Climatological Report (Annual)
Issued by NWS Portland, ME

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CLACON

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CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAY ME
447 PM EST THU JAN 5 2017

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

...THE CONCORD NH CLIMATE SUMMARY FOR THE YEAR OF 2016...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1868 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             102   07/03/1966
                        07/04/1911
 LOW              -37   02/16/1943
HIGHEST            99   08/12        96       3       96  07/29
LOWEST            -13   02/14       -15       2      -21  02/24
AVG. MAXIMUM     61.4              58.0     3.4     59.1
AVG. MINIMUM     37.2              34.8     2.4     34.7
MEAN             49.3              46.4     2.9     46.9
DAYS MAX >= 90     25              11.5    13.5       17
DAYS MAX <= 32     31              45.3   -14.3       56
DAYS MIN <= 32    157             167.0   -10.0      156
DAYS MIN <= 0       8              14.8    -6.8       25

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        57.99   2008
 MINIMUM        24.17   1965
TOTALS          33.07             40.61   -7.54    38.31
DAILY AVG.       0.09              0.11   -0.02     0.11
DAYS >= .01       127             130.9    -3.9      128
DAYS >= .10        72              78.4    -6.4       66
DAYS >= .50        24              27.0    -3.0       24
DAYS >= 1.00        4               9.3    -5.3        7
GREATEST
 24 HR. TOTAL    3.03   10/20 TO 10/21

SNOWFALL (INCHES)
RECORDS
 TOTAL          128.4   1956
TOTALS           49.2              61.4   -12.2     80.0
SINCE 7/1        23.9              17.1     6.8      4.4
SNOWDEPTH AVG.      1
DAYS >= TRACE      44              30.0    14.0       50
DAYS >= 1.0        12              16.2    -4.2       19
GREATEST
 SNOW DEPTH        15   12/30
 24 HR TOTAL      8.3   12/29

DEGREE_DAYS
HEATING TOTAL    6349              7236    -887     7036
 SINCE 7/1       2403              2746    -343     2114
COOLING TOTAL     715               452     263      597

FREEZE DATES
RECORD
 EARLIEST     08/29/1986
 LATEST       06/26/1979
EARLIEST                        09/27
LATEST                          05/14
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              5.9
HIGHEST WIND SPEED/DIRECTION    37/310    DATE  03/17
HIGHEST GUST SPEED/DIRECTION    52/310    DATE  03/17

SKY COVER
AVERAGE SKY COVER           0.40

AVERAGE RH (PERCENT)     64

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM             16     HEAVY RAIN                26
RAIN                     51     LIGHT RAIN               126
FREEZING RAIN             4     LT FREEZING RAIN           7
HEAVY SNOW                8     SNOW                      11
LIGHT SNOW               40     FOG                      170
FOG W/VIS <= 1/4 MILE    57     HAZE                      56

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

$$

THE YEAR 2016 WAS THE WARMEST ON RECORD AT PORTLAND AND THE DRIEST
YEAR SINCE 2001. ALTHOUGH THERE WERE A FEW PERIODS OF EXTREME COLD
IN MID FEBRUARY, APRIL, AND MID DECEMBER, MOST OF THE YEAR WAS
DOMINATED BY WARM WEATHER AND DROUGHT.

