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Climatological Report (Seasonal)
Issued by NWS Portland, ME
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CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAY ME
1145 AM EDT WED SEP 2 2020

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

...THE PORTLAND ME CLIMATE SUMMARY FOR THE SUMMER SEASON, FROM
6/1/2020 TO 8/31/2020...

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             103   08/02/1975
 LOW               33   08/31/1965
                        06/04/1944
HIGHEST            94   07/20        93       1       94  07/21
LOWEST             37   06/01        42      -5       47  08/26
                                                          06/09
                                                          06/04
AVG. MAXIMUM     79.9              76.6     3.3     77.8
AVG. MINIMUM     61.1              57.1     4.0     58.8
MEAN             70.5              66.9     3.6     68.3
DAYS MAX >= 90     13               3.9     9.1        4
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.0     0.0        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        22.31   2009
 MINIMUM         4.10   1999
TOTALS           7.96             10.54   -2.58    12.85
DAILY AVG.       0.09              0.11   -0.02     0.14
DAYS >= .01        27              32.1    -5.1       32
DAYS >= .10        15              18.7    -3.7       23
DAYS >= .50         4               6.4    -2.4       11
DAYS >= 1.00        2               2.4    -0.4        2
GREATEST
 24 HR. TOTAL    2.51   06/29

SNOWFALL (INCHES)
RECORDS
 TOTAL            0.0
TOTALS            0.0               0.0     0.0      0.0
SINCE 7/1         0.0               0.0     0.0      0.0
SNOWDEPTH AVG.      0
DAYS >= TRACE       0               0.0     0.0        0
DAYS >= 1.0         0               0.0     0.0        0
GREATEST
 SNOW DEPTH         0
 24 HR TOTAL      0.0

DEGREE_DAYS
HEATING TOTAL      73               151     -78      106
 SINCE 7/1         15                45     -30       13
COOLING TOTAL     605               321     284      433
 SINCE 1/1        623               328     295      436
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              6.5
HIGHEST WIND SPEED/DIRECTION    31/300    DATE  08/30
HIGHEST GUST SPEED/DIRECTION    44/140    DATE  08/04

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 SUMMER MONTHS AT PORTLAND WERE CHARACTERIZED BY VERY WARM AND
HUMID CONDITIONS AND BELOW NORMAL PRECIPITATION. HOWEVER, THAT IS
NOT HOW SUMMER BEGAN AS THE LOW TEMPERATURE ON JUNE 1 WAS 37
DEGREES, THE COLDEST TEMPERATURE OBSERVED AT PORTLAND IN THE
MONTH OF JUNE SINCE 1967. WARMER AND MORE HUMID CONDITIONS
ARRIVED TOWARD THE MIDDLE OF JUNE. A PROLONGED STRETCH OF DRY
WEATHER BEGAN IN MID-MAY AND EXTENDED UNTIL THE LAST THREE DAYS
OF JUNE WHEN NEARLY 90% OF JUNE`S OBSERVED PRECIPITATION FELL.
MORE FREQUENT RAINFALL WAS OBSERVED FOR THE FIRST PART OF JULY TO
HELP EASE THE ONGOING DROUGHT BEFORE DRIER CONDITIONS RETURNED
FOR THE LATTER HALF OF THE MONTH. AFTER THE COOLEST INDEPENDENCE
DAY SINCE 1998, THE HEAT AND HUMIDITY BEGAN TO BUILD INTO THE
REGION AND PERSISTED THROUGH THE END OF THE MONTH. IT MANIFESTED
PRIMARILY IN THE FORM OF WARM NIGHTTIME LOWS, INCLUDING A LOW OF
78 DEGREES ON JULY 27 WHICH IS THE WARMEST LOW TEMPERATURE ON
RECORD AT PORTLAND, AND THE FIRST STRETCH OF 3 STRAIGHT DAYS
ABOVE 90 DEGREES (JULY 26-28) SINCE JULY 2011. THE RESULT WAS
THAT JULY ENDED AS THE WARMEST OVERALL MONTH ON RECORD AT
PORTLAND. THE WARM AND HUMID CONDITIONS CONTINUED THROUGH THE
FIRST HALF OF AUGUST, INCLUDING ANOTHER STRETCH OF 3 STRAIGHT
DAYS ABOVE 90 DEGREES (AUGUST 11-13). A SERIES OF COLD FRONTS
FINALLY BROUGHT COOLER AND LESS HUMID CONDITIONS FOR THE LATTER
HALF OF AUGUST. HOWEVER, THE ONGOING DROUGHT CONDITIONS PERSISTED
AS AUGUST BECAME THE 4TH CONSECUTIVE MONTH WITH BELOW NORMAL
PRECIPITATION AT PORTLAND.

THE AVERAGE TEMPERATURE FOR THE SUMMER WAS 70.5 DEGREES WHICH WAS
3.6 DEGREES ABOVE NORMAL AND BY FAR THE WARMEST SUMMER ON RECORD.
UNTIL THIS YEAR, THE WARMEST SUMMER WAS 68.9 DEGREES IN 2018 AND
2016. THE COOLEST SUMMER WAS 63.7 DEGREES IN 1964, 1962, AND 1954.
THE FOLLOWING TABLE LISTS THE WARMEST SUMMERS ON RECORD AT PORTLAND.

