Climatological Report (Seasonal)
Issued by NWS Portland, ME

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TTAA00 KGYX 031910


CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAY ME
415 PM EST WED DEC 5 2018

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

...THE PORTLAND ME CLIMATE SUMMARY FOR THE FALL SEASON, FROM
9/1/2018 TO 11/30/2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1941 TO 2018 /FOR TEMPERATURES/
CLIMATE RECORD PERIOD 1871 TO 2018 /FOR PRECIPITATION/
CLIMATE RECORD PERIOD 1882 TO 2018 /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            92   09/06        86       6       86  09/24
LOWEST              4   11/23        16     -12       17  11/28
                                                          11/11
AVG. MAXIMUM     56.9              58.9    -2.0     62.8
AVG. MINIMUM     41.1              40.0     1.1     43.2
MEAN             49.0              49.4    -0.4     53.0
DAYS MAX >= 90      2               0.3     1.7        0
DAYS MAX <= 32      3               1.0     2.0        0
DAYS MIN <= 32     24              26.1    -2.1       23
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        24.18   2005
 MINIMUM         4.88   1915
TOTALS          20.98             13.49    7.49     9.47
DAILY AVG.       0.23              0.15    0.08     0.10
DAYS >= .01        40              30.9     9.1       24
DAYS >= .10        29              19.4     9.6       14
DAYS >= .50        17               8.1     8.9        8
DAYS >= 1.00        7               3.6     3.4        2
GREATEST
 24 HR. TOTAL    2.08   09/11

SNOWFALL (INCHES)
RECORDS
 TOTAL           24.3   1921
TOTALS           15.9               1.9    14.0      0.1
SINCE 7/1        15.9               1.9    14.0      0.1
SNOWDEPTH AVG.      1
DAYS >= TRACE      11               1.5     9.5        2
DAYS >= 1.0         3               0.7     2.3        0
GREATEST
 SNOW DEPTH         8   11/21
 24 HR TOTAL      7.1   11/20

DEGREE_DAYS
HEATING TOTAL    1527              1446      81     1132
 SINCE 7/1       1533              1491      42     1165
COOLING TOTAL      89                31      58       69
 SINCE 1/1        585               359     226      433
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              7.2
HIGHEST WIND SPEED/DIRECTION    36/290    DATE  10/16
HIGHEST GUST SPEED/DIRECTION    47/290    DATE  10/16

SKY COVER
AVERAGE SKY COVER           0.60

AVERAGE RH (PERCENT)     77


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

&&

"FALL" IS A GREAT WORD TO USE TO DESCRIBE THIS SEASON IN PORTLAND AS
THE TEMPERATURE TOOK QUITE A TUMBLE OVER THE COURSE OF THE FALL
MONTHS. FROM THE 5TH WARMEST SEPTEMBER ON RECORD TO THE 5TH COLDEST
NOVEMBER ON RECORD, THE TRANSITION SEASON FROM SUMMER TO WINTER WAS
MORE ABRUPT THAN USUAL. THE AUTUMN BEGAN WITH A RIDGE OF HIGH
PRESSURE OVER THE EAST COAST AND WESTERN ATLANTIC WHICH PULLED WARM,
HUMID AIR AROUND IT AND INTO NEW ENGLAND. MOST OF SEPTEMBER WAS WARM
WITH ONLY BRIEF PERIODS OF COOLER WEATHER BEHIND OCCASIONAL COLD
FRONTS. THE HOTTEST TEMPERATURES WERE OBSERVED IN THE FIRST WEEK OF
SEPTEMBER WHEN THE TEMPERATURE CRACKED 90 DEGREES TWICE. A FEW
PASSING STORMS BROUGHT INFREQUENT HEAVY RAINFALL, INCLUDING MORE
THAN 2 INCHES ON SEPTEMBER 11.

