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CXUS51 KGYX 031129
CLSCON

PWMCLSCON 000
TTAA00 GYX 011114

CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAY ME
714 AM EDT FRI SEP 01 2023

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

...THE CONCORD NH CLIMATE SUMMARY FOR THE SUMMER SEASON, FROM
6/1/2023 TO 8/31/2023...

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            102   07/03/1966
                       07/04/1911
 LOW              29   08/31/1965
HIGHEST           94   06/02         95      -1       98  08/04
LOWEST            45   06/09         37       8       41  06/20
                       06/11
                       08/02
AVG. MAXIMUM    79.3               80.8    -1.5     82.8
AVG. MINIMUM    57.8               56.7     1.1     57.1
MEAN            68.6               68.8    -0.2     70.0
DAYS MAX >= 90     6               11.6    -5.6       24
DAYS MAX <= 32     0                0.0     0.0        0
DAYS MIN <= 32     0                0.0     0.0        0
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM       20.49   1897
 MINIMUM        2.74   1999
TOTALS         15.52              11.02    4.50     9.81
DAILY AVG.      0.17               0.12    0.05     0.11
DAYS >= .01       36               33.6     2.4       31
DAYS >= .10       27               20.0     7.0       19
DAYS >= .50       12                7.3     4.7        8
DAYS >= 1.00       5                2.8     2.2        2
GREATEST
 24 HR. TOTAL   1.53   07/16

SNOWFALL (INCHES)
RECORDS
 TOTAL           0.0
TOTALS           0.0                0.0     0.0      0.0
SINCE 7/1        0.0                0.0     0.0      0.0
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     0.0

DEGREE DAYS
HEATING TOTAL     98                103      -5       75
 SINCE 7/1        18                 29     -11        2
COOLING TOTAL    459                453       6      561
 SINCE 1/1       468                475      -7      617
................................................................

WIND (MPH)
AVERAGE WIND SPEED              4.5
HIGHEST WIND SPEED/DIRECTION    26/300    DATE  06/14
HIGHEST GUST SPEED/DIRECTION    39/240    DATE  06/14

SKY COVER
AVERAGE SKY COVER           0.47

AVERAGE RH (PERCENT)     77

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM             20     HEAVY RAIN                18
RAIN                     22     LIGHT RAIN                42
FREEZING RAIN             0     LT FREEZING RAIN           0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     FOG                       64
FOG W/VIS <= 1/4 MILE    16     HAZE                       6

