Climatological Report (Monthly)
Issued by NWS Buffalo, NY
Issued by NWS Buffalo, NY
900
CXUS51 KBUF 030116
CLMROC
CLIMATE REPORT
NATIONAL WEATHER SERVICE BUFFALO NY
1002 AM EDT THU OCT 01 2026
...................................
...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2026...
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1871 TO 2026
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 09/02 84 09/18
LOWEST 40 09/25 43 09/08
AVG. MAXIMUM 72.4 73.6 -1.2 75.8
AVG. MINIMUM 55.1 53.6 1.5 51.7
MEAN 63.8 63.6 0.2 63.8
DAYS MAX >= 90 0 0.9 -0.9 0
DAYS MAX <= 32 0 0.0 0.0 0
DAYS MIN <= 32 0 0.1 -0.1 0
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 6.30 1977
MINIMUM 0.28 1960
TOTALS 2.54 3.18 -0.64 0.30
DAYS >= .01 8 4
DAYS >= .10 5 1
DAYS >= .50 3 0
DAYS >= 1.00 0 0
GREATEST
24 HR. TOTAL 1.27 08/31 TO 09/01 0.17 09/04 TO 09/04
SNOWFALL (INCHES)
RECORDS
TOTAL MM MM
TOTALS 0.0 0.0 0.0 0.0
SINCE 7/1 0.0 0.0 0.0 MM
SNOWDEPTH AVG. 0 0
DAYS >= 1.0 0 0.0 0.0 0
DAYS >= 0.1 0 0
GREATEST
SNOW DEPTH 0 0 MM
24 HR TOTAL MM MM
DEGREE DAYS
HEATING TOTAL 98 114 -16 64
SINCE 7/1 108 132 -24 MM
COOLING TOTAL 68 72 -4 33
SINCE 1/1 623 668 -45 MM
................................................................
WIND (MPH)
AVERAGE WIND SPEED 6.7
HIGHEST WIND SPEED/DIRECTION 29/360
HIGHEST GUST SPEED/DIRECTION 35/360 DATE 09/02
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.64
NUMBER OF DAYS FAIR 5
NUMBER OF DAYS PC 12
NUMBER OF DAYS CLOUDY 11
AVERAGE RH (PERCENT) 77
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 2 MIXED PRECIP 0
HEAVY RAIN 4 RAIN 4
LIGHT RAIN 14 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 8 FOG W/VIS <= 1/4 MILE 0
HAZE 0
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
&&
... WILD START, THEN QUIET END TO SEPTEMBER ...
A VERY WARM AND INCREASINGLY HUMID AIRMASS BEGAN THE MONTH OF
SEPTEMBER, WHICH FUELED THE GREATEST CONVECTIVE EVENT OF THIS SUMMER
SEASON ON THE 2ND OF THE MONTH, WITH 6 CONFIRMED TORNADOES ACROSS
WESTERN NEW YORK. ADDITIONAL RAIN FELL ON THE 3RD BEFORE THE COLD
FRONT FINALLY PUSHED EASTWARD. THEREAFTER, RELATIVELY TYPICAL EARLY
AUTUMN CONDITIONS PREVAILED, WITH THE FINAL DAYS OF THE MONTH
SHROUDED IN CLOUDS FROM A NEARBY NOR`EASTER.
THE TEMPERATURE FOR THE MONTH OF SEPTEMBER AVERAGED 0.1F ABOVE
NORMAL, FINISHING THE MONTH AT 63.7F. THERE WERE 15 DAYS ABOVE
NORMAL, WHILE 14 DAYS FINISHED BELOW NORMAL, INCLUDING A STRETCH
FROM THE 19TH TO THE 26TH. THE WARMEST TEMPERATURE OCCURRED ON THE
2ND DAY OF THE MONTH, WITH A MAXIMUM TEMPERATURE OF 85F. THE
COOLEST TEMPERATURE OF 40F OCCURRED ON THE 25TH. THERE WERE NO
RECORDS ESTABLISHED THIS MONTH, AND THE 16 DAYS REACHING 70F OR
GREATER ARE THREE DAYS LESS THAN THE NORMAL FOR AIRPORT RECORDS.
PRECIPITATION TOTALED 2.54 INCHES FOR THE MONTH WHICH IS ABOUT SIX-
TENTHS OF AN INCH BELOW NORMAL. MUCH OF THE PRECIPITATION FELL ON 3
DATES, THE 2ND, 3RD AND 9TH ACCOUNTED FOR 83 PERCENT OF THE
PRECIPITATION THIS MONTH. THE PERIOD FROM THE 16TH TO THE 26TH
RECORDED NOTHING MORE THAN A TRACE OF RAINFALL.
