECORDED. THE WETTEST WAS IN 2005 WHEN 24.18 INCHES FELL. ONLY 0.3 INCHES OF SNOW FELL WHICH WAS 1.6 INCHES BELOW NORMAL. ALL OF THIS SNOW FELL ON NOVEMBER 12. SNOWFALL IN THE FALL IS VARIABLE AND ALMOST ALWAYS FALLS IN THE LAST PART OF NOVEMBER AS THE SNOW SEASON IS JUST BEGINNING. THE SNOWIEST FALL WAS IN 1921 WHEN 24.3 INCHES WAS MEASURED. THERE HAVE BEEN 4 FALLS WITH NO SNOW RECORDED, MOST RECENTLY IN 2006. THERE HAVE BEEN AN ADDITIONAL 30 FALLS WHICH RECORDED ONLY A TRACE OF SNOWFALL. THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN FALL 2019... DATE RECORD PREVIOUS SEP 20 39 - GREATEST TEMPERATURE RANGE 36 IN 1994 & OTHERS SEP 23 89 - WARMEST TEMPERATURE 86 IN 1941 SEP 23 68 - WARMEST LOW TEMPERATURE 68 IN 1970 (TIED) SEP 23 79 - WARMEST AVERAGE TEMPERATURE 77 IN 1970 OCT 23 1.74 - GREATEST PRECIPITATION 1.64 IN 1970 & 1956 OCT 31 55 - WARMEST LOW TEMPERATURE 53 IN 2004 NOV 8 36 - COOLEST HIGH TEMPERATURE 36 IN 1992 & 1959 (TIED) NOV 12 33 - COOLEST HIGH TEMPERATURE 36 IN 2004 & 1985 NOV 12 26 - COLDEST AVERAGE TEMPERATURE 28 IN 1942 NOV 13 27 - COLDEST HIGH TEMPERATURE 33 IN 1990 NOV 13 21 - COLDEST AVERAGE TEMPERATURE 25 IN 1941 NOV 20 5 - SMALLEST TEMPERATURE RANGE 6 IN 1998 & 1981 $$ KIMBLE