Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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000 CXUS51 KBUF 060052 CLMROC CLIMATE REPORT NATIONAL WEATHER SERVICE BUFFALO NY 607 PM EDT MON JUN 1 2015 ................................... ...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF MAY 2015... CLIMATE NORMAL PERIOD 1981 TO 2010 CLIMATE RECORD PERIOD 1871 TO 2015 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 92 05/09 87 05/13 05/09 LOWEST 32 05/23 39 05/05 AVG. MAXIMUM 75.6 67.6 8.0 69.7 AVG. MINIMUM 52.3 46.3 6.0 49.9 MEAN 64.0 57.0 7.0 59.8 DAYS MAX >= 90 2 0.2 1.8 0 DAYS MAX <= 32 0 0.0 0.0 0 DAYS MIN <= 32 1 0.6 0.4 0 DAYS MIN <= 0 0 0.0 0.0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 6.87 1894 MINIMUM 0.24 2007 TOTALS 3.41 2.87 0.54 3.17 DAYS >= .01 12 15 DAYS >= .10 8 7 DAYS >= .50 2 1 DAYS >= 1.00 1 1 GREATEST 24 HR. TOTAL 1.64 05/30 TO 05/31 SNOWFALL (INCHES) RECORDS TOTAL 10.9 1989 TOTALS 0.0 0.4 -0.4 T SINCE 7/1 101.9 99.5 2.4 112.7 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 05/31 TO 05/31 05/31 TO 05/31 DEGREE_DAYS HEATING TOTAL 128 275 -147 191 SINCE 7/1 6814 6578 236 6986 COOLING TOTAL 103 26 77 38 SINCE 1/1 103 30 73 39 .................................................. WIND (MPH) AVERAGE WIND SPEED 8.8 HIGHEST WIND SPEED/DIRECTION 39/260 DATE 05/12 HIGHEST GUST SPEED/DIRECTION 51/250 DATE 05/12 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.60 NUMBER OF DAYS FAIR 5 NUMBER OF DAYS PC 16 NUMBER OF DAYS CLOUDY 10 AVERAGE RH (PERCENT) 61 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 7 MIXED PRECIP 0 HEAVY RAIN 4 RAIN 4 LIGHT RAIN 13 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 SLEET 0 FOG 14 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. && ...VERY WARM MAY... MID SUMMERS WARMTH WAS FELT THROUGH THE GENESEE VALLEY IN MAY...WITH MANY VERY WARM TO HOT DAYS ADDING UP TO THE WARMEST MONTH OF MAY ON RECORD. ABUNDANT SUNNY DAYS...A DRYING GROUND AND A MEAN SOUTHWESTERLY FLOW LED TO THE WARMEST MAY ON RECORD. THE MEAN TEMPERATURES THIS MONTH WAS 64.06F DEGREES WHICH IS 7.0F DEGREES ABOVE NORMAL. THERE WERE TWO RECORD HIGH TEMPERATURES SET THIS MONTH...FALLING CONSECUTIVELY ON THE 8TH AND 9TH WITH READINGS OF 90F AND 92F RESPECTIVELY. THERE WAS ALSO A RECORD WARM MINIMUM TEMPERATURE SET ON THE 10TH WITH A READING OF 67F DEGREES. THE TWO DAYS IN THE 90S ON THE 8TH AND 9TH WERE THE 2ND EARLIEST CONSECUTIVE 90S IN RECORDED HISTORY. PRECIPITATION THIS MONTH TOTALED 3.41 INCHES WHICH IS A HALF INCH ABOVE NORMAL. THIS TOTAL IS A BIT DECEIVING OF THE MONTH AS A WHOLE AS NEARLY HALF THIS TOTAL FELL WITHIN THE LAST 30 HOURS OF THE MONTH. THERE WAS ONE PRECIPITATION RECORD ESTABLISHED...THE 1.64 INCHES OF RAIN THAT FELL ON THE LAST DAY OF THE MONTH TIED AN OLD RECORD FOR THE DATE SET BACK IN 1889. MANY OF MAY`S DAILY TEMPERATURES WERE ABOVE NORMAL WITH 24 DAYS AVERAGING ABOVE NORMAL COMPARED TO 7 DAYS BELOW NORMAL. THESE WARM TEMPERATURES IN CONJUNCTION WITH ALL THE SUNSHINE AND RAIN-FREE DAYS MADE THIS MONTH A VERY PLEASANT MONTH. THERE WERE TWO NOTABLE WEATHER FEATURES THIS MONTH. THE FIRST WAS A LATE FROST/FREEZE ACROSS WESTERN NEW YORK ON THE MORNING OF THE 23RD. FOLLOWING A COOL AND CLOUDY DAY IN THE LOW 60S...SKIES CLEARED WITH EXCELLENT RADIATIONAL COOLING CONDITIONS. TEMPERATURES DROPPED TO 32F DEGREES SATURDAY MORNING AT THE AIRPORT WITH WIDESPREAD FROST AND FREEZE CONDITIONS ACROSS THE METROPOLITAN AREA OF ROCHESTER. THIS WAS THE LATEST FREEZE AT THE AIRPORT SINCE MAY OF 1956...WHICH HAD FREEZING TEMPERATURES ON BOTH THE 24TH AND 25TH. VEGETATION SPRUNG FORTH IN THE WARM MONTH OF MAY...BUT PROLONGED DRY STRETCHES AND SUNNY DAYS EVENTUALLY STARTED TO DRY THE LOW BRUSH AND GRASSES. THIS DRY PATTERN ENDED ON THE LAST DAY OF THE MONTH WHEN A MOISTURE LADEN SLOW MOVING COLD FRONT MOVED THROUGH THE REGION WITH SIGNIFICANT RAINFALL. SEVERAL WAVES ALONG THIS COLD FRONT BROUGHT NEARLY TWO INCHES OF RAINFALL TO THE GENESEE VALLEY THE LAST 30 HOURS OF THE MONTH...A RAINFALL EVENT THAT WAS WELCOMED EVEN THOUGH THE RAIN FELL ON A WEEKEND. THIS EVENT PRODUCED NO SIGNIFICANT FLOODING IN THE ROCHESTER AREA AS ANTECEDENT DRY CONDITIONS ALLOWED THE GROUND TO ABSORB A PORTION OF THE RAIN THAT FELL...WITH REMAINING RUNOFF CONTAINED WITHIN ALL CREEKS AND RIVERS. IN ALL A PLEASANT SPRING MONTH FOR WESTERN NEW YORK. SPRING STATS... SPRING STARTED COOL...WITH AIR TEMPERATURES IN MARCH WELL BELOW NORMAL. AFTER A NEAR NORMAL MONTH IN APRIL TEMPERATURE-WISE THE MONTH OF MAY BROUGHT SUMMER LIKE WARMTH ACROSS WESTERN NEW YORK. AFTER A SLOW START PRECIPITATION WISE TO SPRING...SEVERAL LATE THUNDERSTORMS AND RAIN EVENTS BROUGHT SPRINGS FINAL PRECIPITATION TOTAL TO WITHIN TWO THIRDS OF AN INCH OF NORMAL. HERE ARE SOME SPRING STATS FOR METEOROLOGICAL SPRING WHICH IS DEFINED AS THE MONTHS OF MARCH...APRIL AND MAY. TEMPERATURE.......... 47.2F (+1.3) PRECIPITATION........ 7.45" (-0.65") SNOW.................13.3" (-7.3") && THOMAS $$

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