Climatological Report (Seasonal)
Issued by NWS Portland, ME

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CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAY ME
417 AM EDT SUN MAR 11 2018

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

...THE PORTLAND ME CLIMATE SUMMARY FOR THE WINTER SEASON, FROM
12/1/2017 TO 2/28/2018...

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              71   12/06/2001
                        12/07/1998
 LOW              -39   02/16/1943
HIGHEST            68   02/21        59       9       55  02/19
LOWEST            -17   01/01       -10      -7       -3  12/16
AVG. MAXIMUM     34.2              34.3    -0.1     37.3
AVG. MINIMUM     17.0              16.8     0.2     20.5
MEAN             25.6              25.6     0.0     28.9
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     39              37.0     2.0       22
DAYS MIN <= 32     85              82.9     2.1       79
DAYS MIN <= 0      10               7.6     2.4        1

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        20.49   1935
 MINIMUM         4.12   1872
TOTALS          11.09             10.65    0.44    13.51
DAILY AVG.       0.13              0.12    0.01     0.15
DAYS >= .01        37              32.3     4.7       39
DAYS >= .10        26              19.5     6.5       27
DAYS >= .50         9               7.0     2.0        9
DAYS >= 1.00        0               2.7    -2.7        5
GREATEST
 24 HR. TOTAL    0.96   02/07

SNOWFALL (INCHES)
RECORDS
 TOTAL          107.6   1971
TOTALS           58.1              44.5    13.6     65.7
SINCE 7/1        58.2              46.4    11.8     66.2
SNOWDEPTH AVG.      4
DAYS >= TRACE      36              20.1    15.9       34
DAYS >= 1.0        12              11.5     0.5       14
GREATEST
 SNOW DEPTH        16   01/06
                        01/05
 24 HR TOTAL     12.0   01/04 TO 01/05

DEGREE_DAYS
HEATING TOTAL    3539              3550     -11     3226
 SINCE 7/1       4704              5042    -338     4478
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0        0
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              7.7
HIGHEST WIND SPEED/DIRECTION    37/300    DATE  01/04
HIGHEST GUST SPEED/DIRECTION    52/310    DATE  01/04

