Climatological Report (Monthly)
Issued by NWS Portland, ME

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CXUS51 KGYX 042316
CLMCON

PWMCLMCON 000
TTAA00 GYX 020949

CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAY ME
548 AM EDT FRI JUN 02 2023

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

...THE CONCORD NH CLIMATE SUMMARY FOR THE MONTH OF MAY 2023...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1868 TO 2023

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   05/28         89       2       93  05/22
LOWEST            25   05/18         28      -3       28  05/09
AVG. MAXIMUM    71.3               69.3     2.0     73.3
AVG. MINIMUM    40.3               44.1    -3.8     46.1
MEAN            55.8               56.7    -0.9     59.7
DAYS MAX >= 90     1                1.0     0.0        2
DAYS MAX <= 32     0                0.0     0.0        0
DAYS MIN <= 32     3                3.2    -0.2        4
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM       11.09   2006
 MINIMUM        0.32   1899
TOTALS          2.68               3.47   -0.79     2.99
DAILY AVG.      0.09               0.11   -0.02     0.10
DAYS >= .01        8               12.4    -4.4        8
DAYS >= .10        5                7.3    -2.3        7
DAYS >= .50        3                2.2     0.8        2
DAYS >= 1.00       0                0.5    -0.5        0
GREATEST
 24 HR. TOTAL   0.89   05/20

SNOWFALL (INCHES)
RECORDS
 TOTAL           5.0   1945
TOTALS           0.0                0.0     0.0      0.0
SINCE 7/1       64.5               67.7    -3.2     44.6
SNOWDEPTH AVG.     0
DAYS >= TRACE      0                0.0     0.0        0
DAYS >= 1.0        0                0.0     0.0        0
GREATEST
 SNOW DEPTH        0
 24 HR TOTAL       0

DEGREE DAYS
HEATING TOTAL    279                278       1      214
 SINCE 7/1      6167               6909    -742     6396
COOLING TOTAL      5                 20     -15       56
 SINCE 1/1         9                 22     -13       56
................................................................

WIND (MPH)
AVERAGE WIND SPEED              6.4
HIGHEST WIND SPEED/DIRECTION    28/190    DATE  05/02
HIGHEST GUST SPEED/DIRECTION    42/220    DATE  05/01

SKY COVER
AVERAGE SKY COVER           0.25

AVERAGE RH (PERCENT)     62

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              1     HEAVY RAIN                 2
RAIN                      5     LIGHT RAIN                 8
FREEZING RAIN             0     LT FREEZING RAIN           0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     FOG                       10
FOG W/VIS <= 1/4 MILE     1     HAZE                       0

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

&&

THE COOL, CLOUDY, AND DAMP PATTERN THAT DOMINATED THE SECOND HALF OF
APRIL PERSISTED INTO THE FIRST WEEK OF MAY. A SIGNIFICANT RAIN EVENT
THAT STARTED ON APRIL 30TH CONTINUED INTO MAY 1ST WHERE THE CONCORD
AREA RECEIVED 1.38 INCHES OF RAIN WITH UPWARDS OF 2 TO 4 INCHES
FALLING ACROSS THE MOUNTAINS AND CENTRAL NEW HAMPSHIRE LEADING TO
SOME FLOODING. THE CONCORD AREA WENT ON TO RECORD MEASURABLE
PRECIPITATION FOR THE NEXT THREE DAYS OF THE MONTH WITH TEMPERATURES
AVERAGING BELOW NORMAL. THE BLOCKING PATTERN ASSOCIATED WITH THE
NEGATIVE PHASE OF THE NAO WAS RESPONSIBLE FOR THIS PROLONGED PERIOD
OF DREARY WEATHER, AND THIS PATTERN BROKE DOWN BY THE END OF THE
FIRST WEEK OF MAY. A PERIOD OF DRY WEATHER ENSUED, AND WITH THE
EXCEPTION OF A COUPLE COOL DAYS AND SEASONABLY COLD NIGHTS,
TEMPERATURES AVERAGED ABOVE NORMAL THROUGH THE MIDDLE OF THE MONTH.
TOWARDS THE END OF THIS DRY STRETCH OF WEATHER A COLD FRONT CROSSED
ON THE 17TH WITH A CANADIAN HIGH PRESSURE SYSTEM BUILDING IN BEHIND
THE FRONT. THIS HIGH ALLOWED FOR STRONG RADIATIONAL COOLING WITH THE
LAST FREEZE OF THE SEASON OCCURING ON THE MORNING OF THE 18TH WHEN
THE LOW TEMPERATURE DROPPED TO 25 DEGREES. A COUPLE DAYS LATER A
COASTAL LOW PRESSURE SYSTEM MERGED WITH A COLD FRONT APPROACHING
FROM THE WEST BRINGING SIGNIFICANT RAINFALL TO THE CONCORD AREA WHEN
A STORM TOTAL OF 0.89 INCHES FELL ON THE 20TH. COOL WEATHER FOLLOWED
THIS HEAVY RAIN EVENT BEFORE A RIDGE OF HIGH PRESSURE BUILT IN OVER
THE NORTHEAST RESULTING IN VERY WARM WEATHER TO CLOSE OUT THE MONTH
OF MAY.

THE AVERAGE TEMPERATURE FOR THE MONTH WAS 55.8 DEGREES, WHICH WAS
0.9 DEGREES BELOW NORMAL. THE COOLEST MAY ON RECORD WAS IN 1917 WHEN
THE AVERAGE TEMPERATURE WAS 47.6 DEGREES. THE WARMEST MAY ON RECORD
WAS IN 1880 WHEN THE AVERAGE TEMPERATURE WAS 64.4 DEGREES.

A TOTAL OF 2.68 INCHES OF PRECIPITATION FELL, WHICH WAS 0.79 INCHES
BELOW NORMAL. THE DRIEST MAY ON RECORD WAS IN 1899 WHEN ONLY 0.32
INCHES OF PRECIPITATION FELL. THE WETTEST WAS 11.09 INCHES IN 2006.

NO RECERDS WERE SET OR TIED DURING THE MONTH OF MAY AT CONCORD.

$$

DS


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