Climatological Report (Seasonal)
Issued by NWS Portland, ME
Issued by NWS Portland, ME
000 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