THE PATTERN DID NOT BEGIN TO CHANGE UNTIL MID OCTOBER, SO SOME
SUMMER LIKE TEMPERATURES WERE OBSERVED DEEP INTO THE FALL SEASON.
PORTLAND TOPPED 80 DEGREES TWO DAYS IN A ROW ON OCTOBER 9 AND 10.
THIS PROVED TO BE THE LAST OF THE WARM WEATHER WITH THE FIRST FREEZE
AND FIRST SNOWFLAKES OF THE SEASON COMING JUST A WEEK LATER ON
OCTOBER 18. THE PATTERN WAS QUICKLY SHIFTING AS A TROUGH DEVELOPED
OVER THE EASTERN UNITED STATES BRINGING SEVERAL ROUNDS OF COLD AIR
INTO THE AREA. BEING FREQUENTLY ON THE EASTERN SIDE OF THIS TROUGH
MEANT THAT STORM SYSTEMS EXITING THE COUNTRY FREQUENTLY PASSED NEAR
NEW ENGLAND BRINGING PRECIPITATION EVERY FEW DAYS. THE COOL,
FREQUENTLY WET WEATHER LED TO A LOT OF COOL DAYS AND WARM NIGHTS,
AND OCTOBER FINISHED COOLER THAN NORMAL FOR THE FIRST TIME SINCE
2009. THE COOL AND WET PATTERN CONTINUED RIGHT THROUGH NOVEMBER.
EVEN THOUGH COOL WEATHER PREDOMINATED, THERE WERE TWO EVEN MORE
SIGNIFICANT COLD PERIODS WORTH MENTIONING AS SOME BRUTALLY COLD
ARCTIC AIR PLUNGED SOUTH INTO NEW ENGLAND. THE FIRST WAS HERALDED BY
A COLD FRONT ON NOVEMBER 13. AFTER 1.5 INCHES OF RAIN, THE
TEMPERATURE PLUMMETED. PORTLAND DID NOT EVEN RISE ABOVE FREEZING ON
NOVEMBER 15, ABOUT TWO WEEKS EARLIER THAN THE AVERAGE FIRST
SUBFREEZING DAY. WITH THE EVEN COLDER AIR IN PLACE, THE FREQUENT
PRECIPITATION BECAME SNOW, AND PORTLAND SAW ITS FIRST SNOWSTORM OF
THE SEASON ON NOVEMBER 16 WITH MORE THAN 6 INCHES FALLING. A RARE
SECOND NOVEMBER SNOWSTORM CAME JUST A FEW DAYS LATER WITH MORE THAN
7 INCHES RECORDED ON NOVEMBER 20. THIS WAS THE FIRST TIME SINCE 1898
THAT PORTLAND SAW TWO 6 INCH SNOWSTORMS IN NOVEMBER. EVEN COLDER AIR
FOLLOWED THIS SECOND STORM JUST IN TIME FOR THANKSGIVING.
THANKSGIVING DAY, NOVEMBER 22, WAS THE COLDEST DAY ON RECORD FOR THE
FALL SEASON AT PORTLAND. AFTER DROPPING TO 6 DEGREES THAT MORNING IT
ONLY WARMED TO 17 THAT AFTERNOON.  THE TEMPERATURE GRADUALLY
MODERATED BACK TOWARD NORMAL BY THE END OF NOVEMBER WITH SNOW
CHANGING BACK TO RAIN, BUT IT WAS NOT ENOUGH TO GET RID OF THE EARLY
SEASON SNOW COVER.

