Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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000 CXUS51 KBUF 052203 CLMROC CLIMATE REPORT NATIONAL WEATHER SERVICE BUFFALO NY 435 PM EDT THU OCT 1 2020 ................................... ...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2020... CLIMATE NORMAL PERIOD 1981 TO 2010 CLIMATE RECORD PERIOD 1871 TO 2020 WEATHER OBSERVED NORMAL DEPART LAST YEAR`S VALUE DATE(S) VALUE FROM VALUE DATE(S) NORMAL ................................................................ TEMPERATURE (F) RECORD HIGH 99 09/03/1953 LOW 28 09/28/1947 HIGHEST 85 09/27 88 09/22 LOWEST 35 09/21 48 09/27 09/19 09/17 AVG. MAXIMUM 72.6 71.6 1.0 74.7 AVG. MINIMUM 51.7 52.0 -0.3 54.4 MEAN 62.2 61.8 0.4 64.6 DAYS MAX >= 90 0 0.3 -0.3 0 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 6.30 1977 MINIMUM 0.28 1960 TOTALS 2.29 3.38 -1.09 3.01 DAYS >= .01 9 12 DAYS >= .10 4 8 DAYS >= .50 2 3 DAYS >= 1.00 0 0 GREATEST 24 HR. TOTAL 0.85 09/30 TO 09/30 SNOWFALL (INCHES) RECORDS TOTAL T 1956 TOTALS 0.0 0.0 0.0 0.0 SINCE 7/1 0.0 0.0 0.0 0.0 SNOWDEPTH AVG. 0 MM MM 0 DAYS >= 1.0 0 0.0 0.0 0 GREATEST SNOW DEPTH 0 0 24 HR TOTAL 0.0 09/30 TO 09/30 DEGREE_DAYS HEATING TOTAL 135 147 -12 59 SINCE 7/1 142 181 -39 64 COOLING TOTAL 57 50 7 51 SINCE 1/1 795 534 261 608 ................................................................. WIND (MPH) AVERAGE WIND SPEED 7.6 HIGHEST WIND SPEED/DIRECTION 38/210 HIGHEST GUST SPEED/DIRECTION 60/210 DATE 09/07 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.60 NUMBER OF DAYS FAIR 5 NUMBER OF DAYS PC 15 NUMBER OF DAYS CLOUDY 10 AVERAGE RH (PERCENT) 70 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 1 MIXED PRECIP 0 HEAVY RAIN 1 RAIN 6 LIGHT RAIN 8 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 SLEET 0 FOG 12 FOG W/VIS <= 1/4 MILE 1 HAZE 0 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && ...PLEASANT SEPTEMBER... WARM AND DRY CONDITIONS THAT ENDED THE SUMMER OF 2020 CARRIED OVER INTO SEPTEMBER WITH ABOVE NORMAL TEMPERATURES TREATING WESTERN NEW YORK TO CONTINUED SUMMER-LIKE WEATHER. THERE WERE SEVERAL INTRUSIONS OF COOLER AIRMASSES THAT KEPT THE SEPTEMBER AVERAGE TEMPERATURE IN CHECK, WITH THE LAST COOL AIRMASS OF THE MONTH BRINGING WELCOMED RAINFALL IN THE FORM OF LAKE EFFECT RAIN SHOWERS. THE TEMPERATURE AVERAGED JUST ABOVE NORMAL FOR THE MONTH, FINISHING AT 62.2F. THERE WERE 8 DAYS THAT REACHED 80F, ONE MORE THAN NORMAL. A SURGE OF CANADIAN AIR TOWARDS THE END OF THE THIRD WEEK BROUGHT EARLY FROST AND FREEZE ACROSS INLAND AREAS. THE COOLEST TEMPERATURE THIS MONTH