WARMEST AVERAGE TEMPERATURE IN SUMMER (SINCE 1940)...
RANK  AVE  YEAR
1    70.5  2020  <===
2    68.9  2018
     68.9  2016
4    68.7  1988
     68.7  2010
6    68.6  1999
7    68.5  2012
     68.5  1991
     68.5  1973
10   68.3  2019
     68.3  1994

ALTHOUGH THE HOTTEST TEMPERATURE WAS 94, THERE WERE A TOTAL OF 13
DAYS THAT REACHED 90 OR HIGHER. THE WARMTH WAS EVEN MORE PRONOUNCED
IN NIGHTTIME LOWS AS THE TEMPERATURE DID NOT COOL AS MUCH IN THE
HUMID CONDITIONS. THE FOLLOWING TABLE LISTS THE NUMBER OF 90 DEGREE
DAYS, 70 DEGREE LOWS, AND 65 DEGREE LOWS.

SUMMER TEMPERATURES (SINCE 1940)...
       HIGH 90+             LOW 70+              LOW 65+
RANK  DAYS  YEAR        |  DAYS  YEAR        |  DAYS  YEAR
1      15   1955        |   9    2020  <===  |   33   2020  <===
2      14   1988        |   8    2018        |   23   2018
3      13   2020  <===  |   5    2001        |   22   1988
4      13   1949        |   5    1988        |   19   2010
5      10   1941        |   4    2013        |   19   1969
6       9   2002        |   4    2011        |   18   2019
7       9   1944        |   4    2002        |   18   1973
8       8   2013        |   4    1973        |   17   2012
9       8   1993        |   3    1991        |   17   2006
10      8   1991        |   3    1969        |   17   2005

SOME OF THE WARMEST NIGHTS ON RECORD AT PORTLAND WERE OBSERVED THIS
SUMMER. THE FOLLOWING TABLE LISTS THE WARMEST LOW TEMPERATURES.

WARMEST LOW TEMPERATURE (SINCE 1940)...
RANK  LOW  DATE
1     78   JUL 27, 2020  <===
2     76   JUL 21, 2019
      76   JUL 22, 2011
4     74   AUG 2, 2006
      74   AUG 5, 1988
      74   JUL 17, 1969
7     73   JUL 28, 2020  <===
      73   JUL 20, 2020  <===
      73   JUL 5, 2013
      73   JUN 13, 2005
      73   JUL 22, 1994
      73   JUN 28, 1991
      73   AUG 2, 1975
      73   AUG 17, 1969

A TOTAL OF 7.96 INCHES OF RAIN FELL WHICH WAS 2.58 INCHES BELOW
NORMAL AND THE DRIEST SUMMER SINCE 2017. THE HEAVIEST RAIN FELL AT
THE END OF JUNE WHEN FREQUENT SHOWERS AND THUNDERSTORMS DROPPED 3.03
INCHES OF RAIN FROM JUNE 28 THROUGH JUNE 30. THE DRIEST SUMMER WAS
IN 1999 WHEN ONLY 4.10 INCHES WAS RECORDED. THE WETTEST WAS IN 2009
WITH 22.31 INCHES.

THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN SUMMER 2020...
DATE    RECORD                               PREVIOUS
JUN 5   65   - WARMEST LOW TEMPERATURE       62 IN 1960
JUN 5   75   - WARMEST AVERAGE TEMPERATURE   73 IN 1949
JUN 6   63   - WARMEST LOW TEMPERATURE       60 IN 1963
JUN 20  93   - WARMEST HIGH TEMPERATURE      93 IN 2012 & OTHERS (TIED)
JUN 20  69   - WARMEST LOW TEMPERATURE       67 IN 1941
JUN 20  81   - WARMEST AVERAGE TEMPERATURE   80 IN 1941
JUN 29  4    - SMALLEST TEMPERATURE RANGE    6 IN 1974 & 1973
JUL 11  68   - WARMEST LOW TEMPERATURE       67 IN 1955
JUL 12  71   - WARMEST LOW TEMPERATURE       70 IN 2011, 1943
JUL 13  67   - WARMEST LOW TEMPERATURE       67 IN 2010, 1943 (TIED)
JUL 17  8    - SMALLEST TEMPERATURE RANGE    9 IN 1995, 1949
JUL 20  73   - WARMEST LOW TEMPERATURE       71 IN 2019
JUL 20  84   - WARMEST AVERAGE TEMPERATURE   83 IN 1991, 1949
JUL 27  78   - WARMEST LOW TEMPERATURE       69 IN 1989, 1979
JUL 27  86   - WARMEST AVERAGE TEMPERATURE   80 IN 1989
JUL 28  73   - WARMEST LOW TEMPERATURE       69 IN 2006 AND OTHERS
JUL 28  83   - WARMEST AVERAGE TEMPERATURE   82 IN 1949
JUL 30  69   - WARMEST LOW TEMPERATURE       67 IN 2011 AND OTHERS
AUG 3   91   - WARMEST HIGH TEMPERATURE      91 IN 2002, 1990 (TIED)
AUG 3   70   - WARMEST LOW TEMPERATURE       70 IN 2001, 1943 (TIED)
AUG 3   81   - WARMEST AVERAGE TEMPERATURE   79 IN 2001
AUG 12  72   - WARMEST LOW TEMPERATURE       72 IN 1988 (TIED)
AUG 24  66   - WARMEST LOW TEMPERATURE       66 IN 2015, 2009 (TIED)

$$

KIMBLE/WATSON
National Weather Service Weather Forecast Office
