Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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000 CXUS51 KBUF 091555 CCA CLMROC CLIMATE REPORT NATIONAL WEATHER SERVICE BUFFALO NY 142 PM EDT THU JUN 1 2017 ................................... ...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF MAY 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 94 05/30/1987 05/14/1974 LOW 26 05/02/1979 05/07/1970 HIGHEST 87 05/18 91 05/28 LOWEST 37 05/10 35 05/10 05/09 05/08 AVG. MAXIMUM 65.9 67.6 -1.7 69.6 AVG. MINIMUM 48.2 46.3 1.9 47.4 MEAN 57.0 57.0 0.0 58.5 DAYS MAX >= 90 0 0.2 -0.2 1 DAYS MAX <= 32 0 0.0 0.0 0 DAYS MIN <= 32 0 0.6 -0.6 0 DAYS MIN <= 0 0 0.0 0.0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 6.87 1894 MINIMUM 0.24 2007 TOTALS 5.29 2.87 2.42 2.93 DAYS >= .01 16 11 DAYS >= .10 8 4 DAYS >= .50 4 1 DAYS >= 1.00 2 1 GREATEST 24 HR. TOTAL 1.59 05/25 TO 05/25 SNOWFALL (INCHES) RECORDS TOTAL 10.9 1989 TOTALS 0.0 0.4 -0.4 T SINCE 7/1 107.1 99.5 7.6 63.7 SNOWDEPTH AVG. 0 MM MM 0 DAYS >= 1.0 0 0.1 -0.1 0 GREATEST SNOW DEPTH 0 MM 0 MM 24 HR TOTAL 0.0 DEGREE_DAYS HEATING TOTAL 265 275 -10 255 SINCE 7/1 5532 6578 -1046 5608 COOLING TOTAL 28 26 2 62 SINCE 1/1 42 30 12 62 .......................................................... WIND (MPH) AVERAGE WIND SPEED 9.1 HIGHEST WIND SPEED/DIRECTION 36/260 DATE 05/02 HIGHEST GUST SPEED/DIRECTION 48/300 DATE 05/01 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.80 NUMBER OF DAYS FAIR 0 NUMBER OF DAYS PC 12 NUMBER OF DAYS CLOUDY 19 AVERAGE RH (PERCENT) 68 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 5 MIXED PRECIP 0 HEAVY RAIN 4 RAIN 8 LIGHT RAIN 16 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 1 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 SLEET 0 FOG 12 FOG W/VIS <= 1/4 MILE 1 HAZE 3 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && ...WET MAY, AND SECOND WETTEST SPRING IN 134 YEARS FOR ROCHESTER NEW YORK... A WET SPRING CONTINUED THROUGH THE MONTH OF MAY AS SLOW MOVING STORM SYSTEMS, AND HEAVY DOWNPOURS FROM THUNDERSTORMS CONTINUED TO SATURATE WESTERN NEW YORK. COMBINED WITH MARCH AND APRIL, THE THREE SPRING MONTHS FINISHED SECOND WETTEST ON RECORD, TRAILING ONLY THE SPRING OF 1873. THE AVERAGE AIR TEMPERATURE FOR MAY WAS 57.0F WHICH IS EXACTLY NORMAL. MUCH OF THE FIRST HALF OF THE MONTH REMAINED BELOW NORMAL, WITH THE COOLEST STRETCH THIS MONTH ON THE 8TH THROUGH 10TH WHEN THE MERCURY DIPPED TO 37F EACH DAY. DAYS TRENDED ABOVE NORMAL FOR THE END OF THE MONTH, INCLUDING 4 STRAIGHT DAYS IN THE 70S TO FINISH THE MEMORIAL DAY WEEKEND AND MONTH. THERE WERE NO RECORDS OR EXTREMES THIS MAY, AND THE WARMEST DAY THIS MONTH WAS 87F ON THE 18TH. PRECIPITATION FOR THE MONTH FINISHED AT 5.29 INCHES, WHICH IS ALMOST TWO AND A HALF INCHES ABOVE NORMAL. THERE WAS ONE NEW PRECIPITATION RECORD, WITH THE 1.24 INCHES OF RAIN ON THE 1ST SETTING A NEW RECORD FOR THE DATE. THERE WERE 5 DAYS WITH THUNDERSTORMS, WITH EACH EVENT CONTRIBUTING TO THE 16TH WETTEST MAY ON RECORD. OVERALL THIS WET MONTH PRODUCED 4 MORE DAYS THAN NORMAL WITH MEASURABLE PRECIPITATION. THE BEGINNING OF THE MONTH BEGAN ON THE STORMY SIDE, WITH NUMEROUS SEVERE THUNDERSTORMS BRINGING LOCALIZED DAMAGING WIND GUSTS ACROSS WESTERN NEW YORK. IN ADDITION HEAVY RAIN PASSED ACROSS THE REGION WITH OVER AN INCH OF RAIN MEASURED AT THE ROCHESTER AIRPORT. AFTER A FEW DAYS OF COOL WEATHER AND RESPITE FROM THE RAIN, ANOTHER STORM SYSTEM CUT THROUGH THE OHIO VALLEY AND PRODUCED ADDITIONAL WIDESPREAD SOAKING RAIN FROM THE 4TH THROUGH THE 6TH. COOL WEATHER AND CLOUDY DAYS CONTINUED THROUGH MID-MONTH AS A DEEP UPPER LEVEL LOW REMAINED STALLED OVER QUEBEC. THE SPRING OF 2017 WAS A STARK CONTRAST TO THE PREVIOUS SPRING OF 2016 WHICH FEATURED THE ONSET OF DROUGHT CONDITIONS. LAWNS THIS YEAR REMAINED LUSH AND FLOWERS FLOURISHED UNDER THE COOL AND DAMP CONDITIONS. THE FIRST TASTE OF SUMMER THIS MONTH OCCURRED ON THE 17TH AND 18TH OF THE MONTH. WARM AIR FROM THE SOUTHWEST FLOWED OVER THE EASTERN GREAT LAKES REGION AND BROUGHT WIDESPREAD 80S, AND A FEW 90F READINGS. ANOTHER COOL POOL SETTLED OVER WESTERN NEW YORK LATER ON THE 18TH. AS THESE AIRMASSES CLASHED, SEVERE THUNDERSTORMS AGAIN FORMED, WITH SOME BEARING HAIL TO 2 INCHES IN DIAMETER ACROSS SOUTHWESTERN NEW YORK AND 2.5 INCHES SOUTHEAST OF LAKE ONTARIO. ANOTHER SLOW MOVING LOW FROM THE SOUTH PASSED NEAR THE REGION ON THE 25TH, BRINGING AN ALL-DAY RAIN EVENT THAT YIELDED AN INCH TO TWO INCHES OF RAIN TO WESTERN NEW YORK. A WEAK COLD FRONT BROUGHT SOME SHOWERS LATER SUNDAY AND INTO THE MORNING HOURS OF MEMORIAL DAY, THE 29TH. MUCH OF THE RAIN ENDED BY TIME FESTIVITIES BEGAN LATER ON IN THE DAY MONDAY. WINDS FOR THE MONTH FINISHED ABOVE NORMAL (+0.3 MPH), FINISHING WITH AN AVERAGE SPEED OF 9.1 MPH. THE PEAK WIND GUSTS FOR THE MONTH OCCURRED IN STORMS ON THE 1ST WITH 48 MPH REGISTERED. IN ALL, AND WHAT HAS BEEN THE THEME THIS SPRING, A WET MONTH LACKING ANY SIGNIFICANT, LENGTHY WARM SPELLS. && THOMAS $$

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