IT ALL BEGAN WITH A RELATIVELY WARM JANUARY. ALTHOUGH THERE WERE A
FEW COLD DAYS, MOST OF JANUARY WAS WARMER THAN NORMAL WITH ONLY A
FEW LIGHT SNOWFALLS. ON FEBRUARY 5 A SNOWSTORM BROUGHT 5 INCHES OF
SNOW AND SIGNALED A CHANGE IN THE WEATHER PATTERN. A SERIES OF COLD
FRONTS BROUGHT PROGRESSIVELY COLDER AIR INTO THE AREA WITH A TRULY
ARCTIC AIR MASS IN PLACE FOR THE MIDDLE OF THE MONTH WHEN 4 STRAIGHT
DAYS SAW TEMPERATURES DROP BELOW ZERO. AFTER BOTTOMING OUT AT 12
BELOW ZERO ON FEBRUARY 15, THE TEMPERATURE WARMED ALL THE WAY TO 51
DEGREES THE NEXT DAY WITH SNOW CHANGING TO RAIN AND WARM
TEMPERATURES AGAIN DOMINATING FOR SEVERAL MORE WEEKS. FOR THE FIRST
TIME SINCE 1999 THERE WAS NO SNOW LEFT ON THE GROUND ON THE MORNING
OF MARCH 1, TYPICALLY THE TIME OF YEAR THAT SNOW PACK REACHES ITS
PEAK. BY MARCH 9 THE TEMPERATURE HAD WARMED TO 77 DEGREES. THE
EXTREME WARMTH EVENTUALLY BEGAN TO FADE WITH MORE LIGHT SNOW FALLING
ON MARCH 21 AND MORE TYPICAL SPRING LIKE TEMPERATURES. AFTER ANOTHER
BRIEF WARM UP FOR APRIL 1, MUCH COLDER AIR MOVED IN AGAIN. MORE
LIGHT SNOW CAME ON APRIL 4 WHEN THE HIGH WAS ONLY 26 DEGREES, THE
3RD COLDEST APRIL HIGH TEMPERATURE ON RECORD. THE LOW THE NEXT
MORNING WAS 4 DEGREES ABOVE ZERO, THE COLDEST APRIL LOW TEMPERATURE
ON RECORD AT CONCORD. WHILE THE EXTREME COLD SOON EASED UP, MORE
COOL AIR ARRIVED AT THE END OF APRIL AND CONTINUED THROUGH THE FIRST
HALF OF MAY. THE LAST FREEZE OF THE SEASON WAS MAY 10, JUST A FEW
DAYS EARLIER THAN NORMAL. VERY LITTLE SNOW FELL THIS SNOW SEASON,
AND THIS COMBINED WITH LOWER THAN NORMAL RAINFALL IN APRIL AND MAY
TO CAUSE DROUGHT TO DEVELOP ACROSS THE AREA.

COLDEST TEMPERATURE OBSERVED IN APRIL (1868 TO PRESENT)...
RANK  TEMP  DATE
1       4   APR 5, 2016 <===
2       7   APR 1, 1874
3       8   APR 7, 2003
        8   APR 1, 1969
        8   APR 1, 1964
        8   APR 1, 1923

LOWEST SEASON TOTAL SNOWFALL (1868 TO PRESENT)...
RANK  SNOW  SEASON
1     27.0  1979-80
2     29.1  1988-89
3     29.3  1912-13
4     29.7  2015-16 <===
5     31.5  1929-30

WARMER AIR FINALLY ARRIVED IN MID MAY WITH THE TEMPERATURE FIRST
TOPPING 80 DEGREES ON MAY 12 AND SOARING ALL THE WAY TO 90 ON MAY
25. SOME COOLER TEMPERATURES WERE OBSERVED IN JUNE, BUT THE WARMTH
BEGAN BUILDING AGAIN DURING THE LAST PART OF JUNE AND CONTINUED
THROUGH INDEPENDENCE DAY WITH SEVERAL DAYS TOPPING 90 DEGREES. A
PERIOD OF EASTERLY ONSHORE WINDS BROUGHT UNUSUALLY COOL TEMPERATURES
IN MID JULY, INCLUDING A HIGH OF ONLY 63 ON JULY 9, BUT AS SOON AS
THE WINDS SHIFTED THE WARM WEATHER RETURNED. THE PREVAILING WEATHER
PATTERN FEATURED CONTINENTAL AIR SPILLING INTO NEW ENGLAND WITH
HOTTER THAN NORMAL DAYTIME TEMPERATURES AND NIGHTTIME LOWS NEAR OR
BELOW NORMAL AND VERY LITTLE RAINFALL. THE HOT WEATHER PEAKED IN THE
MIDDLE OF AUGUST WITH A HIGH TEMPERATURE OF 99 DEGREES ON AUGUST 12,
THE 4TH HOTTEST AUGUST TEMPERATURE ON RECORD. ALTHOUGH THE HEAT HAD
PEAKED, THE WARMER THAN NORMAL TEMPERATURES CONTINUED RIGHT THROUGH
THE MIDDLE OF SEPTEMBER. CONCORD FINISHED AS THE 4TH WARMEST SUMMER
ON RECORD.

