Climatological Report (Monthly)
Issued by NWS Portland, ME

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000 CXUS51 KGYX 041631 CLMCON PWMCLMCON 000 TTAA00 KGYX 021927 CLIMATE REPORT NATIONAL WEATHER SERVICE GRAY ME 1231 PM EDT WED OCT 4 2017 ................................... ...THE CONCORD NH CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2017... CLIMATE NORMAL PERIOD 1981 TO 2010 CLIMATE RECORD PERIOD 1868 TO 2017 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 91 09/24 88 3 94 09/09 LOWEST 35 09/02 32 3 32 09/26 AVG. MAXIMUM 77.2 72.6 4.6 78.0 AVG. MINIMUM 53.6 47.4 6.2 50.8 MEAN 65.4 60.0 5.4 64.4 DAYS MAX >= 90 4 0.6 3.4 1 DAYS MAX <= 32 0 0.0 0.0 0 DAYS MIN <= 32 0 1.5 -1.5 1 DAYS MIN <= 0 0 0.0 0.0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 10.97 1888 MINIMUM 0.21 1914 TOTALS 3.06 3.38 -0.32 2.94 DAILY AVG. 0.10 0.11 -0.01 0.10 DAYS >= .01 7 9.3 -2.3 9 DAYS >= .10 4 6.1 -2.1 4 DAYS >= .50 2 2.2 -0.2 1 DAYS >= 1.00 2 0.8 1.2 1 GREATEST 24 HR. TOTAL 1.26 09/03 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 88 187 -99 102 SINCE 7/1 141 235 -94 114 COOLING TOTAL 105 37 68 91 SINCE 1/1 550 450 100 715 ................................................................. WIND (MPH) AVERAGE WIND SPEED 4.6 HIGHEST WIND SPEED/DIRECTION 24/320 DATE 09/28 HIGHEST GUST SPEED/DIRECTION 35/300 DATE 09/01 SKY COVER AVERAGE SKY COVER 0.40 AVERAGE RH (PERCENT) 72 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 1 HEAVY RAIN 4 RAIN 4 LIGHT RAIN 8 FREEZING RAIN 0 LT FREEZING RAIN 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 FOG 19 FOG W/VIS <= 1/4 MILE 6 HAZE 1 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && SEPTEMBER BEGAN THE SAME WAY AUGUST ENDED, WITH COOL, FALL-LIKE WEATHER. THE TEMPERATURE FELL ALL THE WAY TO 35 DEGREES ON SEPTEMBER 2! THE NEXT FEW DAYS BROUGHT A FEW ROUNDS OF RAINFALL INCLUDING MORE THAN AN INCH OF RAIN ON THE 3RD AND THE 6TH. BY THE MIDDLE OF THE MONTH A WARM AND HUMID WEATHER PATTERN HAD BEGUN, WITH A RIDGE OF HIGH PRESSURE OVER THE WESTERN ATLANTIC AND EAST COAST PUMPING WARM, HUMID AIR INTO NEW ENGLAND. THE TEMPERATURE TOPPED 80 DEGREES FOR 7 CONSECUTIVE DAYS FROM THE 11TH THROUGH THE 17TH. ALTHOUGH OCCASIONAL COLD FRONTS KNOCKED TEMPERATURES BACK A FEW DEGREES, THE WARMTH AND HUMIDITY KEPT RETURNING. THE HOTTEST STRETCH WAS FROM THE 24TH THROUGH THE 27TH WHEN THE TEMPERATURE HIT 90 DEGREES FOR 4 CONSECUTIVE DAYS. THIS WAS THE LONGEST STRETCH OF 90 DEGREE WEATHER TO BE OBSERVED SO LATE IN THE SEASON AT CONCORD. A STRONG COLD FRONT BROUGHT COOLER WEATHER FOR THE LAST TWO DAYS OF THE MONTH, MORE TYPICAL OF WHAT WOULD BE EXPECTED IN FALL. THE AVERAGE TEMPERATURE FOR THE MONTH WAS 65.4 DEGREES WHICH WAS 5.4 DEGREES ABOVE NORMAL AND THE 3RD WARMEST SEPTEMBER ON RECORD. THE WARMEST SEPTEMBER WAS IN 1961 WHEN THE AVERAGE TEMPERATURE WAS 67.1 DEGREES. THE COOLEST WAS IN 1893 WHEN THE AVERAGE WAS ONLY 53.6 DEGREES. 4 OF THE LAST 7 SEPTEMBERS AT CONCORD HAVE FINISHED IN THE TOP 10 WARMEST ON RECORD. THE FOLLOWING TABLE LISTS THE WARMEST SEPTEMBERS ON RECORD. 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 1877 6 64.4 2016 7 64.3 1872 8 63.9 2011 9 63.7 1880 10 63.6 1891 THE HEAT WAVE FROM SEPTEMBER 24 THROUGH 27 FEATURED 4 CONSECUTIVE DAYS OF 90 DEGREE HEAT. THIS WAS THE LATEST IN THE SEASON THAT CONCORD HAS EVER OBSERVED 3 OR MORE CONSECUTIVE DAYS OF 90 DEGREE HEAT. IT ALSO TIES AS THE LONGEST CONSECUTIVE STRETCH OF 90 DEGREE HEAT TO OCCUR IN SEPTEMBER. THE FOLLOWING TABLE LISTS THE ONLY TIMES IN CONCORD`S HISTORY THAT 3 OR MORE CONSECUTIVE DAYS OF 90 DEGREE HEAT HAVE BEEN OBSERVED IN SEPTEMBER. MOST CONSECUTIVE DAYS OF 90 DEGREE HEAT (SINCE 1868)... RANK DAYS DATES 1 4 SEP 24 THRU SEP 27, 2017 <=== 2 4 AUG 31 THRU SEP 3, 1937 3 4 SEP 3 THRU 6, 1880 4 3 SEP 8 THRU 10, 2002 5 3 SEP 2 THRU 4, 1973 6 3 SEP 10 THRU 12, 1961 7 3 SEP 21 THRU 23, 1895 A TOTAL OF 3.06 INCHES OF RAIN FELL WHICH WAS 0.32 INCHES BELOW NORMAL. NEARLY ALL OF THIS RAIN FELL IN THE FIRST WEEK OF THE MONTH, WITH THE HEAVIEST FALLING ON THE 3RD WHEN 1.26 INCHES WAS RECORDED. THE DRIEST SEPTEMBER WAS IN 1914 WHEN ONLY 0.21 INCHES FELL. THE WETTEST WAS IN 1888 WHEN 10.97 INCHES WAS MEASURED. THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN SEPTEMBER 2017... DATE RECORD PREVIOUS 24 91 - WARMEST HIGH TEMPERATURE 90 IN 2010 25 90 - WARMEST HIGH TEMPERATURE 89 IN 1970 26 90 - WARMEST HIGH TEMPERATURE 90 IN 2007 /TIED/ 27 90 - WARMEST HIGH TEMPERATURE 88 IN 1933 $$ KIMBLE

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