Climatological Report (Monthly)
Issued by NWS Portland, ME

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CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAY ME
614 PM EDT FRI NOV 3 2017

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

...THE PORTLAND ME CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1941 TO 2017 /FOR TEMPERATURES/
CLIMATE RECORD PERIOD 1871 TO 2017 /FOR PRECIPITATION/
CLIMATE RECORD PERIOD 1882 TO 2017 /FOR SNOWFALL/

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              88   10/07/1963
 LOW               15   10/28/1976
HIGHEST            77   10/10        75       2       78  10/19
LOWEST             33   10/17        26       7       30  10/27
                        10/13                             10/15
AVG. MAXIMUM     66.0              58.7     7.3     59.9
AVG. MINIMUM     46.2              38.9     7.3     40.9
MEAN             56.1              48.8     7.3     50.4
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               6.8    -6.8        5
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        16.86   1996
 MINIMUM         0.09   1924
TOTALS           5.14              4.87    0.27     8.36
DAILY AVG.       0.17              0.16    0.01     0.27
DAYS >= .01         9              10.5    -1.5       12
DAYS >= .10         6               6.5    -0.5        7
DAYS >= .50         4               2.7     1.3        3
DAYS >= 1.00        2               1.2     0.8        2
GREATEST
 24 HR. TOTAL    1.76   10/26

SNOWFALL (INCHES)
RECORDS
 TOTAL            5.2   2011
TOTALS            0.0                 T     0.0      0.0
SINCE 7/1         0.0                 T     0.0      0.0
SNOWDEPTH AVG.      0
DAYS >= TRACE       0               0.0     0.0
DAYS >= 1.0         0               0.0     0.0
GREATEST
 SNOW DEPTH         0
 24 HR TOTAL      0.0

DEGREE_DAYS
HEATING TOTAL     271               503    -232      445
 SINCE 7/1        372               724    -352      556
COOLING TOTAL       4                 1       3        0
 SINCE 1/1        433               359      74      553
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              7.7
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)     74

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              2     HEAVY RAIN                 4
RAIN                      7     LIGHT RAIN                10
FREEZING RAIN             0     LT FREEZING RAIN           0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     FOG                       13
FOG W/VIS <= 1/4 MILE     6     HAZE                       0

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

&&

ALTHOUGH OCTOBER BEGAN WITH A FEW DAYS OF TYPICALLY COOL FALL-LIKE
WEATHER, A WEATHER PATTERN BEGAN TO EMERGE WHICH FEATURED PERSISTENT
WARM WEATHER. A RIDGE OF HIGH PRESSURE OVER THE WESTERN ATLANTIC AND
A PERSISTENT TROUGH IN THE CENTER OF THE UNITED STATES LED TO A
PERSISTENT SOUTH TO SOUTHWESTERLY AIR FLOW ACROSS NEW ENGLAND,
TRANSPORTING WARM AND OFTEN HUMID AIR INTO THE AREA. THIS PATTERN
REMAINED REMARKABLY CONSISTENT THROUGH THE MONTH, THOUGH THERE WERE
A FEW COLD FRONTS WHICH MANAGED TO SNEAK IN AND BRING BRIEFLY COOLER
WEATHER. THE COOLEST TEMPERATURE OBSERVED THIS MONTH WAS 33 DEGREES
ON THE 13TH AND 17TH, EACH OF THESE BEING OBSERVED IN THE BRIEFLY
COOLER AIR MASSES BEHIND A COLD FRONT. THE REST OF THE MONTH WAS
RELATIVELY WARM, WITH PORTLAND REACHING THE END OF OCTOBER WITHOUT
HITTING THE FREEZING MARK FOR ONLY THE SECOND TIME ON RECORD. MUCH
OF THE MONTH WAS DRY, FITTING IN WITH A SUMMER AND FALL TREND OF
DRIER THAN NORMAL CONDITIONS. HOWEVER, THE LAST WEEK OF OCTOBER SAW
TWO STRONG STORM SYSTEMS BRING HEAVY RAINFALL. THE FIRST DROPPED
MORE THAN 3 INCHES OF RAIN ON THE 25TH AND 26TH, WHILE THE NEXT ONE
BROUGHT MORE WIND THAN RAIN. ALTHOUGH 1.32 INCHES FELL ON THE 29TH
AND 30TH, THE WIND GUST TO 69 MPH WAS THE BIGGER STORY, AS THIS
BROUGHT WIND DAMAGE TO THE PORTLAND AREA AND EXTENDED POWER OUTAGES
FOR SOME RESIDENTS.

