Climatological Report (Seasonal)
Issued by NWS Portland, ME

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CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAY ME
716 AM EST TUE DEC 5 2017

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

...THE PORTLAND ME CLIMATE SUMMARY FOR THE FALL SEASON, FROM
9/1/2017 TO 11/30/2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1941 TO 2017

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   09/24        86       0       91  09/09
LOWEST             17   11/28        16       1       23  11/29
                        11/11
AVG. MAXIMUM     62.8              58.9     3.9     61.5
AVG. MINIMUM     43.2              40.0     3.2     42.3
MEAN             53.0              49.4     3.6     51.9
DAYS MAX >= 90      0               0.3    -0.3        1
DAYS MAX <= 32      0               1.0    -1.0        0
DAYS MIN <= 32     23              26.1    -3.1       21
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        24.18   2005
 MINIMUM         4.88   1915
TOTALS           9.47             13.49   -4.02    13.28
DAILY AVG.       0.10              0.15   -0.05     0.15
DAYS >= .01        24              30.9    -6.9       30
DAYS >= .10        14              19.4    -5.4       18
DAYS >= .50         8               8.1    -0.1        6
DAYS >= 1.00        2               3.6    -1.6        4
GREATEST
 24 HR. TOTAL    1.76   10/26

SNOWFALL (INCHES)
RECORDS
 TOTAL           24.3   1921
TOTALS            0.1               1.9    -1.8      0.5
SINCE 7/1         0.1               1.9    -1.8      0.5
SNOWDEPTH AVG.      0
DAYS >= TRACE       2               1.5     0.5        3
DAYS >= 1.0         0               0.7    -0.7        0
GREATEST
 SNOW DEPTH         T   11/14
 24 HR TOTAL      0.1   11/13

DEGREE_DAYS
HEATING TOTAL    1132              1446    -314     1238
 SINCE 7/1       1165              1491    -326     1252
COOLING TOTAL      69                31      38       68
 SINCE 1/1        433               359      74      553
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              7.5
HIGHEST WIND SPEED/DIRECTION    48/130    DATE  10/30
HIGHEST GUST SPEED/DIRECTION    69/130    DATE  10/30

SKY COVER
AVERAGE SKY COVER           0.50

AVERAGE RH (PERCENT)     71

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              3     HEAVY RAIN                 8
RAIN                     16     LIGHT RAIN                30
FREEZING RAIN             0     LT FREEZING RAIN           0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                1     FOG                       35
FOG W/VIS <= 1/4 MILE     9     HAZE                       2

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

&&

AFTER A RELATIVELY COOL AUGUST, THE COOL FALL-LIKE WEATHER CONTINUED
INTO THE FIRST FEW DAYS OF SEPTEMBER. AFTER A FEW DAYS OF RAIN,
INCLUDING NEARLY AN INCH ON SEPTEMBER 3, A NEW WEATHER PATTERN BEGAN
TO EMERGE. A RIDGE OF HIGH PRESSURE OVER THE WESTERN ATLANTIC AND
THE EAST COAST BROUGHT RELATIVELY WARM AIR NORTHWARD INTO NEW
ENGLAND. ALTHOUGH A FEW COLD FRONTS MANAGED TO SNEAK INTO THE AREA
BRINGING BRIEFLY COOLER WEATHER, THE OVERALL TREND OF WARMER THAN
NORMAL TEMPERATURES CONTINUED FOR SEVERAL WEEKS. THE WARMEST PERIOD
WAS IN LATE SEPTEMBER WHEN PORTLAND SAW 5 STRAIGHT DAYS WITH
TEMPERATURES IN THE 80S FROM SEPTEMBER 23 THRU 27. THE PERSISTENT
WARMTH CONTINUED DEEP INTO OCTOBER, BRINGING PORTLAND ITS SECOND
WARMEST SEPTEMBER AND WARMEST OCTOBER ON RECORD. AFTER A MOSTLY DRY
FIRST HALF OF FALL, A SERIES OF LOW PRESSURE SYSTEMS MOVED THROUGH
NEW ENGLAND LATE IN OCTOBER. MORE THAN 3 INCHES OF RAIN FELL ON
OCTOBER 25 AND 26. ANOTHER LOW PRESSURE SYSTEM BROUGHT ANOTHER INCH
OF RAIN AND STRONG WINDS GUSTING TO 69 MPH ON THE NIGHT OF OCTOBER
29 INTO THE MORNING OF THE 30TH. THE STRONG WINDS BROUGHT
SIGNIFICANT WIND DAMAGE TO THE REGION. THIS PERIOD OF STORMY WEATHER
SIGNALED A COMING CHANGE IN THE WEATHER PATTERN AS THE PERSISTENT
WARMTH FINALLY BEGAN TO BREAK DOWN. PORTLAND FINALLY SAW ITS FIRST
FREEZE ON NOVEMBER 1, ONLY THE SECOND TIME ON RECORD THAT THE FIRST
FREEZE DID NOT ARRIVE UNTIL THE MONTH OF NOVEMBER. AFTER ANOTHER
BRIEF PERIOD OF WARMTH, A COLD FRONT ON NOVEMBER 6 BROUGHT COLD AIR
INTO THE REGION. EVEN COLDER AIR POURED IN STRAIGHT OUT OF THE
ARCTIC A FEW DAYS LATER WITH PORTLAND FALLING ALL THE WAY TO 17
DEGREES ON NOVEMBER 11. THE FIRST MEASURABLE SNOW OF THE SEASON
OCCURRED A FEW DAYS LATER WHEN 0.1 INCHES FELL ON NOVEMBER 13. COLD
WEATHER CONTINUED THROUGH MUCH OF NOVEMBER WITH ONLY BRIEF
EXCEPTIONS AS A SERIES OF COLD FRONTS KEPT BRINGING MORE COLD AIR IN
DURING THE MONTH. ALTHOUGH THE FALL ENDED COLDER THAN NORMAL, THE
VERY WARM START TO THE SEASON ENSURED PORTLAND WOULD FINISH TIED AS
THE WARMEST FALL ON RECORD.

