798  
CXUS51 KBUF 041418  
CLMROC  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BUFFALO NY  
739 AM EDT MON OCT 1 2018  
   
...............................
 
 
 
...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2018...  
 
CLIMATE NORMAL PERIOD 1981 TO 2010  
CLIMATE RECORD PERIOD 1871 TO 2018  
 
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 94 09/05 91 09/27  
09/26  
09/25  
LOWEST 42 09/23 41 09/30  
AVG. MAXIMUM 76.5 71.6 4.9 76.5  
AVG. MINIMUM 58.9 52.0 6.9 54.7  
MEAN 67.7 61.8 5.9 65.6  
DAYS MAX >= 90 3 0.3 2.7 4  
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 2.81 3.38 -0.57 1.28  
DAYS >= .01 10 9  
DAYS >= .10 4 4  
DAYS >= .50 3 0  
DAYS >= 1.00 1 0  
GREATEST  
24 HR. TOTAL 1.19 09/10 TO 09/10  
 
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 MM  
 
DEGREE_DAYS  
HEATING TOTAL 80 147 -67 92  
SINCE 7/1 80 181 -101 119  
COOLING TOTAL 168 50 118 117  
SINCE 1/1 968 534 434 633    
.............................................................
 
 
WIND (MPH)  
AVERAGE WIND SPEED 7.2  
HIGHEST WIND SPEED/DIRECTION 31/230  
HIGHEST GUST SPEED/DIRECTION 40/250 DATE 09/21  
 
SKY COVER  
POSSIBLE SUNSHINE (PERCENT) MM  
AVERAGE SKY COVER 0.60  
NUMBER OF DAYS FAIR 2  
NUMBER OF DAYS PC 14  
NUMBER OF DAYS CLOUDY 14  
 
AVERAGE RH (PERCENT) 77  
 
WEATHER CONDITIONS. NUMBER OF DAYS WITH  
THUNDERSTORM 2 MIXED PRECIP 0  
HEAVY RAIN 4 RAIN 3  
LIGHT RAIN 14 FREEZING RAIN 0  
LT FREEZING RAIN 0 HAIL 0  
HEAVY SNOW 0 SNOW 0  
LIGHT SNOW 0 SLEET 0  
FOG 13 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.  
 

 
   
..WARM SEPTEMBER CLOSES OUT A VERY WARM SUMMER SEASON
 
 
A 5TH STRAIGHT ABOVE NORMAL TEMPERATURE MONTH CLOSES OUT THE WARMEST  
5-MONTH STRETCH IN RECORDED HISTORY AT BUFFALO. ALONE, SEPTEMBER WAS  
TIED FOR THE 6TH WARMEST MONTH WHILE PRECIPITATION TOTALED JUST  
BELOW NORMAL. ASIDE FROM TWO WET PERIODS WITH OVER AN INCH OF  
RAINFALL, MUCH OF THE RAIN THIS MONTH WAS LIGHT.  
 
THE TEMPERATURE AVERAGED 67.7F THIS MONTH WHICH IS TIED WITH THE  
YEAR 2002 FOR 6TH WARMEST. THERE WERE 22 DAYS THAT FINISHED ABOVE  
NORMAL AND TWO RECORD TEMPERATURES WERE ESTABLISHED. THE 73F DEGREE  
MINIMUM ON THE 2ND TIED WITH 1898 FOR WARMEST MINIMUM TEMPERATURE.  
THE 92 DEGREE READING ON THE 21ST WAS BOTH THE 22ND 90 PLUS DEGREE  
DAY FOR THE YEAR, BUT ALSO A RECORD FOR THE DATE, BREAKING THE OLD  
RECORD OF 91 SET BACK IN 1931. THE NIGHTS AGAIN FINISHED WELL ABOVE  
NORMAL AVERAGING 58.9F WHICH IS 6.9 DEGREES ABOVE NORMAL, AND  
WARMEST AVERAGE MINIMUM TEMPERATURES FOR SEPTEMBER SINCE 1921. THE  
TEMPERATURE ON THE 22ND DIPPED TO 48F NEAR MIDNIGHT AND WAS THE  
FIRST SUB 50F DEGREE READING SINCE JUNE 26TH, A RUN LENGTH OF 87  
STRAIGHT DAYS.  
 
