Climatological Report (Seasonal)
Issued by NWS Portland, ME

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CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAY ME
648 PM EDT FRI JUN 04 2021

...................................

...THE PORTLAND ME CLIMATE SUMMARY FOR THE SPRING SEASON,
FROM 3/1/2021 TO 5/31/2021...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1941 TO 2021 (FOR TEMPERATURES)
CLIMATE RECORD PERIOD: 1871 TO 2021 (FOR PRECIPITATION)
CLIMATE RECORD PERIOD: 1882 TO 2021 (FOR SNOWFALL)

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             94   05/31/1987
 LOW             -21   03/04/1950
HIGHEST           88   05/26         85       3       86  05/28
LOWEST             7   03/02          6       1       16  03/01
AVG. MAXIMUM    55.3               53.5     1.8     54.4
AVG. MINIMUM    35.7               35.6     0.1     36.1
MEAN            45.5               44.5     1.0     45.3
DAYS MAX >= 90     0                0.4    -0.4        0
DAYS MAX <= 32     3                4.2    -1.2        0
DAYS MIN <= 32    28               37.2    -9.2       32
DAYS MIN <= 0      0                0.4    -0.4        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM       22.55   1983
 MINIMUM        4.23   1965
TOTALS          8.50              12.16   -3.66    10.79
DAILY AVG.      0.09               0.13   -0.04     0.12
DAYS >= .01       28               34.9    -6.9       30
DAYS >= .10       15               21.1    -6.1       20
DAYS >= .50        6                8.2    -2.2        8
DAYS >= 1.00       2                2.7    -0.7        3
GREATEST
 24 HR. TOTAL   1.48   03/28 TO 03/29

SNOWFALL (INCHES)
RECORDS
 TOTAL          61.5   1906
TOTALS           0.4               16.4   -16.0      9.1
SINCE 7/1       41.3               68.7   -27.4     66.0
SNOWDEPTH AVG.     0
DAYS >= TRACE      9                6.4     2.6       12
DAYS >= 1.0        0                3.5    -3.5        2
GREATEST
 SNOW DEPTH        3   03/01
 24 HR TOTAL     0.3

DEGREE DAYS
HEATING TOTAL   1788               1894    -106     1809
 SINCE 7/1      6338               6705    -367     6389
COOLING TOTAL     16                 11       5       18
 SINCE 1/1        16                 11       5       18
................................................................

WIND (MPH)
AVERAGE WIND SPEED              8.6
HIGHEST WIND SPEED/DIRECTION    40/300    DATE  03/02
HIGHEST GUST SPEED/DIRECTION    44/270    DATE  05/26

SKY COVER
AVERAGE SKY COVER           0.51

AVERAGE RH (PERCENT)     65

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              2     HEAVY RAIN                 4
RAIN                     12     LIGHT RAIN                33
FREEZING RAIN             0     LT FREEZING RAIN           0
HEAVY SNOW                0     SNOW                       1
LIGHT SNOW                6     FOG                       25
FOG W/VIS <= 1/4 MILE     5     HAZE                       4

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

&&

SPRING BEGAN WITH A STRONG COLD FRONT WHICH BROUGHT COLD AND WINDY
CONDITIONS. A STRETCH OF MILD WEATHER IN MID MARCH ALLOWED THE LAST
OF THE WINTER SNOW DEPTH TO MELT BY THE MORNING OF MARCH 14. ANOTHER
STRONG COLD FRONT BLEW THROUGH SHIFTING TEMPERATURES WELL BELOW
FREEZING AGAIN WITH WINDS GUSTING TO 50 MPH. THIS WAS THE LAST
INTENSE ARCTIC BLAST OF THE SEASON AND IT DIDN`T LAST LONG. MILD
WEATHER RETURNED JUST A FEW DAYS LATER. SEVERAL STORM SYSTEMS
BROUGHT RAIN AT THE END OF MARCH AND BEGINNING OF APRIL WITH
MEASURABLE RAIN FALLING ON 6 OUT OF 8 DAYS. THE HEAVIEST WAS ON
MARCH 28 WHEN NEARLY 1.5 INCHES WAS MEASURED. ANOTHER ROUND OF
STRONG WIND OCCURRED BEHIND THIS STORM WITH GUSTS AS HIGH AS 53 MPH
ON MARCH 28. THE WEATHER TURNED DRY AGAIN FOR THE FIRST TWO WEEKS OF
APRIL WITH SOME MILD TEMPERATURES OBSERVED AS WELL. LOW PRESSURE
TRACKING NEAR THE AREA BROUGHT RAIN AND WET SNOWFALL ON APRIL 16
WITH SOME MINOR ACCUMULATION. THIS WAS THE START OF ANOTHER RAINIER
STRETCH OF WEATHER WHICH SAW FREQUENT FRONTAL SYSTEMS BRING
ALTERNATING WARMER AND COOLER WEATHER AND OCCASIONAL RAINFALL. THIS
LASTED INTO THE FIRST WEEK OF MAY BEFORE THINGS BEGAN TO DRY OUT YET
AGAIN. THE LAST FREEZE OF THE SPRING WAS ON APRIL 22, A FEW DAYS
EARLIER THAN NORMAL AND ALSO THE 8TH EARLIEST ON RECORD. PORTLAND
SAW VERY LITTLE RAINFALL FOR ABOUT TWO WEEKS DURING THE MIDDLE OF
MAY WITH TEMPERATURES GRADUALLY WARMING INTO THE 70S AND EVEN INTO
THE 80S. THIS LASTED UNTIL A COLD FRONT CAME THROUGH LATE IN THE
MONTH. THIS WAS ACCOMPANIED BY THUNDERSTORMS PRODUCING GUSTY WINDS
ON MAY 28TH. MEMORIAL DAY WEEKEND WAS A COOL AND WET ONE WITH
SEVERAL DAYS OF RAIN OBSERVED.

