Climatological Report (Seasonal) Issued by NWS Portland, ME
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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