WARMEST SUMMER (JUN-AUG) AVERAGE TEMPERATURE (1869 TO PRESENT)...
RANK  TEMP  YEAR
1     72.3  1872
2     72.1  1876
3     71.7  1870
4     70.5  2016 <===
5     70.4  1877

BY MID SEPTEMBER THE PERSISTENT DRY WEATHER HAD LED TO INTENSE
DROUGHT. THE DRY CONDITIONS CONTINUED THROUGH MID OCTOBER WITH ONE
EXCEPTION. ON SEPTEMBER 18 AND 19, LOW PRESSURE MOVING ALONG A SLOW
MOVING FRONT BROUGHT 2.27 INCHES OF RAINFALL, THE HEAVIEST
PRECIPITATION AT CONCORD IN ALMOST A YEAR. SOME COOLER WEATHER
FOLLOWED FOR THE LAST WEEK OF SEPTEMBER. THE WARMTH BEGAN TO BUILD
AGAIN IN OCTOBER, EVENTUALLY PEAKING IN MID OCTOBER. ON OCTOBER 21,
TROPICAL MOISTURE SURGED NORTHWARD AHEAD OF A COLD FRONT LEADING TO
VERY HEAVY RAINFALL. MORE THAN 3 INCHES OF RAIN FELL IN JUST A FEW
HOURS WITH A SHIFT TOWARD COOLER, MORE FALL-LIKE TEMPERATURES
AFTERWARDS. A NOR`EASTER BROUGHT ANOTHER 2 INCHES OF RAIN A WEEK
LATER, FURTHER HELPING TO EASE THE DROUGHT CONDITIONS. EVENTUALLY
THE WARMER WEATHER BEGAN TO BUILD AGAIN THROUGH THE MIDDLE OF
NOVEMBER UNTIL A STORM SYSTEM BROUGHT THE FIRST ACCUMULATING
SNOWFALL OF THE SEASON ON NOVEMBER 20 AND 21. COOLER AIR MOVED IN
BEHIND THIS SYSTEM. AFTER A BRIEF WARM UP AT THE BEGINNING OF
DECEMBER, MORE LIGHT SNOW CAME ON DECEMBER 5. SEVERAL MORE LIGHT
SNOWFALLS HELPED TO ESTABLISH A SNOW COVER THAT WOULD LAST THROUGH
THE END OF THE YEAR AND SET THE STAGE FOR A FRIGID EARLY SEASON
ARCTIC AIR MASS TO MOVE INTO THE AREA DURING THE MIDDLE OF THE
MONTH. THREE DAYS SAW THE TEMPERATURE FALL BELOW ZERO IN MID
DECEMBER. THE PATTERN BEGAN TO SHIFT AGAIN ON DECEMBER 21 WHEN THE
BRUTALLY COLD AIR MOVED AWAY AND WARMER WEATHER LASTED THROUGH THE
END OF THE MONTH. CONCORD ENJOYED ITS FIRST WHITE CHRISTMAS IN 3
YEARS. INTENSIFYING LOW PRESSURE MOVING THROUGH THE GULF OF MAINE
BROUGHT MORE THAN 8 INCHES OF SNOWFALL TO CONCORD ON DECEMBER 29,
WITH MOST OF THAT FALLING IN JUST A FEW HOURS THAT EVENING.

THE AVERAGE TEMPERATURE FOR THE YEAR WAS 49.3 DEGREES WHICH WAS 2.9
DEGREES ABOVE NORMAL AND THE WARMEST YEAR ON RECORD AT CONCORD.
UNTIL THIS YEAR, THE WARMEST YEAR WAS IN 1872 WHEN THE AVERAGE
TEMPERATURE WAS 49.2 DEGREES. THE COLDEST WAS 41.1 DEGREES IN 1918.
THE FOLLOWING TABLE LISTS THE WARMEST YEARS ON RECORD AT CONCORD.

WARMEST ANNUAL AVERAGE TEMPERATURE (1869 TO PRESENT)...
RANK  TEMP  YEAR
1     49.3  2016 <===
2     49.2  1878
3     49.1  2012
      49.1  1877
5     48.8  1880
6     48.7  2010
      48.7  1998
8     48.6  1870
9     48.4  2006
10    48.3  1953
      48.3  1881

THE FOLLOWING TABLE LISTS THE AVERAGE TEMPERATURES FOR EACH MONTH OF
2016 INCLUDING DEPARTURES FROM NORMAL.

