Climatological Report (Monthly)
Issued by NWS Portland, ME
Issued by NWS Portland, ME
000 CXUS51 KGYX 021635 CLMCON PWMCLMCON 000 TTAA00 GYX 011821 CLIMATE REPORT NATIONAL WEATHER SERVICE GRAY ME 221 PM EDT SUN OCT 01 2023 ................................... ...THE CONCORD NH CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 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 09/02/1953 LOW 20 09/30/1941 HIGHEST 93 09/07 88 5 88 09/04 LOWEST 37 09/27 32 5 32 09/30 AVG. MAXIMUM 75.4 73.7 1.7 71.9 AVG. MINIMUM 53.5 49.0 4.5 49.3 MEAN 64.4 61.4 3.0 60.6 DAYS MAX >= 90 3 0.9 2.1 0 DAYS MAX <= 32 0 0.0 0.0 0 DAYS MIN <= 32 0 1.2 -1.2 1 DAYS MIN <= 0 0 0.0 0.0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 10.97 1888 MINIMUM 0.21 1914 TOTALS 4.28 3.63 0.65 4.16 DAILY AVG. 0.14 0.12 0.02 0.14 DAYS >= .01 10 9.3 0.7 9 DAYS >= .10 6 5.9 0.1 6 DAYS >= .50 3 2.2 0.8 4 DAYS >= 1.00 1 0.9 0.1 2 GREATEST 24 HR. TOTAL 1.65 09/18 TO 09/19 SNOWFALL (INCHES) RECORDS TOTAL T 1992 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 113 160 -47 153 SINCE 7/1 131 191 -60 155 COOLING TOTAL 102 50 52 29 SINCE 1/1 570 525 45 646 ................................................................ WIND (MPH) AVERAGE WIND SPEED 3.4 HIGHEST WIND SPEED/DIRECTION 29/310 DATE 09/16 HIGHEST GUST SPEED/DIRECTION 43/300 DATE 09/16 SKY COVER AVERAGE SKY COVER 0.38 AVERAGE RH (PERCENT) 77 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 2 HEAVY RAIN 4 RAIN 7 LIGHT RAIN 12 FREEZING RAIN 0 LT FREEZING RAIN 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 FOG 21 FOG W/VIS <= 1/4 MILE 9 HAZE 1 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && AFTER A WET SUMMER IN THE CONCORD AREA, A BROAD AREA OF HIGH PRESSURE BUILT INTO THE NORTHEAST DURING THE FIRST WEEK OF SEPTEMBER. THIS HIGH PRESSURE BROUGHT THE DRIEST STRETCH OF WEATHER THE CONCORD AREA HAD SEEN SINCE THE END OF MAY. ALONG WITH DRY WEATHER, TEMPERATURES CLIMBED WELL ABOVE NORMAL DURING THE FIRST WEEK OF SEPTEMBER WITH THREE DAYS IN A ROW OF HIGHS IN THE 90S FROM THE 5TH INTO THE 7TH. IT WAS ALSO DURING THIS TIME THAT TROPICAL ACTIVITY WAS INCREASING IN THE ATLANTIC BASIN. SOME FRONTAL SYSTEMS BROUGHT A RETURN TO WET WEATHER DURING THE SECOND WEEK OF SEPTEMBER BEFORE ATTENTION TURNED TO HURRICANE LEE THAT WAS TRACKING NORTHWARD THROUGH THE WESTERN ATLANTIC. LEE MOVED INTO THE EASTERN GULF OF MAINE ON THE 15TH AS A CATEGORY 1 HURRICANE AND TRANSITIONED TO A POST TROPICAL SYSTEM ON THE 16TH AS IT TRACKED NORTHEASTWARD THROUGH THE BAY OF FUNDY. THIS SYSTEM BROUGHT HIGH SURF AND RIP CURRENTS TO AREA BEACHES ALONG WITH A PEAK WIND GUST TO 43 MPH ON THE 16TH WHILE THE BULK OF RAIN MISSED THE CONCORD AREA TO THE EAST. A MORE SIGNIFICANT RAIN EVENT OCCURRED ON THE 18TH INTO THE 19TH WHEN LOW PRESSURE TRACKED ACROSS CAPE COD INTO THE GULF OF MAINE BRINGING 1.64 INCHES OF RAIN. HIGH PRESSURE BUILT INTO THE NORTHEAST DURING THE THIRD WEEK OF SEPTEMBER AND DOMINATED THE WEATHER PATTERN THROUGH THE END OF THE MONTH. THE AVERAGE TEMPERATURE FOR THE MONTH WAS 64.4 DEGREES, WHICH WAS 3.0 DEGREES ABOVE NORMAL AND TIED FOR THE 7TH WARMEST SEPTEMBER ON RECORD. THE WARMEST SEPTEMBER WAS IN 1961 WHEN THE AVERAGE TEMPERATURE WAS 67.1 DEGREES. THE COOLEST WAS 53.6 DEGREES IN 1893. THE FOLLOWING TABLE LISTS THE WARMEST SEPTEMBERS ON RECORD AT CONCORD. WARMEST AVERAGE TEMPERATURE IN SEPTEMBER (SINCE 1868)... RANK TEMP YEAR 1 67.1 1961 2 65.5 1881 3 65.4 2017 4 65.2 2015 5 64.6 2018 64.6 1877 7 64.4 2023 <=== 64.4 2016 9 64.3 1872 10 63.9 2011 A TOTAL OF 4.28 INCHES OF PRECIPITATION FELL, WHICH WAS 0.65 INCHES ABOVE NORMAL. THE HEAVIEST PRECIPITATION OCCURRED ON THE 18TH INTO THE 19TH WHEN 1.65 INCHES OF RAIN FELL. THE WETTEST SEPTEMBER ON RECORD WAS IN 1888 WHEN 10.97 INCHES OF PRECIPITATION FELL. THE DRIEST WAS 0.21 INCHES IN 1914. THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN SEPTEMBER 2023... DATE RECORD PREVIOUS SEP 5 92 - WARMEST HIGH TEMPERATURE 91 IN 2018 AND OTHERS SEP 6 92 - WARMEST HIGH TEMPERATURE 92 IN 2018 (TIED) $$ DS/SB