Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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412 CXUS51 KBUF 021514 CLMROC CLIMATE REPORT NATIONAL WEATHER SERVICE BUFFALO NY 338 PM EDT WED JUN 1 2016 ................................... ...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF MAY 2016... CLIMATE NORMAL PERIOD 1981 TO 2010 CLIMATE RECORD PERIOD 1871 TO 2016 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 91 05/28 92 05/09 LOWEST 35 05/10 32 05/23 AVG. MAXIMUM 69.6 67.6 2.0 75.6 AVG. MINIMUM 47.4 46.3 1.1 52.3 MEAN 58.5 57.0 1.5 64.0 DAYS MAX >= 90 1 0.2 0.8 2 DAYS MAX <= 32 0 0.0 0.0 0 DAYS MIN <= 32 0 0.6 -0.6 1 DAYS MIN <= 0 0 0.0 0.0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 6.87 1894 MINIMUM 0.24 2007 TOTALS 2.93 2.87 0.06 3.41 DAYS >= .01 11 12 DAYS >= .10 4 8 DAYS >= .50 1 2 DAYS >= 1.00 1 1 GREATEST 24 HR. TOTAL 1.48 05/29 TO 05/29 05/30 TO 05/31 05/28 TO 05/29 05/31 TO 05/31 05/29 TO 05/29 05/31 TO 05/31 SNOWFALL (INCHES) RECORDS TOTAL 10.9 1989 TOTALS T 0.4 -0.4 0.0 SINCE 7/1 63.7 99.5 -35.8 101.9 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 T 05/15 TO 05/15 05/31 TO 05/31 05/31 TO 05/31 05/31 TO 05/31 DEGREE_DAYS HEATING TOTAL 255 275 -20 128 SINCE 7/1 5608 6578 -970 6814 COOLING TOTAL 62 26 36 103 SINCE 1/1 62 30 32 103 .................................................. WIND (MPH) AVERAGE WIND SPEED 7.8 HIGHEST WIND SPEED/DIRECTION 32/250 HIGHEST GUST SPEED/DIRECTION 41/270 DATE 05/14 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) 64 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 1 MIXED PRECIP 0 HEAVY RAIN 3 RAIN 4 LIGHT RAIN 16 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 0 HEAVY SNOW 0 SNOW 1 LIGHT SNOW 0 SLEET 1 FOG 9 FOG W/VIS <= 1/4 MILE 2 HAZE 0 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && ...CONTINUATION OF DRY WEATHER INTO MAY... FREQUENT COOL PERIODS THE FIRST THREE WEEKS OF MAY YIELDED TO ABUNDANT SUNSHINE THE LAST 10 DAYS OF THE MONTH. SUMMER`S WARMTH AND HUMIDITY ALSO INCREASED THE FINAL 10 DAYS OF THE MONTH. PRECIPITATION FOR THE MONTH WAS NEAR NORMAL. THE TEMPERATURE AVERAGED 58.5F DEGREES THIS MONTH WHICH IS 1.5 DEGREES ABOVE NORMAL. THERE WERE 14 DAYS THAT AVERAGED BELOW NORMAL THIS MONTH...WITH ALL DAYS FALLING WITHIN THE FIRST THREE WEEKS OF MAY. ROCHESTER REACHED ITS FIRST 80F DEGREE READING ON MAY 12TH WHICH IS ABOUT 2 WEEKS AFTER NORMAL. THE FIRST 90F READING OCCURRED THIS MONTH AS WELL...WHEN ON SATURDAY MAY 28TH THE THERMOMETER ROSE TO 91F. THIS IS ABOUT 3 WEEKS BEFORE NORMAL. THERE WERE NO NEW TEMPERATURE RECORDS ESTABLISHED THIS MONTH. PRECIPITATION FINISHED ABOVE NORMAL IN MAY...THOUGH THIS MAY BE A BIT DECEPTIVE OF THE MONTH AS A WHOLE. HALF OF THIS TOTAL OCCURRED DURING A DRENCHING DOWNPOUR ON SUNDAY MAY 29TH...WHEN 