Climatological Report (Seasonal)
Issued by NWS Portland, ME

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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


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