THE WIND GUST TO 69 MPH DURING THE EARLY MORNING HOURS OF OCTOBER 30
TIED AS THE 7TH HIGHEST WIND GUST RECORDED AT PORTLAND, AND THE
HIGHEST WIND GUST RECORDED IN THE MONTH OF OCTOBER. THE FOLLOWING
TABLE LISTS ALL THE RECORDED WIND GUSTS OF 60 MPH OR HIGHER AT
PORTLAND.

WIND GUSTS OF 60 MPH OR HIGHER AT PORTLAND (SINCE 1872)...
RANK  GUST  DATE
1      78*  FEB 25, 2010
2      76   NOV 20, 1945
       76   MAR 3, 1947
       76   SEP 12, 1960
5      72   NOV 12, 1995
6      70   SEP 27, 1985
7      69   OCT 30, 2017 <===
       69   AUG 31, 1954
9      63   OCT 29, 2012
10     61   AUG 19, 1991
11     60   SEP 11, 1954

*THE HIGHEST WIND GUST OF 78 MPH ON FEB 25, 2010 WAS RECORDED
SHORTLY BEFORE A POWER OUTAGE RENDERED THE WIND SENSOR INOPERABLE.
IT IS POSSIBLE THAT A HIGHER GUST MAY HAVE OCCURRED, BUT IT WAS NOT
RECORDED.

THE AVERAGE TEMPERATURE FOR THE MONTH WAS 56.1 DEGREES WHICH WAS 7.3
DEGREES ABOVE NORMAL AND THE WARMEST OCTOBER ON RECORD AT PORTLAND.
THE PREVIOUS WARMEST OCTOBER WAS IN 1947 WHEN THE AVERAGE
TEMPERATURE WAS 55.3 DEGREES. THE COLDEST WAS IN 1976 WHEN IT WAS
ONLY 43.5 DEGREES. THE FOLLOWING TABLE LISTS THE WARMEST OCTOBERS ON
RECORD AT PORTLAND.

WARMEST AVERAGE TEMPERATURE FOR OCTOBER (SINCE 1941)...
RANK  TEMP  YEAR
1     56.1  2017 <===
2     55.3  1947
3     54.5  2014
4     53.7  2007
5     52.9  2012
6     52.8  1968
7     52.5  1971
8     52.4  1990
9     52.3  1995
      52.3  1963

A TOTAL OF 5.14 INCHES OF RAIN FELL WHICH WAS 0.27 INCHES ABOVE
NORMAL. THE HEAVIEST RAIN FELL IN THE LAST WEEK OF THE MONTH WHEN
TWO STORM SYSTEMS BROUGHT MORE THAN 4.5 INCHES OF RAIN. THE WETTEST
OCTOBER ON RECORD WAS IN 1996 WHEN 16.86 INCHES OF PRECIPITATION
FELL. THE DRIEST WAS IN 1924 WHEN ONLY 0.09 INCHES WAS OBSERVED.

NO SNOW FELL WHICH IS FAIRLY STANDARD FOR OCTOBER, AS THE NORMAL
VALUE IS ONLY A TRACE. OF THE 137 YEARS OF SNOWFALL RECORDS AT
PORTLAND, MEASURABLE SNOWFALL HAS ONLY OCCURRED IN 12 YEARS, MOST
RECENTLY IN 2011. A TRACE OF SNOW HAS BEEN OBSERVED IN AN ADDITIONAL
37 YEARS, MOST RECENTLY IN 2009. THE MOST SNOWFALL ON RECORD FOR THE
MONTH OF OCTOBER WAS IN 2011 WHEN 5.2 INCHES FELL.

THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN OCTOBER 2017...
DATE  RECORD                                PREVIOUS
8     62 - WARMEST LOW TEMPERATURE          57 IN 2014
8     68 - WARMEST AVERAGE TEMPERATURE      68 IN 1947 /TIED/
9     59 - WARMEST LOW TEMPERATURE          56 IN 1949
11    61 - WARMEST AVERAGE TEMPERATURE      61 IN 1955 /TIED/
24    57 - WARMEST LOW TEMPERATURE          55 IN 2001 AND 1959
25    58 - WARMEST LOW TEMPERATURE          51 IN 1959
25    62 - WARMEST AVERAGE TEMPERATURE      60 IN 1963
29    56 - WARMEST LOW TEMPERATURE          53 IN 2015

$$

KIMBLE


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