THE AVERAGE TEMPERATURE WAS 45.5 DEGREES WHICH WAS 1.0 DEGREES ABOVE
NORMAL AND THE 5TH WARMEST SPRING ON RECORD. THE WARMEST SPRING WAS
IN 2010 WHEN THE AVERAGE TEMPERATURE WAS 48.9 DEGREES. THE COOLEST
WAS 37.9 DEGREES IN 1956. THE FOLLOWING TABLE LISTS THE WARMEST
SPRINGS ON RECORD AT PORTLAND.

WARMEST AVERAGE TEMPERATURE IN SPRING (SINCE 1941)...
RANK  TEMP  YEAR
1     48.8  2010
2     48.2  2012
3     47.0  1991
4     46.4  1998
5     45.5  2021  <===
6     45.4  1981
7     45.3  2020
8     45.2  1942
9     45.1  2016
      45.1  1945

THE LAST FREEZE OF THE SPRING OCCURRED ON APRIL 22. THIS WAS A FEW
DAYS EARLIER THAN THE NORMAL LAST FREEZE OF APRIL 26 AND ALSO TIED
AS THE 8TH EARLIEST LAST FREEZE ON RECORD. THE FOLLOWING TABLE LISTS
THE EARLIEST LAST SPRING FREEZES ON RECORD AT PORTLAND.

EARLIEST LAST FREEZE IN SPRING (SINCE 1941)...
RANK  DATE
1     APR 14, 1983
2     APR 15, 1973
      APR 15, 1976
4     APR 19, 1990
5     APR 20, 2014
      APR 20, 1991
      APR 20, 1970
8     APR 22, 2021  <===
      APR 22, 1953
10    APR 23, 2020*
*MOST RECENT OF SEVERAL OCCURRENCES

A TOTAL OF 8.50 INCHES OF PRECIPITATION FELL WHICH WAS 3.66 INCHES
BELOW NORMAL AND THE DRIEST SPRING SINCE 2016. THE HEAVIEST
PRECIPITATION WAS ON MARCH 28 AND 29 WHEN 1.49 INCHES WAS MEASURED.
THE DRIEST SPRING WAS IN 1965 WHEN ONLY 4.23 INCHES FELL. THE
WETTEST WAS IN 1983 WITH 22.55 INCHES.

A TOTAL OF 0.4 INCHES OF SNOW FELL WHICH WAS 16.0 INCHES BELOW
NORMAL AND THE 4TH LEAST SNOWY SPRING ON RECORD. THE HEAVIEST SNOW
WAS ON APRIL 16 WHEN 0.3 INCHES FELL. THE SNOWIEST SPRING WAS IN
1993 WHEN 60.1 INCHES WAS RECORDED. THE LEAST SNOWY WAS IN 2010 WITH
ONLY 0.1 INCHES. THE FOLLOWING TABLE LISTS THE LEAST SNOWY SPRINGS
IN PORTLAND.

LEAST SNOWFALL IN SPRING (SINCE 1882)...
RANK  SNOW   YEAR
1     TRACE  1921
      TRACE  1910
3      0.1   2010
4      0.4   2021  <===
5      1.1   1995
6      1.3   1930
7      1.4   1927
8      1.5   2006
9      2.1   1983
10     2.8   1973

THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN SPRING 2021...
DATE    RECORD                               PREVIOUS
MAR 15  21   - COLDEST HIGH TEMPERATURE      23 IN 1993
MAR 25  48   - WARMEST AVERAGE TEMPERATURE   48 IN 1953 (TIED)
MAR 26  43   - WARMEST LOW TEMPERATURE       43 IN 1953 (TIED)
APR 22  39   - COOLEST HIGH TEMPERATURE      40 IN 2002
MAY 26  76   - WARMEST AVERAGE TEMPERATURE   75 IN 2015
MAY 29  47   - COOLEST AVERAGE TEMPERATURE   47 IN 1968 (TIED)

$$

KIMBLE


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