SKY COVER
AVERAGE SKY COVER           0.60

AVERAGE RH (PERCENT)     71


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

&&

AFTER COLD WEATHER HAD LASTED MUCH OF NOVEMBER, THIS COLD BEGAN TO
EASE UP A BIT AS THE CALENDAR CHANGED TO DECEMBER. THE FIRST WEEK
SAW TEMPERATURES WARMING INTO THE 40S AND EVEN THE 50S. BUT THIS
BRIEF BREAK FROM THE COLD WAS NOT GOING TO LAST. THE FIRST
SIGNIFICANT SNOWSTORM OF THE SEASON ARRIVED ON DECEMBER 9 WHEN MORE
THAN 6 INCHES OF SNOW FELL. COLDER TEMPERATURES SOON BECAME THE NEW
NORMAL WITH THE NEXT SEVERAL STORM SYSTEMS BRINGING SNOW FOLLOWED BY
FREEZING RAIN. THE NEXT SIGNIFICANT SNOWSTORM ARRIVED CHRISTMAS
MORNING WITH 5 INCHES OF SNOW FALLING IN JUST A FEW HOURS. BRUTALLY
COLD ARCTIC AIR POURED INTO NEW ENGLAND BEHIND THIS STORM. THE
TEMPERATURE DID NOT RISE ABOVE 15 DEGREES AGAIN FOR 7 STRAIGHT DAYS,
THE LONGEST SUCH STRETCH ON RECORD AT PORTLAND. THE TEMPERATURE FELL
BELOW ZERO MOST NIGHTS, WITH THE LOW TEMPERATURE OF 17 BELOW ZERO ON
JANUARY 1 BEING THE COLDEST TEMPERATURE OBSERVED AT PORTLAND SINCE
1994. DURING THE MIDST OF THIS BRUTAL COLD SPELL, AN INTENSE STORM
SYSTEM BROUGHT 12 INCHES OF SNOW ON JANUARY 4. THIS STORM WAS
ACCOMPANIED BY 52 MPH WIND GUSTS CREATING BLIZZARD CONDITIONS. A
REINFORCING SHOT OF BRUTAL COLD POURED IN AGAIN AFTER THIS STORM.
FINALLY THE INTENSE COLD BEGAN TO BREAK AND THE TEMPERATURE ROSE
ABOVE FREEZING AGAIN FOR THE FIRST TIME ON JANUARY 9, JUST AS THE
JANUARY THAW BEGAN. THE NEXT 4 DAYS BROUGHT WARMING TEMPERATURES.
THE TEMPERATURE PEAKED AT 50 DEGREES ON THE 13TH AS WARM AIR AND
HEAVY RAINFALL SURGED NORTHWARD AHEAD OF A STRONG COLD FRONT. THIS
WARM WEATHER AND RAINFALL WASHED AWAY MUCH OF THE EARLY SEASON SNOW
COVER. THE STRONG COLD FRONT BROUGHT A RETURN TO VERY COLD WEATHER
FOR A FEW DAYS, THOUGH THIS COLD SPELL WAS NOT AS INTENSE OR AS LONG
LASTING AS THE LAST ONE. MORE SNOW FELL ON JANUARY 17TH,
REPLENISHING THE EARLY SEASON SNOW COVER. FOR THE NEXT FEW WEEKS THE
TEMPERATURE GRADUALLY BEGAN WARMING AGAIN, THOUGH SOME COLDER AIR
RETURNED AT THE END OF JANUARY INTO THE BEGINNING OF FEBRUARY. THE
COLDEST TEMPERATURE FROM THIS COLDER SPELL WAS 2 DEGREES ON FEBRUARY
3. ULTIMATELY THIS PROVED TO BE THE LAST SIGNIFICANT COLD SPELL OF
THE WINTER. MUCH OF FEBRUARY SAW WARMING TEMPERATURES WITH JUST
ENOUGH PERIODIC WINTRY SET BACKS TO KEEP A SMALL AMOUNT OF SNOW ON
THE GROUND. THE TWO BIGGEST SNOWSTORMS CAME ON FEBRUARY 7 AND 18
WITH EACH ONE BRINGING MORE THAN 6 INCHES OF SNOW. THE GRADUAL
WARMING INTENSIFIED IN THE LAST PART OF THE MONTH AS A RIDGE OF HIGH
PRESSURE BROUGHT WARM AIR FROM THE SOUTHERN UNITED STATES INTO NEW
ENGLAND. THIS WARMTH PEAKED WITH A TEMPERATURE OF 68 DEGREES ON
FEBRUARY 21, THE WARMEST TEMPERATURE EVER OBSERVED IN THE MONTH OF
FEBRUARY. ALTHOUGH A COLD FRONT THAT EVENING BROUGHT COOLER
TEMPERATURES BACK INTO THE AREA, THE REST OF THE MONTH REMAINED
ABOVE NORMAL WITH SEVERAL DAYS REACHING THE 50S. BY THE END OF THE
FEBRUARY THE WINTER SNOW PACK HAD MELTED.

THE AVERAGE TEMPERATURE FOR THE SEASON WAS 25.6 DEGREES WHICH WAS
EXACTLY NORMAL. THE WARMEST WINTER WAS IN 2002 WHEN THE AVERAGE
TEMPERATURE WAS 31.3 DEGREES. THE COLDEST WAS IN 1971 WHEN IT WAS
ONLY 17.9 DEGREES.

THE NEW YEARS COLD SPELL WAS ONE OF THE MOST INTENSE ON RECORD AT
PORTLAND. IT FEATURED 15 STRAIGHT DAYS OF SUBFREEZING TEMPERATURES
INCLUDING A RECORD 7 STRAIGHT DAYS THAT DID NOT WARM ABOVE 15
DEGREES. THE FOLLOWING TABLE LISTS THE LONGEST STRETCHES OF
TEMPERATURES 15 DEGREES OR COLDER AT PORTLAND.

