Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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000 CXUS51 KBUF 051218 CLMROC CLIMATE REPORT NATIONAL WEATHER SERVICE BUFFALO NY 113 PM EDT TUE AUG 1 2017 ................................... ...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF JULY 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 102 07/10/1936 07/09/1936 LOW 42 07/09/1963 HIGHEST 87 07/19 94 07/13 LOWEST 54 07/29 53 07/20 07/09 07/05 AVG. MAXIMUM 80.5 81.0 -0.5 85.8 AVG. MINIMUM 61.7 60.7 1.0 63.7 MEAN 71.1 70.8 0.3 74.8 DAYS MAX >= 90 0 2.3 -2.3 9 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 9.70 1947 MINIMUM 0.43 1933 TOTALS 4.29 3.33 0.96 1.22 DAYS >= .01 13 7 DAYS >= .10 9 6 DAYS >= .50 3 0 DAYS >= 1.00 0 0 GREATEST 24 HR. TOTAL 0.94 07/12 TO 07/12 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 DEGREE_DAYS HEATING TOTAL 2 12 -10 0 SINCE 7/1 2 12 -10 0 COOLING TOTAL 198 193 5 313 SINCE 1/1 373 329 44 504 .................................................. WIND (MPH) AVERAGE WIND SPEED 6.8 HIGHEST WIND SPEED/DIRECTION 24/260 DATE 07/02, 07/01 HIGHEST GUST SPEED/DIRECTION 35/260 DATE 07/01 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.60 NUMBER OF DAYS FAIR 4 NUMBER OF DAYS PC 17 NUMBER OF DAYS CLOUDY 10 AVERAGE RH (PERCENT) 73 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 9 MIXED PRECIP 0 HEAVY RAIN 8 RAIN 7 LIGHT RAIN 15 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 SLEET 0 FOG 17 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. && ...FAIRLY TYPICAL JULY... JULY FEATURED TYPICAL MID-SUMMER CONDITIONS WITH 24 DAYS THIS MONTH WITHIN 4 DEGREES OF NORMAL TEMPERATURE. THERE WERE NO MAJOR EXTREMES IN THE TEMPERATURES THOUGH SEVERAL DAYS THROUGH THE MONTH EXHIBITED SUMMER`S HIGH HUMIDITY. THERE WERE TWO WEATHER EVENTS MID MONTH THAT BROUGHT SIGNIFICANT WEATHER (FLASH FLOODING, TORNADOES) TO WESTERN NEW YORK. THE AVERAGE TEMPERATURES THIS MONTH WAS 71.1F WHICH IS THREE TENTHS OF A DEGREE ABOVE NORMAL. THE WARMEST DAY THIS MONTH WAS 87F ON JULY 19TH. THERE WERE NO 90 DEGREE READINGS THIS MONTH FOR THE SECOND TIME THIS DECADE, WITH 2014 THE OTHER YEAR WITHOUT A 90 DEGREE READING IN JULY. PRECIPITATION FOR THE MONTH TOTALED 4.29 INCHES, WHICH IS ABOUT AN INCH ABOVE NORMAL. SEVERAL THUNDERSTORMS BROUGHT HEAVY RAIN ACROSS THE GENESEE VALLEY, WITH AN EVENT ON THE 12TH FEATURING THE GREATEST CALENDAR DAY RAINFALL EVENT THIS MONTH OF 0.94 INCHES. THERE WERE 9 THUNDERSTORMS THIS MONTH, THREE MORE THAN NORMAL. THERE WERE TWO SIGNIFICANT EVENTS IN JULY FOR WESTERN NEW YORK. THE FIRST ON THE 12TH-13TH WHEN A WARM FRONT LIFTED ACROSS WESTERN NEW YORK. ON WEDNESDAY THE 12TH, SEVERAL INCHES OF RAIN FELL ACROSS WESTERN NEW YORK, INCLUDING AREAS OF ONE TO TWO INCHES ACROSS THE SOUTHERN TIER, AND JUST TO THE SOUTH OF ROCHESTER ACROSS GENESEE AND SOUTHERN MONROE COUNTIES. THROUGH THE MORNING HOURS OF THE 13TH ANOTHER WAVE A HEAVY RAIN FELL ALONG THE WARM FRONT BOUNDARY, ACROSS BUFFALO AND THE NIAGARA FRONTIER. THOUGH THE HEAVIEST OF RAIN AND MORE SIGNIFICANT FLOODING REMAINED JUST TO THE SOUTH AND WEST OF ROCHESTER, THERE WERE ROAD CLOSURES ACROSS LIVINGSTON AND ONTARIO COUNTIES. THE SECOND EVENT WAS JUST A WEEK LATER, ON THE 20TH, AND WAS A NORTHWEST FLOW EVENT IN WHICH A COMPLEX OF TORNADIC THUNDERSTORMS DROPPED ACROSS THE NIAGARA FRONTIER. FARTHER TO THE EAST ACROSS THE GENESEE VALLEY, THESE STORMS PRODUCED HEAVY RAIN WITH A HALF TO ONE INCH OF RAIN FALLING ACROSS THE VALLEY. THESE THUNDERSTORMS, INITIALLY BRINGING DAMAGING WINDS, INTERACTED WITH A FRONTAL BOUNDARY DRAPED ACROSS THE REGION TO SPAWN FOUR TORNADOES. THE FIRST TWO TORNADOES WERE IN SOUTHERN ERIE COUNTY AND WERE THE FIRST TORNADOES IN ERIE COUNTY SINCE 2006. THE FIRST TORNADO CROSSED HAMBURG, INCLUDING THE ERIE COUNTY FAIRGROUNDS, WHILE THE SECOND TORNADO THIS DAY CROSSED HOLLAND. IN ADDITION TO DOWNING MANY TREES, THE TORNADO THROUGH HAMBURG CAUSED DAMAGE TO THE FAIRGROUNDS WHILE ALSO BLOWING OUT THE WINDOWS OF HUNDREDS OF CARS. A THIRD AND FOURTH TORNADO DEVELOPED LATER ACROSS ALLEGANY COUNTY IN THE TOWNS OF RUSHFORD AND ANGELICA. THESE TORNADOES UPROOTED TREES, WITH THE FOURTH TORNADO ACROSS ANGELICA ALSO DESTROYING A BARN AND SEVERAL SHEDS. WINDS WERE LIGHT FOR THE MONTH, AVERAGING 6.8 MPH WHICH IS 0.6 MPH BELOW NORMAL. LAKE ONTARIO CARRIED OUT ITS TYPICAL LAKE TEMPERATURE FLUCTUATIONS THROUGH THE MONTH, PEAKING AT 72F ON THE 10TH AND 22ND. IN ALL IT WAS PLEASANT THROUGH MUCH OF THE MONTH. && THOMAS $$

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