OCCURRED ON THE MORNING OF THE 21ST WITH A MORNING LOW OF 35F. THIS TIED THE YEAR 1973 FOR COOLEST TEMPERATURE FOR THE 21ST. TWO DAYS EARLIER, THERE WAS ANOTHER RECORD LOW TEMPERATURE TIED, THIS BEING 36F ON THE 19TH, LAST SET IN 1993. IN ALL THERE WERE 4 DAYS WITH A TEMPERATURE IN THE 30S, RANKING TIED FOR 6TH PLACE FOR GREATEST NUMBER OF SEPTEMBER DAYS THAT DIPPED INTO THE 30S. PRECIPITATION TOTALED 2.29 INCHES FOR THE MONTH, WHICH IS JUST OVER AN INCH BELOW NORMAL. THIS TOTAL IS A BIT DECEIVING AS NEARLY THREE- QUARTERS OF THIS TOTAL FELL ON THE LAST 2 DAYS OF THE MONTH, AND AS A WHOLE, DRYNESS GRIPPED SEPTEMBER. ONLY THREE-HUNDREDTHS OF AN INCH OF PRECIPITATION FELL AT THE ROCHESTER AIRPORT OVER A 15 DAY STRETCH FROM THE 14TH TO THE 28TH. THE SEVERAL INCHES OF RAIN THAT FELL WITHIN LAKE EFFECT RAIN SHOWERS EAST OF LAKE ERIE THE LAST DAYS OF SEPTEMBER DID NOT CAUSE ANY FLOODING PROBLEMS DUE TO ANTECEDENT DRY CONDITIONS. A SLOW MOVING FRONTAL BOUNDARY SERVED SHOWERS AND A FEW THUNDERSTORMS THE FIRST FEW DAYS OF SEPTEMBER ACROSS WESTERN NEW YORK. OUTSIDE OF THESE STORMS, CONTINUED SUMMER-LIKE CONDITIONS WERE FOUND ACROSS THE REGION. COLD FRONTS BEGAN TO CHIP AWAY AT THIS SUMMER AIRMASS, WITH THE FIRST COLD FRONT OF THE MONTH CROSSING THE REGION DURING THE EARLY MORNING HOURS OF THE 4TH. ANOTHER COLD FRONT CROSSED WESTERN NEW YORK DURING THE MORNING HOURS OF LABOR DAY THE 7TH. BRIEF, BUT VERY STRONG WINDS BEHIND THIS FRONT DOWNED SEVERAL TREES ACROSS INTERIOR WESTERN NEW YORK. MORNING RAIN ON THE 13TH OF THE MONTH BROUGHT A HALF INCH OF RAINFALL BETWEEN BUFFALO AND ROCHESTER, AND WOULD END UP BEING THE LAST MEANINGFUL RAINFALL FOR THE MONTH UNTIL THE FINAL DAYS OF SEPTEMBER. A PROLONGED SUNNY AND DRY STRETCH BETWEEN THE 14TH AND 28TH GAVE AMPLE OPPORTUNITIES FOR OUTDOOR ACTIVITIES. WHILE AFTERNOONS WERE COMFORTABLE, SEVERAL MORNINGS STARTED CHILLY, INCLUDING THE WEEKEND OF THE 19TH THROUGH 21ST, WHEN RECORD LOWS AND AN EARLY FROST GREETED INTERIOR LOCATIONS OF WESTERN NEW YORK. A BROAD UPPER LEVEL TROUGH OF COLD AIR SURGED ACROSS THE GREAT LAKES THE FINAL TWO DAYS OF SEPTEMBER, BRINGING NUMEROUS BANDS OF LAKE EFFECT RAIN SHOWERS, LOCALIZED THUNDER AND SOME GRAUPEL TO THE EASTERN GREAT LAKES REGION. IT WAS A BREEZY MONTH, WITH WINDS AVERAGING JUST ABOVE NORMAL AT 7.6 MPH. THE STRONGEST WIND GUST OCCURRED ON THE 7TH, WHEN BEHIND A COLD FRONT STRONGER WINDS ALOFT MIXED DOWN A 60 MPH WIND GUST DURING THE MORNING HOURS. IN ALL A PLEASANT MONTH, WITH AMPLE OUTDOOR ACTIVITY TIME. && THOMAS $$

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