THE AVERAGE TEMPERATURE FOR THE FALL WAS 53.0 DEGREES WHICH WAS 3.6
DEGREES ABOVE NORMAL AND TIED FOR THE WARMEST FALL ON RECORD. THE
AVERAGE TEMPERATURE WAS ALSO 53.0 DEGREES IN 2011. THE COOLEST FALL
WAS IN 1976 WHEN THE AVERAGE TEMPERATURE WAS 45.6 DEGREES. THE
FOLLOWING TABLE LISTS THE WARMEST FALL SEASONS ON RECORD AT PORTLAND.

WARMEST AVERAGE TEMPERATURE IN FALL (SINCE 1940)...
RANK  TEMP  YEAR
1     53.0  2017 <===
      53.0  2011
3     52.3  2015
4     51.9  2016
5     51.5  2005
      51.5  1961
7     51.3  1990
      51.3  1970
9     51.2  2014
10    51.0  2007
      51.0  2006

THE FIRST FREEZE OF THE SEASON OCCURRED ON NOVEMBER 1, ABOUT 3 WEEKS
LATER THAN NORMAL. THIS WAS ONLY THE SECOND TIME THAT PORTLAND MADE
IT THROUGH THE MONTH OF OCTOBER WITHOUT SEEING A FREEZE. THE
FOLLOWING TABLE LISTS THE LATEST DATES OF THE FIRST FALL FREEZE AT
PORTLAND.

LATEST DATE OF FIRST FALL FREEZE (SINCE 1940)...
RANK  DATE    YEAR
1     NOV 3   2014
2     NOV 1   2017 <===
3     OCT 25  2013
      OCT 25  1949
5     OCT 21  2005
      OCT 21  1990
      OCT 21  1985
8     OCT 19  1970
9     OCT 18  2008
10    OCT 17  2015

A TOTAL OF 9.47 INCHES OF PRECIPITATION FELL WHICH WAS 4.02 INCHES
BELOW NORMAL AND THE SECOND DRIEST FALL IN THE LAST 16 YEARS. ALMOST
HALF OF THE RAIN THAT FELL THIS FALL FELL DURING THE LAST WEEK OF
OCTOBER WHEN MORE THAN 4.5 INCHES OF RAIN WAS MEASURED, INCLUDING
3.14 INCHES ON OCTOBER 25 AND 26. THE DRIEST FALL ON RECORD WAS IN
1915 WHEN ONLY 4.88 INCHES OF PRECIPITATION WAS RECORDED. THE
WETTEST WAS IN 2005 WHEN 24.18 INCHES FELL.

ONLY 0.1 INCHES OF SNOW FELL WHICH WAS 1.8 INCHES BELOW NORMAL. FALL
SNOWFALL CAN BE QUITE VARIABLE, WITH MEASURABLE SNOWFALL OBSERVED
ABOUT 75 PERCENT OF THE TIME. THE SNOWIEST FALL WAS IN 1921 WHEN
24.3 INCHES WAS MEASURED. NO SNOW FELL IN FALL IN 4 SEPARATE YEARS,
MOST RECENTLY IN 2006. ONLY A TRACE FELL IN 30 SEPARATE YEARS, MOST
RECENTLY IN 2015.

THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN FALL 2017...
DATE    RECORD                               PREVIOUS
SEP 20  65   - WARMEST LOW TEMPERATURE       64 IN 2016
SEP 27  84   - WARMEST HIGH TEMPERATURE      84 IN 2014 /TIED/
SEP 27  72   - WARMEST AVERAGE TEMPERATURE   67 IN 2014 AND OTHERS
OCT 8   62   - WARMEST LOW TEMPERATURE       57 IN 2014
OCT 8   68   - WARMEST AVERAGE TEMPERATURE   68 IN 1947 /TIED/
OCT 9   59   - WARMEST LOW TEMPERATURE       56 IN 1949
OCT 11  61   - WARMEST AVERAGE TEMPERATURE   61 IN 1955 /TIED/
OCT 24  57   - WARMEST LOW TEMPERATURE       55 IN 2001 AND 1959
OCT 25  58   - WARMEST LOW TEMPERATURE       51 IN 1959
OCT 25  62   - WARMEST AVERAGE TEMPERATURE   60 IN 1963
OCT 29  56   - WARMEST LOW TEMPERATURE       53 IN 2015

$$

KIMBLE


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