MOST CONSECUTIVE DAYS MAX OF 15 DEGREES OR COLDER (SINCE 1940)...
RANK  DAYS  DATES
1      7    DEC 27, 2017 TO JAN 2, 2018 <===
2      6    FEB 10 TO 15, 1979
3      5    JAN 16 TO 20, 1971
4      4    FEB 1 TO 4, 1971
5      3*   JAN 21 TO 23, 2003
* MOST RECENT OF SEVERAL OCCURRENCES

THE 68 DEGREES THAT WAS RECORDED ON FEBRUARY 21 WAS THE WARMEST
TEMPERATURE EVER RECORDED IN THE MONTH OF FEBRUARY, AND ONE OF THE
WARMEST OF ANY WINTER SEASON. THE FOLLOWING TABLE LISTS THE WARMEST
TEMPERATURES ON RECORD FOR THE WINTER SEASON AT PORTLAND INCLUDING
EVERY OCCURRENCE OF 65 DEGREES.

WARMEST TEMPERATURE IN WINTER (SINCE 1940)...
RANK  DAYS  DATE
1      71   DEC 6, 2001
       71   DEC 7, 1998
3      69   DEC 4, 1982
4      68   FEB 21, 2018 <===
       68   DEC 3, 2009
6      67   JAN 6, 2007
7      66   DEC 1, 2001
       66   DEC 23, 1990
9      65   DEC 4, 1998

A TOTAL OF 11.09 INCHES OF PRECIPITATION FELL WHICH WAS 0.44 INCHES
ABOVE NORMAL. THE HEAVIEST PRECIPITATION FELL ON JANUARY 12 AND 13
WHEN 1.31 INCHES FELL. THE WETTEST WINTER ON RECORD WAS IN 1934-35
WHEN 20.49 INCHES FELL. THE DRIEST WAS IN 1872 WHEN ONLY 4.12 INCHES
WAS MEASURED.

THERE WAS 58.1 INCHES OF SNOWFALL WHICH WAS 13.6 INCHES ABOVE
NORMAL. THE HEAVIEST SNOW FELL ON JANUARY 4 AND 5 WHEN 12.0 INCHES
OF SNOWFALL WAS MEASURED DURING A BLIZZARD. THE SNOWIEST WINTER WAS
IN 1970-71 WHEN 107.6 INCHES FELL. THE LEAST SNOWY WINTER WAS IN
1936-37 WHEN ONLY 9.5 INCHES FELL.

THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN WINTER 2017/18...
DATE    RECORD                               PREVIOUS
DEC 28  8   - COLDEST HIGH TEMPERATURE       11 IN 1946
DEC 28  1   - COLDEST AVERAGE TEMPERATURE    2 IN 1951
DEC 29  6   - COLDEST HIGH TEMPERATURE       13 IN 1993
DEC 29  -13 - COLDEST LOW TEMPERATURE        -9 IN 1963
DEC 29  -3  - COLDEST AVERAGE TEMPERATURE    5 IN 1989
DEC 30  12  - COLDEST HIGH TEMPERATURE       13 IN 1963
JAN 1   10  - COLDEST HIGH TEMPERATURE       13 IN 1957
JAN 1   -17 - COLDEST LOW TEMPERATURE        -12 IN 1964 & 1957
JAN 1   -3  - COLDEST AVERAGE TEMPERATURE    1 IN 1957
JAN 2   12  - COLDEST HIGH TEMPERATURE       12 IN 2014 /TIED/
JAN 2   -2  - COLDEST AVERAGE TEMPERATURE    -2 IN 1968 /TIED/
JAN 6   4   - COLDEST HIGH TEMPERATURE       10 IN 1959
JAN 6   0   - COLDEST AVERAGE TEMPERATURE    2 IN 1996
JAN 7   -12 - COLDEST LOW TEMPERATURE        -10 IN 1941
JAN 7   1   - COLDEST AVERAGE TEMPERATURE    5 IN 1996
JAN 12  39  - WARMEST LOW TEMPERATURE        39 IN 2017
FEB 18  5   - SMALLEST TEMPERATURE RANGE     5 IN 1950 /TIED/
FEB 21  68  - WARMEST HIGH TEMPERATURE       59 IN 1953
FEB 21  52  - WARMEST AVERAGE TEMPERATURE    49 IN 1953

$$

KIMBLE


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