1.48 INCHES OF RAIN OCCURRED. THROUGH A GOOD PORTION OF THE MONTH PRECIPITATION WAS AVERAGING BELOW NORMAL...THIS A CARRY OVER FROM APRIL WHICH WAS ALSO A DRY MONTH. ON SUNDAY THE 15TH UNDER AN UPPER LEVEL LOW LIGHT SNOW MIXED IN WITH THE RAIN...ENOUGH SNOW THAT A LIGHT DUSTING COVERED THE GROUND. THIS WAS THE FIRST SNOW IN MAY SINCE 2013. THE OVERALL PATTERN THIS MONTH FEATURED A DEEP TROUGH ACROSS THE EAST COAST...AND RIDGE OF HIGH PRESSURE OVER THE WEST COAST. ANOMALOUS POSITIVE HEIGHTS IN THE MID LEVELS OVER GREENLAND FORCED ANY AREAS OF LOW PRESSURE OVER THE EAST TO STALL...WHICH LINGERED COOL DAYS...THAT WERE AT TIMES DAMP THE FIRST HALF OF MAY. THE FIRST AREA OF LOW PRESSURE SPIRALED OVER THE NORTHEAST THE FIRST FEW DAYS OF MAY...BRINGING LIGHT RAIN ACROSS WESTERN NEW YORK. A SECOND LOW FORMED THE SECOND WEEK IN MAY...THIS CLOSER TO THE SOUTHERN MID ATLANTIC REGION. THIS FEATURE STILL PRODUCED LIGHT RAIN SHOWERS ON A FEW DAYS OF THE SECOND WEEK OF MAY...WHILE ALSO CONTINUING THE BELOW NORMAL TEMPERATURE TREND. ON THE 14TH A COLD FRONT SWEPT ACROSS THE REGION WITH A FEW RAIN SHOWERS. A MUCH COLDER AIRMASS BEHIND THE FRONT DROPPED ACROSS THE EASTERN GREAT LAKES REGION ON THE 15TH...PRODUCING A FEW SHOWERS OF BOTH RAIN AND SNOW. THIS COOL AIRMASS AND ASSOCIATED TROUGH OF LOW PRESSURE ALOFT SLOWLY EXITED THE REGION THROUGH THE THIRD WEEK IN MAY. FOLLOWING THIS...WARMTH THAT HAD BEEN BUILDING OVER THE WEST BEGAN TO SHIFT EASTWARD. ABOVE NORMAL WARMTH FINALLY REACHED THE EASTERN GREAT LAKES REGION BY THE END OF THE THIRD WEEK OF MAY. THIS WARMTH CONTINUED TO BUILD UNTIL SATURDAY THE 28TH. SEVERAL HEAVY SHOWERS AND THUNDERSTORMS FORMED ON BOTH THE 28TH AND 29TH. ON SUNDAY THE 29TH A HEAVY DELUGE FROM A THUNDERSTORM PRODUCED NEAR AN INCH AND A HALF OF RAINFALL ACROSS THE ROCHESTER AREA. IN ALL...AFTER A COOL START TO MAY...SUMMERS WARMTH REACHED THE REGION IN TIME FOR THE MEMORIAL DAY HOLIDAY WEEKEND. SPRING STATS... THE METEOROLOGICAL MONTHS OF MARCH-APRIL-MAY STARTED MILD AND RELATIVELY SNOW FREE. BY EARLY APRIL HOWEVER A RETURN TO LATE WINTER`S CHILL OCCURRED...THIS ALSO ACCOMPANIED BY A FEW INSTANCES OF SNOW. THE APRIL SNOW WAS MORE THAN THE TYPICAL SNOWY MONTHS OF NOVEMBER...DECEMBER AND MARCH...AND WAS THE GREATEST APRIL SNOW SINCE 1995. AFTER A COOL START TO MAY MUCH WARMER TEMPERATURES WERE RECORDED OVER THE FINAL HALF OF THE MONTH. PRECIPITATION WHICH STARTED AROUND NORMAL THROUGH MARCH WAS LACKING FOR MUCH OF THE FINAL TWO MONTHS OF SPRING. THIS LED TO THE GROUND BECOMING DRY...AS SPRING`S VEGETATION QUICKLY USED WHAT WATER WAS STORED FROM EARLY SPRING. TEMPERATURE............47.0F (+1.1) PRECIPITATION..........6.31" (-1.79) SNOW...................12.0" (-8.6) && THOMAS $$

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