THE AVERAGE TEMPERATURE FOR THE FALL WAS 49.0 DEGREES WHICH WAS 0.4
DEGREES BELOW NORMAL AND THE FIRST BELOW NORMAL FALL SINCE 2002. IN
FACT, THE LAST 4 FALLS WERE ALL AMONG THE TOP 10 WARMEST ON RECORD
AT PORTLAND ALLOWING THIS FALL TO STAND OUT EVEN MORE PROMINENTLY.
ALTHOUGH ONLY SLIGHTLY BELOW NORMAL IN AVERAGE TEMPERATURE, THE
AVERAGE HIGH TEMPERATURE THIS FALL WAS THE 9TH COOLEST ON RECORD, A
REFLECTION OF THE HUMID START TO THE SEASON AND THE COOL AND STORMY
WEATHER PATTERN THAT EVENTUALLY DEVELOPED. THE COOLEST FALL ON
RECORD WAS IN 1976 WHEN THE AVERAGE TEMPERATURE WAS 45.6 DEGREES.
THE WARMEST WAS 53.0 DEGREES RECORDED JUST LAST YEAR, 2017, AS WELL
AS 2011.

THE FIRST FREEZE OF THE SEASON CAME ON OCTOBER 18, 10 DAYS LATER
THAN NORMAL. ALTHOUGH THIS WAS AMONG THE EARLIEST FREEZES IN RECENT
YEARS, IT WAS TIED FOR THE 9TH LATEST DATE OF THE FIRST FALL FREEZE
ON RECORD. THIS COMBINED WITH AN EARLY END TO THE FREEZE SEASON IN
SPRING TO CREATE THE 5TH LONGEST GROWING SEASON AT PORTLAND AT 178
DAYS. THE FOLLOWING TABLE LISTS THE LONGEST GROWING SEASONS AT
PORTLAND.

LONGEST STRETCHES OF ABOVE FREEZING TEMPERATURES (SINCE 1940)...
RANK  DAYS  DATES
1      197  APR 20 TO NOV 3, 2014
2      185  APR 19 TO OCT 21, 1990
3      182  APR 20 TO OCT 19, 1970
4      180  APR 14 TO OCT 11, 1983
5      178  APR 23 TO OCT 18, 2018  <===
6      177  MAY 1 TO OCT 25, 2013
7      176  MAY 9 TO NOV 1, 2017
       176  APR 20 TO OCT 13, 1991
9      175  APR 25 TO OCT 17, 2015
10     174  APR 26 TO OCT 17, 2007

THANKSGIVING DAY, NOVEMBER 22, WAS THE COLDEST FALL DAY ON RECORD AT
PORTLAND.  THE FOLLOWING TABLE LISTS THE COLDEST HIGHS AND LOWS ON
RECORD FOR THE FALL SEASON.

COLDEST TEMPERATURES OBSERVED IN FALL (SINCE 1940)...
HIGH TEMPERATURE                |  LOW TEMPERATURE
RANK  TEMP  DATE                |  TEMP  DATE
1      17   NOV 22, 2018  <===  |    3   NOV 24, 1989
2      20   NOV 27, 1978        |    4   NOV 23, 2018  <===
3      22   NOV 23, 1989        |    5   NOV 29, 1949
4      23   NOV 27, 1940        |    6   NOV 22, 2018  <===
5      25   NOV 27, 1949        |    6   NOV 27, 1957
6      26   NOV 30, 1958        |    6   NOV 28, 1940

A TOTAL OF 20.98 INCHES OF PRECIPITATION FELL WHICH WAS 7.49 INCHES
ABOVE NORMAL AND THE 4TH WETTEST FALL ON RECORD. ALTHOUGH THE LAST
HALF OF THE FALL WAS NOTABLE FOR THE FREQUENT STORMINESS, THE
HEAVIEST PRECIPITATION ACTUALLY FELL ON SEPTEMBER 10 AND 11 WHEN
2.71 INCHES OF RAIN WAS RECORDED. MEASURABLE PRECIPITATION FELL ON
40 DAYS THIS FALL, THE MOST SUCH DAYS SINCE 1945. THE WETTEST FALL
ON RECORD WAS IN 2005 WHEN 24.18 INCHES OF PRECIPITATION FELL. THE
DRIEST WAS IN 1915 WHEN ONLY 4.88 INCHES WAS RECORDED. THE FOLLOWING
TABLE LISTS THE WETTEST FALLS ON RECORD AT PORTLAND.