A FEW THUNDERSTORMS DOTTED THE SOUTHERN TIER DURING THE AFTERNOON
HOURS ON THE 1ST OF THE MONTH. LATER THAT NIGHT, AND TOWARDS THE
MORNING HOURS OF THE 2ND, CLUSTERS OF STORMS DEVELOPED OVER THE
EASTERN GREAT LAKES, DROPPING ACROSS WESTERN NEW YORK DURING THE
MORNING HOURS. WIDESPREAD DAMAGE OCCURRED DURING THE MORNING ACROSS
ORLEANS AND GENESEE COUNTIES, WITH ISOLATED DAMAGE ACROSS THE
SOUTHERN TIER AND THROUGH WAYNE COUNTY. LATER THAT AFTERNOON
ANOTHER, MORE ROBUST ROUND OF CONVECTION OCCURRED. INITIAL STRAIGHT-
LINE WIND DAMAGING THUNDERSTORMS OCCURRED ACROSS THE WESTERN FINGER
LAKES, BEFORE A LINE OF SEVERE THUNDERSTORMS WITH EMBEDDED TORNADIC
ACTIVITY BLITZED WESTERN NEW YORK FROM THE NORTHWEST. IN ALL, 6
TORNADOES OCCURRED ACROSS WESTERN NEW YORK, INCLUDING FOR THE FIRST
TIME IN 40 YEARS A TORNADO IN ORLEANS COUNTY. OTHER TORNADOES
OCCURRED IN THE COUNTIES OF NIAGARA, GENESEE, WYOMING, LIVINGSTON
AND ALONG THE MONROE AND WAYNE COUNTY BORDERS. THIS CONVECTION ALL
OCCURRED AHEAD OF A COLD FRONT THAT REMAINED STALLED TO THE WEST OF
NEW YORK STATE THROUGH THE DAY. THIS FRONT ONLY SHIFTED INTO WESTERN
NEW YORK THE FOLLOWING DAY, AND SERVED AS A FOCUS FOR A LINE OF
NARROW BUT POWERFUL STORMS, STORMS THAT PRODUCED 3 TO 4 INCHES OF
RAIN AND RESULTED IN WIDESPREAD FLOODING ACROSS BUFFALO AND THE
NORTHERN AND EASTERN SUBURBS, WHILE RAINFALL AMOUNTS WERE GENERALLY
HELD TO UNDER AN INCH ACROSS THE ROCHESTER METRO AREA.
A MUCH-NEEDED QUIET SPELL OCCURRED FROM THE 4TH AND THROUGH THE
LABOR DAY WEEKEND. ANOTHER STORM SYSTEM PASSED ACROSS WESTERN NEW
YORK ON THE 9TH, WITH MODERATE RAIN AROUND THE ROCHESTER REGION.
MILD DAYS CONTINUED THROUGH ABOUT MID-MONTH, WHEN A PATTERN CHANGE
OCCURRED, WITH BELOW NORMAL TEMPERATURES OCCURRING FOR ABOUT A WEEK.
CLEAR SKIES ALLOWED FOR THICK DEW FORMATION MID TO LATE MONTH,
THOUGH OVERNIGHT TEMPERATURES DID NOT COOL ENOUGH FOR ANY FROST. A
NOR`EASTER BROUGHT A CANOPY OF CLOUDS ACROSS WESTERN NEW YORK
TOWARDS THE END OF THE MONTH, WITH LIGHT SHOWERS AND A PERSISTENT
DRIZZLE. THIS STORM PULLED EASTWARD ALLOWING FOR A RETURN TO SOME
SUNSHINE ON THE FINAL DAY OF THE MONTH.
GREAT LAKE WATER TEMPERATURES PEAKED AT 74F FOR THE MONTH BEFORE
UPWELLING AND LONGER AND COOLER NIGHTS ALLOWED FOR THE LAKE WATERS
TO DROP DOWN INTO THE LOWER 60S AT THE END OF THE MONTH. WINDS FOR
THE MONTH AVERAGED ABOUT A HALF A MILE BELOW NORMAL. THE STRONGEST
GUST FOR THE MONTH OCCURRED DURING THUNDERSTORMS ON THE 2ND, WITH 35
MPH RECORDED IN THE EARLY EVENING.
IN ALL, AN ACTIVE START, THEN DRY AND QUIET FINISH.
&&
THOMAS
$$