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

THE WEATHER PATTERN FOR MUCH OF THE SUMMER WAS UNSETTLED IN THE
CONCORD AREA. MORE OFTEN THAN NOT A TROUGH OF LOW PRESSURE WAS IN
THE VICINITY OF THE NORTHEAST WHICH LED TO FREQUENT PRECIPITATION
EVENTS. MANY OF THESE PRECIPITATION EVENTS INVOLVED VERY HEAVY RAIN
ACROSS NEW HAMPSHIRE AND MAINE WITH WFO GYX ISSUING MORE FLASH FLOOD
WARNINGS WITHIN THE FORECAST AREA THAN ANY OTHER YEAR. WHILE THE
CONCORD AREA DID SEE SOME HEAVY RAIN EVENTS, THESE FLASH FLOODING
EVENTS GENERALLY MISSED THE CONCORD AREA. AFTER A WARM START TO THE
SUMMER, TEMPERATURES TOOK A TUMBLE WELL BELOW NORMAL WHEN A COLD
FRONT DROPPED SOUTH THROUGH THE REGION ON JUNE 3RD WITH HIGHS ON THE
3RD AND 4TH ONLY IN THE 50S. IT WAS ALSO DURING THE BEGINNING OF
JUNE WHEN THE NAO DROPPED INTO NEGATIVE TERRITORY WHILE THE PNA
TURNED POSITIVE. THESE TELECONNECTIONS FAVORED A PATTERN OF UPPER
LOWS LINGERING OVER NEW ENGLAND AS A BLOCKING RIDGE OVER EASTERN
CANADA INHIBITED THE EASTWARD PROGRESSION OF THESE SYSTEMS. THIS
PATTERN RESULTED IN TEMPERATURES RUNNING BELOW NORMAL FOR THE MONTH
OF JUNE ALONG WITH 14 DAYS OF THE MONTH RECORDING MEASURABLE
PRECIPITATION AND 21 DAYS WITH FOG. WHEN IT WASN`T RAINING IN JUNE
IT WAS OFTEN CLOUDY WITH THIS JUNE EXPERIENCING THE HIGHEST
FREQUENCY OF OVERCAST SKIES DURING THE MIDDLE OF THE DAY. WHILE THE
NAO DID TREND TOWARDS NEUTRAL DURING THE SECOND HALF OF JUNE THE
POSITIVE PNA HELPED TO MAINTAIN THE UNSETTLED PATTERN THROUGH THE
END OF THE MONTH. THE NAO TURNED SHARPLY NEGATIVE IN EARLY JULY AND
STAYED THERE THROUGH THE MIDDLE OF THE MONTH. THIS CONTINUED THE
UNSETTLED PATTERN THROUGH MUCH OF JULY WITH FRONTAL SYSTEMS OFTEN
STALLING OVER THE AREA DUE TO A DOWNSTREAM BLOCKING RIDGE NEAR
LABRADOR CANADA. THE CONCORD AREA OFTEN STAYED ON THE WARM AND HUMID
SIDE OF THESE FRONTS RESULTING IN THREE WEEKS WHERE THE LOW
TEMPERATURE DID NOT DROP BELOW 60 DEGREES WITH A FEW NIGHTS WHEN THE
LOW DID NOT DROP BELOW 70 DEGREES. AT THE END OF JULY THE NAO
TRENDED TOWARDS NEUTRAL ALLOWING FOR FRONTAL SYSTEMS TO SWEEP ACROSS
NEW ENGLAND BRINGING COOLER AND DRIER AIR INTO THE CONCORD AREA. THE
THEME OF FREQUENT PRECIPITATION EVENTS CONTINUED THROUGH AUGUST.
DURING THE FIRST HALF OF AUGUST THE NAO REMAINED NEGATIVE WHILE THE
PNA REMAINED POSITIVE WITH THESE TELECONNECTIONS FAVORING A TROUGH
JUST WEST OF NEW ENGLAND. THE NAO DID TREND TOWARDS NEUTRAL AT
TIMES, WHICH ALLOWED THE TROUGH AXIS TO SHIFT NEAR OVERHEAD OF THE
CONCORD AREA AND SOMETIMES EAST OF NEW ENGLAND. THIS EASTWARD SHIFT
OF THE TROUGH AXIS ALLOWED FOR COOL AND DRY HIGH PRESSURE SYSTEMS TO
BUILD INTO THE AREA BRINGING PERIODS OF DRY WEATHER WITH
TEMPERATURES TRENDING NEAR NORMAL.

THE AVERAGE TEMPERATURE FOR SUMMER WAS 68.6, WHICH WAS 0.2 DEGREES
BELOW NORMAL. THE COOLEST SUMMER ON RECORD WAS IN 1903 WHEN THE
AVERAGE TEMPERATURE WAS 62.6 DEGREES. THE WARMEST WAS 72.3 DEGREES
IN 1872.

A TOTAL OF 15.52 INCHES OF PRECIPITATION FELL, WHICH WAS 4.50 INCHES
ABOVE NORMAL. THE HEAVIEST PRECIPITATION FELL ON JULY 16TH WHEN 1.56
INCHES WAS MEASURED. THE WETTEST SUMMER ON RECORD WAS IN 1897 WHEN
20.49 INCHES OF PRECIPITATION FELL. THE DRIEST WAS 3.65 INCHES IN
1913.

THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN SUMMER 2023...
DATE    RECORD                               PREVIOUS
JUL  7    70   - WARMEST LOW TEMPERATURE     70 IN 1993 AND OTHERS

$$

DS