Climatological Report (Monthly)
Issued by NWS Portland, ME

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CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAY ME
700 AM EDT TUE JUN 2 2020

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

...THE CONCORD NH CLIMATE SUMMARY FOR THE MONTH OF MAY 2020...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1868 TO 2020

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              98   05/22/1911
 LOW               21   05/03/1966
                        05/10/1947
HIGHEST            91   05/27        89       2       85  05/26
LOWEST             28   05/14        28       0       30  05/09
                        05/06
AVG. MAXIMUM     69.6              68.9     0.7     65.0
AVG. MINIMUM     42.5              42.6    -0.1     44.3
MEAN             56.1              55.8     0.3     54.6
DAYS MAX >= 90      1               0.6     0.4        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      5               3.5     1.5        1
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        11.09   2006
 MINIMUM         0.32   1899
TOTALS           1.90              3.66   -1.76     3.13
DAILY AVG.       0.06              0.12   -0.06     0.10
DAYS >= .01         6              12.4    -6.4       15
DAYS >= .10         5               7.1    -2.1        9
DAYS >= .50         2               2.4    -0.4        2
DAYS >= 1.00        0               0.7    -0.7        0
GREATEST
 24 HR. TOTAL    0.72   05/01

SNOWFALL (INCHES)
RECORDS
 TOTAL            5.0   1945
TOTALS            0.4               0.0     0.4      0.0
SINCE 7/1        46.5              61.4   -14.9     52.8
SNOWDEPTH AVG.      0
DAYS >= TRACE       1               0.0     1.0        0
DAYS >= 1.0         0               0.0     0.0        0
GREATEST
 SNOW DEPTH         T   05/09
 24 HR TOTAL      0.4   05/09

DEGREE_DAYS
HEATING TOTAL     309               303       6      323
 SINCE 7/1       6771              7150    -379     7147
COOLING TOTAL      42                16      26       11
 SINCE 1/1         42                18      24       14
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              7.8
HIGHEST WIND SPEED/DIRECTION    33/300    DATE  05/09
HIGHEST GUST SPEED/DIRECTION    46/300    DATE  05/09

SKY COVER
AVERAGE SKY COVER           0.40

AVERAGE RH (PERCENT)     58

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

&&

MAY BEGAN WITH SOME RAINFALL AS LOW PRESSURE TRACKED JUST OFFSHORE,
HOWEVER THE REST OF THE MONTH WAS MOSTLY DRY. A SERIES OF COLD
FRONTS KEPT A SUPPLY OF DRY AIR FLOWING OUT OF CANADA INTO NEW
ENGLAND, ONLY OCCASIONALLY BROKEN UP BY BRIEF WARM UPS. THE MOST
MEMORABLE THING FROM THIS MONTH WAS THE SNOW THAT FELL ON MAY 9. THE
COOL, DRY AIR MASS WHICH WAS IN PLACE INTERACTED WITH LOW PRESSURE
TRACKING OFFSHORE TO CHANGE RAIN TO SNOW ON THE MORNING OF MAY 9. A
TOTAL OF 0.4 INCHES WAS MEASURED. THIS WAS THE THIRD LATEST
MEASURABLE SNOWFALL ON RECORD AT CONCORD. IT REMAINED COOL FOR ABOUT
ANOTHER WEEK BEFORE SOME MORE MILD WEATHER RETURNED. HALF AN INCH OF
RAIN FELL ON THE 15TH, BUT THIS WOULD BE THE LAST SIGNIFICANT
RAINFALL OF THE MONTH AS THE PARADE OF COLD FRONTS KEPT A FLOW OF
DRY CANADIAN AIR WITH A FEW EXCEPTIONS. WHILE THE CANADIAN COLD
FRONTS BROUGHT COOL, DRY AIR, MUCH WARMER AIR WAS BUILDING OVER THE
MIDDLE OF THE COUNTRY. THIS BRIEFLY SPILLED INTO NEW ENGLAND ON MAY
21 AND 22 WHEN CONCORD WARMED INTO THE 80S. IT ARRIVED AGAIN WITH AN
EVEN LONGER STRETCH OF SUMMER-LIKE WARMTH FROM THE 26TH THROUGH THE
30TH, WITH THE HOTTEST TEMPERATURE REACHING 91 DEGREES ON THE 27TH.

THE AVERAGE TEMPERATURE FOR THE MONTH WAS 56.1 DEGREES WHICH WAS 0.3
DEGREES ABOVE NORMAL. DAYTIME HIGHS WERE ABOVE NORMAL WHILE
NIGHTTIME LOWS WERE BELOW NORMAL, A SIGN OF THE DRY AIR THAT EXISTED
FOR MOST OF THE MONTH. THE WARMEST MAY WAS IN 1880 WHEN THE AVERAGE
TEMPERATURE WAS 64.4 DEGREES. THE COOLEST WAS IN 1917 WHEN IT WAS
ONLY 47.6 DEGREES.

A TOTAL OF 1.90 INCHES OF PRECIPITATION FELL WHICH WAS 1.76 INCHES
BELOW NORMAL. THE HEAVIEST PRECIPITATION WAS ON MAY 1 WHEN 0.72
INCHES WAS RECORDED. THE DRIEST MAY WAS IN 1899 WHEN ONLY 0.32
INCHES WAS MEASURED. THE WETTEST WAS IN 2006 WITH 11.09 INCHES.

THERE WAS 0.4 INCHES OF SNOWFALL WHICH FELL ON MAY 9. MEASURABLE
SNOWFALL IS QUITE RARE IN MAY, HAVING ONLY OCCURRED 7 TIMES IN THE
153 YEAR HISTORY OF SNOWFALL OBSERVATIONS AT CONCORD. THE LAST TIME
MEASURABLE SNOW OCCURRED IN MAY WAS IN 1966. A TRACE OF SNOWFALL HAS
BEEN OBSERVED IN MAY IN AN ADDITIONAL 24 YEARS, MOST RECENTLY IN
2002. THE SNOWIEST MAY WAS IN 1945 WHEN 5.0 INCHES FELL. THE
FOLLOWING TABLE LISTS ALL THE SNOWSTORMS WHICH HAVE OCCURRED IN THE
MONTH OF MAY.

MAY SNOWSTORMS (SINCE 1868)...
RANK  SNOWFALL  DATES
1       5.0     MAY 10-11, 1945
2       2.6     MAY 2, 1917
3       2.0     MAY 1-2, 1869
4       1.1     MAY 8, 1966
5       0.5     MAY 13, 1914
6       0.4     MAY 9, 2020  <===
7       0.2     MAY 2, 1941

THE FOLLOWING RECORDS WERE SET OR TIED IN MAY 2020...
DATE  RECORD                                PREVIOUS
9     42   - COOLEST HIGH TEMPERATURE       43 IN 1966
9     0.4  - MOST SNOWFALL                  TRACE IN 1977 AND 1966
29    70   - WARMEST LOW TEMPERATURE        64 IN 1987

$$

KIMBLE


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