Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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000 CXUS51 KBUF 052200 CLMROC CLIMATE REPORT NATIONAL WEATHER SERVICE BUFFALO NY 1253 PM EDT SUN OCT 1 2017 ................................... ...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2017... CLIMATE NORMAL PERIOD 1981 TO 2010 CLIMATE RECORD PERIOD 1871 TO 2017 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 91 09/27 92 09/07 09/26 09/25 LOWEST 41 09/30 42 09/25 AVG. MAXIMUM 76.5 71.6 4.9 77.8 AVG. MINIMUM 54.7 52.0 2.7 55.8 MEAN 65.6 61.8 3.8 66.8 DAYS MAX >= 90 4 0.3 3.7 3 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 1.28 3.38 -2.10 2.30 DAYS >= .01 9 8 DAYS >= .10 4 4 DAYS >= .50 0 2 DAYS >= 1.00 0 1 GREATEST 24 HR. TOTAL 0.35 09/03 TO 09/03 09/17 TO 09/18 09/30 TO 09/30 09/30 TO 09/30 SNOWFALL (INCHES) RECORDS TOTAL MM MM 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 MM 0 MM 24 HR TOTAL 0.0 09/30 TO 09/30 09/30 TO 09/30 09/30 TO 09/30 09/30 TO 09/30 DEGREE_DAYS HEATING TOTAL 92 147 -55 51 SINCE 7/1 119 181 -62 51 COOLING TOTAL 117 50 67 112 SINCE 1/1 633 534 99 963 ................................................. WIND (MPH) AVERAGE WIND SPEED 5.9 HIGHEST WIND SPEED/DIRECTION 28/250 HIGHEST GUST SPEED/DIRECTION 35/250 DATE 09/04 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.50 NUMBER OF DAYS FAIR 6 NUMBER OF DAYS PC 19 NUMBER OF DAYS CLOUDY 5 AVERAGE RH (PERCENT) 73 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 3 MIXED PRECIP 0 HEAVY RAIN 2 RAIN 6 LIGHT RAIN 10 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 SLEET 0 FOG 20 FOG W/VIS <= 1/4 MILE 4 HAZE 1 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && ...TWO HALVES OF SEPTEMBER... SEPTEMBER FEATURED A COOL AND WET START TO THE MONTH, FOLLOWED BY A DRY AND EVENTUALLY HOT FINISH. A HEAT WAVE THE LAST WEEK OF THE MONTH FEATURED THE LATEST CONSECUTIVE FOUR DAYS REACHING INTO THE 90S. THE TEMPERATURE FOR THE MONTH AVERAGED 65.6F WHICH IS 3.8 DEGREES ABOVE NORMAL. HOWEVER THE MONTH CAN BE BROKEN DOWN INTO TWO DISTINCT WEATHER REGIMES...A COOL FIRST 11 DAYS, AND A VERY WARM REMAINING 19 DAYS OF THE MONTH. THE FIRST 11 DAYS AVERAGED 59.9F, WHILE THE LAST 19 DAYS AVERAGED ABOUT 10 DEGREES WARMER AT 69.3F. THERE WERE 3 RECORD HIGHS ESTABLISHED, 91F/24TH, 91F/26TH AND 91F/27TH. THE FOUR DAYS REACHING 91F (24TH - 27TH) WERE THE LATEST FOUR CONSECUTIVE DAYS REACHING INTO THE 90S AT ROCHESTER. THIS SEPTEMBER PAIRS WITH FEBRUARY AS HAVING THREE RECORD HIGH TEMPERATURES IN A MONTH, GREATEST THIS YEAR. THE 15 DAYS OF 80F OR GREATER TEMPERATURES IS TIED FOR THIRD GREATEST FOR THE MONTH OF SEPTEMBER, AND THE 4 DAYS REACHING 90F IS THE GREATEST AMOUNT IN SEPTEMBER SINCE 2002, WHEN THERE WERE 5 DAYS. PRECIPITATION TOTALED 1.28 INCHES THIS MONTH, WHICH IS WELL BELOW NORMAL OF 3.38 INCHES. THIS SEPTEMBER JOINS ONLY AUGUST FOR THE YEAR WITH BELOW NORMAL PRECIPITATION. THE BULK OF THIS PRECIPITATION OCCURRED THE FIRST WEEK, INCLUDING THIS MONTHS GREATEST DAILY RAINFALL TOTAL OF 0.35 INCHES ON THE 3RD IN REMNANTS FROM HURRICANE HARVEY. THE STRETCH OF 20 CONSECUTIVE DAYS WITHOUT MEASURABLE RAINFALL (9TH TO 28TH) WAS TIED FOR THE 5TH LONGEST, AND WAS LONGEST STRETCH OF NON MEASURABLE PRECIPITATION SINCE MAY OF 1977. HIGH PRESSURE STARTED THE MONTH WITH FAIR WEATHER ACROSS WESTERN NEW YORK. THE REMNANTS OF HURRICANE HARVEY PASSED BY THE REGION ON THE 2ND AND 3RD WITH MINOR RAINFALL AMOUNTS. FOLLOWING ONE MILD AFTERNOON ON THE 4TH, A LINE OF THUNDERSTORMS CROSSED THE REGION THAT EVENING, WITH STRONG WINDS FELLING TREES ACROSS THE SOUTHERN TIER AND TOWARDS THE FINGER LAKES REGION. COOLER AIR THEN SETTLED INTO WESTERN NEW YORK FROM THE 5TH THROUGH THE 11TH. A DISTINCT PATTERN CHANGE THEN OCCURRED MID-MONTH, WITH TEMPERATURES SOARING TO 79F ON THE 12TH. RAIN FROM HURRICANE IRMA REMAINED JUST SOUTH AND EAST OF THE REGION ON THE 12TH AND 13TH, ALLOWING FOR A PROLONGED STRETCH OF DRY WEATHER. THE DRY GROUND, COUPLED WITH HEAT BROUGHT NORTHWARD FROM TROPICAL ACTIVITY BUILT A STRONG HIGH PRESSURE OVER THE EASTERN US, SUCH THAT AIR TEMPERATURES REACHED 91F ON FOUR CONSECUTIVE DAYS FROM THE 24TH TO 27TH. THIS HEAT AND DRY WEATHER DELAYED THE TURNING OF FALL FOLIAGE WITH MANY TREES STILL GREEN TO FINISH THE MONTH. THE FINAL TWO DAYS OF THE MONTH ENDED BELOW NORMAL WITH RAIN BOTH DAYS. STRONGEST WINDS THIS MONTH WERE 35 MPH ON AFTERNOON OF THE 4TH. AVERAGE WIND SPEEDS WERE 1.5 MPH BELOW NORMAL, FINISHING AT 5.9 MPH. IN ALL, A COOL START TO THE MONTH GIVING WAY TO LATE SUMMER`S HEAT. && THOMAS $$

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