MOST PRECIPITATION IN FALL (SINCE 1871)...
RANK  PRECIP  YEAR
1      24.18   2005
2      23.15   1888
3      22.20   1996
4      20.98   2018  <===
5      19.39   1977
6      19.38   2008
7      19.05   1962
8      18.23   1983
9      18.08   1990
10     17.59   1886

A TOTAL OF 15.9 INCHES OF SNOW FELL WHICH WAS 14.0 INCHES ABOVE
NORMAL AND THE 5TH SNOWIEST FALL ON RECORD. THERE WERE TWO
SNOWSTORMS WHICH DROPPED 6 INCHES OR MORE OF SNOWFALL; 1898 WAS THE
ONLY OTHER YEAR IN WHICH THIS HAPPENED. THE SNOWIEST FALL ON RECORD
WAS IN 1921 WHEN 24.3 INCHES FELL. THERE HAVE BEEN 4 FALLS WITH NO
SNOW RECORDED, MOST RECENTLY IN 2006. AN ADDITIONAL 30 FALLS ONLY
RECORDED A TRACE OF SNOW, MOST RECENTLY IN 2015. THE FOLLOWING TABLE
LISTS THE SNOWIEST FALLS ON RECORD AT PORTLAND.

MOST SNOWFALL IN FALL (SINCE 1881)...
RANK  SNOW  YEAR
1     24.3  1921
2     22.6  1898
3     20.5  1997
4     16.5  1938
5     15.9  2018  <===
6     15.6  1972
7     15.3  1968
8     15.2  1920
9     14.1  1904

THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN FALL 2018...
DATE    RECORD                               PREVIOUS
SEP 4   68   - WARMEST LOW TEMPERATURE       63 IN 2011 AND OTHERS
SEP 4   78   - WARMEST AVERAGE TEMPERATURE   74 IN 1971
SEP 6   92   - WARMEST HIGH TEMPERATURE      88 IN 1983
SEP 6   66   - WARMEST LOW TEMPERATURE       66 IN 1969 AND OTHERS (TIED)
SEP 6   79   - WARMEST AVERAGE TEMPERATURE   76 IN 2014 AND 1983
SEP 17  63   - WARMEST LOW TEMPERATURE       63 IN 2004 AND OTHERS (TIED)
OCT 1   4    - SMALLEST TEMPERATURE RANGE    5 IN 2008 AND 1966
OCT 10  84   - WARMEST HIGH TEMPERATURE      81 IN 2011 AND 1949
OCT 10  70   - WARMEST AVERAGE TEMPERATURE   70 IN 1949
NOV 2    2   - SMALLEST TEMPERATURE RANGE    3 IN 1957
NOV 15  31   - COLDEST HIGH TEMPERATURE      31 IN 1996 (TIED)
NOV 15  15   - COLDEST LOW TEMPERATURE       16 IN 1971 AND OTHERS
NOV 15  23   - COLDEST AVERAGE TEMPERATURE   24 IN 1996
NOV 20  7.1  - MOST SNOWFALL                 6.5 IN 1914
NOV 22  17   - COLDEST HIGH TEMPERATURE      29 IN 2008 AND OTHERS
NOV 22   6   - COLDEST LOW TEMPERATURE       13 IN 1972
NOV 22  12   - COLDEST AVERAGE TEMPERATURE   22 IN 1978 AND 1972
NOV 23   4   - COLDEST LOW TEMPERATURE       7 IN 1978
NOV 23  16   - COLDEST AVERAGE TEMPERATURE   17 IN 1989
NOV 25   3   - SMALLEST TEMPERATURE RANGE    3 IN 1992 (TIED)
NOV 26   3   - SMALLEST TEMPERATURE RANGE    5 IN 2009 AND OTHERS

$$

KIMBLE


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