AVERAGE TEMPERATURES BY MONTH IN 2016
MONTH      MAXIMUM       MINIMUM      AVERAGE      NOTES
JANUARY    35.8 (+5.0)   18.0 (+7.6)  26.9 (+6.3)
FEBRUARY   39.6 (+4.7)   16.9 (+3.1)  28.2 (+3.9)
MARCH      50.6 (+6.8)   28.6 (+6.1)  39.6 (+6.5)  6TH WARMEST
APRIL      58.1 (+0.7)   29.6 (-3.1)  43.8 (-1.3)
MAY        70.5 (+1.6)   44.8 (+2.2)  57.7 (+1.9)
JUNE       79.4 (+2.0)   52.8 (+0.3)  66.1 (+1.2)
JULY       86.0 (+3.7)   59.0 (+1.3)  72.5 (+2.5)
AUGUST     86.9 (+6.0)   58.8 (+2.7)  72.8 (+4.3)  2ND WARMEST
SEPTEMBER  78.0 (+5.4)   50.8 (+3.4)  64.4 (+4.4)  5TH WARMEST
OCTOBER    62.2 (+1.7)   39.3 (+3.5)  50.7 (+2.5)
NOVEMBER   51.7 (+3.3)   30.8 (+2.6)  41.2 (+2.9)
DECEMBER   37.5 (+1.2)   17.6 (+0.4)  27.6 (+0.8)
ANNUAL     61.3 (+3.4)   37.2 (+2.4)  49.3 (+2.9)  WARMEST

CONCORD RANKED IN THE TOP 5 IN NUMBER OF DAYS WITH A HIGH
TEMPERATURE OF 70 DEGREES OR WARMER, 80 DEGREES OR WARMER, AND 90
DEGREES OR WARMER. THE FOLLOWING TABLE LISTS THE NUMBER OF DAYS
WITH A HIGH TEMPERATURE THAT REACHED 70, 80, AND 90 DEGREES.

MAXIMUM TEMPERATURE 70, 80, OR 90 DEGREES OR HIGHER (SINCE 1869)...
      MAX >=70         |  MAX >= 80        |  MAX >= 90
RANK  DAYS  YEAR       |  DAYS  YEAR       |  DAYS  YEAR
1     158   1870       |   97   1870       |   30   1955
2     147   1957       |   95   2016 <===  |   27   1978
3     146   2016 <===  |   87   2015       |   27   1870
4     146   1963       |   85   2012       |   26   2010
5     144   2015       |   84   2010       |   25   2016 <===
6     144   2001       |   83   1959       |   25   2002
7     143   1991       |   82   1947       |   25   1988
8     143   1947       |   81   2011       |   25   1966
9     141   2010       |   81   2007       |   25   1949
10    141   1921       |   81   2005*      |   23   1944

* ALSO OCCURRED IN EARLIER YEARS

A TOTAL OF 33.07 INCHES OF PRECIPITATION FELL WHICH WAS 7.54 INCHES
BELOW NORMAL AND THE DRIEST YEAR SINCE 2001. THE HEAVIEST RAIN FELL
ON OCTOBER 21 AND 22 WHEN 3.12 INCHES WAS MEASURED. THE DRIEST YEAR
ON RECORD WAS IN 1965 WHEN ONLY 24.17 INCHES FELL. THE WETTEST WAS
IN 2008 WITH 57.99 INCHES. THE FOLLOWING TABLE LISTS THE
PRECIPITATION AND SNOWFALL AMOUNTS FOR EACH MONTH OF 2016 INCLUDING
DEPARTURES FROM NORMAL.

MONTHLY PRECIPITATION AND SNOWFALL TOTALS FOR 2016
MONTH      PRECIPITATION   SNOWFALL      NOTES
JANUARY    1.36  (-1.34)    7.6 (-10.5)
FEBRUARY   4.39  (+1.77)   12.7  (+0.4)
MARCH      2.67  (-0.60)    2.3  (-8.8)
APRIL      1.65  (-1.76)    2.7  (-0.1)
MAY        2.63  (-1.03)    0.0
JUNE       1.41  (-2.28)    0.0
JULY       2.18  (-1.56)    0.0
AUGUST     1.89  (-1.29)    0.0
SEPTEMBER  2.94  (-0.44)    0.0
OCTOBER    6.26  (+2.22)    0.0
NOVEMBER   2.37  (-1.35)    0.7  (-1.9)
DECEMBER   3.32  (+0.12)   23.2  (+8.7)
ANNUAL     33.07 (-7.54)   49.2 (-12.2)

THERE WERE ONLY 4 DAYS THAT RECORDED AT LEAST 1.00 INCH OF
PRECIPITATION. THIS IS 6.8 DAYS BELOW NORMAL AND THE FEWEST SINCE
1992 (1 DAY). THE FOLLOWING TABLE LISTS THE DAYS WHICH RECEIVED AT
LEAST 1.00 INCH OF PRECIPITATION IN 2016.