PRECIPITATION FOR THE MONTH TOTALED 2.81 INCHES WHICH IS ABOUT A  
HALF AN INCH BELOW NORMAL. THE 10 DAYS WITH MEASURABLE RAIN WAS ONE  
DAY LESS THAN NORMAL. THERE WERE TWO PERIODS THAT HAD OVER AN INCH  
OF RAINFALL, THE 10TH WITH A NEW DAILY RECORD OF 1.19 INCHES AND THE  
25TH-26TH WITH 1.23 INCHES. THE LONGEST STRETCH WITHOUT ANY TRACE OF  
RAIN THIS MONTH CAME FROM THE 12TH THROUGH THE 19TH.  
 
LABOR DAY WEEKEND STARTED SEPTEMBER AND IT WAS A HOT AND HUMID  
WEEKEND WITH TEMPERATURES FROM THE HOLIDAY WEEKEND THROUGH THE 5TH  
IN THE UPPER 80S TO LOWER 90S. THERE WERE A FEW SCATTERED SHOWERS  
AND THUNDERSTORMS TO BRING SOME RELIEF FROM THE EARLY WARMTH. ON THE  
3RD SEVERAL THUNDERSTORMS WITH AN IMPRESSIVE AMOUNT OF LIGHTNING  
FORMED ALONG THE SOUTHERN LAKE ONTARIO SHORELINE PRODUCING SOME TREE  
DAMAGE ACROSS NIAGARA COUNTY BEFORE WEAKENING FARTHER DOWN THE  
SHORELINE. THE HOT STRETCH PEAKED ON THE 5TH WHEN THE AFTERNOON  
TEMPERATURE REACHED 94F. A COLD FRONT CROSSED THE REGION LATE ON THE  
5TH BRINGING RELIEF FROM THE HEAT.  
 
THE FIRST OF TWO WIDESPREAD SOAKING RAIN EVENTS THIS MONTH CAME ON  
MONDAY THE 10TH. SUBTROPICAL MOISTURE LIFTED ACROSS WESTERN NEW  
YORK, ALONG WITH THE REMNANT CIRCULATION OF GORDON. THIS BROUGHT ONE  
TO TWO INCHES OF RAIN ACROSS WESTERN NEW YORK. IT WAS THEN QUIET,  
BUT WARM MID MONTH WHICH INCLUDED AN 8-DAY STRETCH FROM THE 12TH TO  
THE 19TH THAT WAS PRECIPITATION FREE. THE NEXT WIDESPREAD RAIN EVENT  
OCCURRED ON THE 25TH TO 26TH, WHEN FIRST A WARM FRONT AND THEN A  
COLD FRONT CROSSED THE REGION. THIS SYSTEM BROUGHT AN ADDITIONAL ONE  
TO TWO INCHES OF RAIN TO WESTERN NEW YORK. AHEAD OF THE COLD FRONT  
SEVERAL THUNDERSTORMS BROUGHT DOWN NUMEROUS TREES ACROSS THE HILLS  
OF SW NYS. THE MONTH CLOSED ON A COLD NOTE WITH HIGH TEMPERATURES  
ONLY IN THE UPPER 50S ACROSS WESTERN NEW YORK.  
 
WINDS WERE NEAR NORMAL FOR THE MONTH. THE STRONGEST WIND GUST WAS 40  
MPH ON THE 21ST.  
 
IN ALL A QUIET AND WARM MONTH, WITH WELL SPACED LARGER RAIN EVENTS.  
 

 
 
THOMAS  
 

 
 
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