Climatological Report (Seasonal)
Issued by NWS
Issued by NWS
000
CXUS51 KGYX 040828
CLSMHT
PWMCLSMHT 000
TTAA00 GYX 011114
CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAY ME
430 AM EDT MON SEP 04 2023
...................................
...THE MANCHESTER CLIMATE SUMMARY FOR THE SUMMER SEASON, FROM
6/1/2023 TO 8/31/2023...
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1885 TO 2023
WEATHER OBSERVED NORMAL DEPART LAST YEAR`S
VALUE DATE(S) VALUE FROM VALUE DATE(S)
NORMAL
................................................................
TEMPERATURE (F)
HIGHEST 95 06/02 97 -2 99 08/04
08/08
LOWEST 47 06/04 44 3 48 06/20
06/08
06/11
AVG. MAXIMUM 80.7 81.7 -1.0 84.9
AVG. MINIMUM 61.0 61.1 -0.1 62.9
MEAN 70.9 71.4 -0.5 73.9
DAYS MAX >= 90 9 13.8 -4.8 28
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)
TOTALS 18.58 10.69 7.89 6.39
DAILY AVG. 0.21 0.12 0.09 0.07
DAYS >= .01 36 34.2 1.8 29
DAYS >= .10 31 20.8 10.2 17
DAYS >= .50 9 7.0 2.0 3
DAYS >= 1.00 4 2.4 1.6 1
GREATEST
24 HR. TOTAL 2.50 07/16
SNOWFALL (INCHES)
TOTALS 0.0 0.0
SINCE 7/1 0.0 0.0
DAYS >= TRACE 0 0
DAYS >= 1.0 0 0
GREATEST
SNOW DEPTH 0 0
DEGREE DAYS
HEATING TOTAL 64 57 7 27
SINCE 7/1 1 5 -4 0
COOLING TOTAL 631 650 -19 874
SINCE 1/1 660 689 -29 950
................................................................
WIND (MPH)
AVERAGE WIND SPEED 5.3
HIGHEST WIND SPEED/DIRECTION 28/310 DATE 08/09
HIGHEST GUST SPEED/DIRECTION 38/310 DATE 08/09
SKY COVER
AVERAGE SKY COVER 0.67
AVERAGE RH (PERCENT) 71
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 23 HEAVY RAIN 23
RAIN 27 LIGHT RAIN 50
FREEZING RAIN 0 LT FREEZING RAIN 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 FOG 57
FOG W/VIS <= 1/4 MILE 5 HAZE 22
- 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
MANCHESTER 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. THE
MANCHESTER AREA DID SEE SOME HEAVY RAIN AND FLASH FLOODING EVENTS.
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 18 DAYS OF THE
MONTH RECORDING MEASURABLE RAINFALL 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 MANCHESTER AREA
OFTEN STAYED ON THE WARM AND HUMID SIDE OF THESE FRONTS RESULTING IN
23 DAYS 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
MANCHESTER 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 OVERHEAD OF THE MANCHESTER 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 THE SUMMER SEASON WAS 70.9 DEGREES,
WHICH WAS 0.5 DEGREES BELOW NORMAL. THE COOLEST SUMMER ON RECORD WAS
IN 1946 WHEN THE AVERAGE TEMPERATURE WAS 64.9 DEGREES. THE WARMEST
WAS 74.4 DEGREES IN 2020.
A TOTAL OF 18.58 INCHES OF PRECIPITATION FELL, WHICH WAS 7.89 INCHES
ABOVE NORMAL. ON AUGUST 18TH THERE WAS A TIPPING BUCKET ERROR
AND PRECIPITATION FOR THE DAY IS MARKED AS MISSING. NEARBY
OBSERVATIONS IN THE AREA SHOWED AROUND 0.50 INCHES OF RAIN FELL THAT
DAY. THE HEAVIEST PRECIPITATION FELL ON JULY 16TH WHEN 2.50
INCHES WAS MEASURED. THE WETTEST SUMMER ON RECORD WAS IN 1938 WHEN
20.32 INCHES OF PRECIPITATION FELL. THE DRIEST WAS 5.21 INCHES IN
2016.
HISTORICAL RECORDS AT MANCHESTER BEGAN IN 1885 BUT WITHIN THIS
RECORD THERE REMAINS NUMEROUS YEARS OF UNAVAILABLE DATA. DUE TO
THIS, HISTORICAL RECORDS SHOULD BE CONSIDERED INCOMPLETE AS SOME
SIGNIFICANT EXTREMES MAY BE MISSING FROM THE DATA. MORE CONSISTENT
MODERN RECORDS BEGAN IN 1998 AND CONTINUE TO THE PRESENT.
$$
DS/SB