DAYS WITH AT LEAST 1.00 INCH OF PRECIPITATION IN 2016...
DAY           PRECIPITATION
FEBRUARY 24   1.18
SEPTEMBER 19  2.15
OCTOBER 21    3.01
OCTOBER 28    1.44

SNOWFALL STATISTICS ARE NORMALLY LISTED BY SEASON RATHER THAN BY
CALENDAR YEAR. HOWEVER, 2016 SAW 49.2 INCHES OF SNOW WHICH WAS 12.2
INCHES BELOW NORMAL. THE HEAVIEST SNOWSTORM WAS ON DECEMBER 29 WHEN
8.3 INCHES WAS MEASURED. THERE WERE 12 DAYS THAT MEASURED AT LEAST
1.0 INCH OF SNOWFALL, THE FEWEST SINCE 2010. ONLY 1 DAY MEASURED AT
LEAST 6 INCHES, THE FEWEST SINCE 2010.

DAYS WITH AT LEAST 6 INCHES OF SNOWFALL IN 2016...
DAY           SNOWFALL
DECEMBER 29   8.3

SNOW DEPTH REACHED ITS PEAK ON DECEMBER 30 WHEN 15 INCHES OF SNOW
WAS ON THE GROUND. THE PREVIOUS WINTER SNOW PACK TOPPED OUT AT ONLY
8 INCHES ON FEBRUARY 16. WARM WEATHER AND INFREQUENT LIGHT SNOWFALL
PREVENTED THE WINTER SNOW PACK FROM BUILDING. THE MOST CONSECUTIVE
DAYS WITH AT LEAST 1 INCH OF SNOW ON THE GROUND WAS 60 DAYS, ENDING
ON FEBRUARY 26. SNOW AGAIN COVERED THE GROUND FOR THE FINAL 26 DAYS
OF 2016, ALREADY SURPASSING LAST SEASON`S HIGHEST DEPTH. THERE WERE
A TOTAL OF 87 DAYS WITH AT LEAST 1 INCH OF SNOW ON THE GROUND, ABOUT
8 DAYS MORE THAN NORMAL. THERE WERE ONLY 21 DAYS WITH AT LEAST 6
INCHES ON THE GROUND WHICH IS 22 DAYS FEWER THAN NORMAL. JUST 2 DAYS
RECORDED 12 INCHES OR MORE ON THE GROUND, 17 DAYS FEWER THAN NORMAL.

THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN 2016...
JAN 10  54   - WARMEST HIGH TEMPERATURE      54 IN 1939 /TIED/
MAR 9   77   - WARMEST HIGH TEMPERATURE      67 IN 2000
APR 1   77   - WARMEST HIGH TEMPERATURE      77 IN 1986 /TIED/
APR 4   26   - COLDEST HIGH TEMPERATURE      27 IN 1879
APR 5   4    - COLDEST LOW TEMPERATURE       10 IN 1954
APR 6   11   - COLDEST LOW TEMPERATURE       14 IN 1943 AND OTHERS
MAY 31  94   - WARMEST HIGH TEMPERATURE      94 IN 2013 /TIED/
AUG 12  99   - WARMEST HIGH TEMPERATURE      99 IN 1944 /TIED/
SEP 19  2.15 - GREATEST PRECIPITATION        1.45 IN 1938
OCT 21  3.01 - GREATEST PRECIPITATION        2.48 IN 1996

**NOTE**
POTENTIAL UNCERTAINTY EXISTS REGARDING THE PRELIMINARY CONCORD NH
TEMPERATURE DATA FOR 2016. AN ANALYSIS COMPARING SURROUNDING SITES
SHOWS A SLIGHT WARM BIAS FOR ABOUT HALF OF THE YEAR WHICH MAY HAVE
IMPACTED THE RESULTING ANNUAL TEMPERATURE. TO DATE EQUIPMENT
CALIBRATION CHECKS HAVE BEEN PERFORMED THAT INDICATE THE SENSOR WAS
WITHIN TOLERANCE. WE WILL CONTINUE TO ANALYZE BOTH POSSIBLE
ENVIRONMENTAL AND EQUIPMENT FACTORS TO SEE IF A DEFINITE CAUSE FOR
THIS TEMPERATURE SIGNAL CAN BE DETERMINED. IF NEEDED THE DATA WILL
BE REVISED.

$$

KIMBLE



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