Climatological Report (Seasonal)
Issued by NWS Portland, ME

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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


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