Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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045 CXUS51 KBUF 060110 CLMROC CLIMATE REPORT NATIONAL WEATHER SERVICE BUFFALO NY 822 AM EDT TUE MAY 2 2017 ................................... ...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF APRIL 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 93 04/28/1990 04/30/1970 LOW 11 04/04/1879 HIGHEST 86 04/27 77 04/21 LOWEST 30 04/02 14 04/05 AVG. MAXIMUM 61.2 56.0 5.2 52.6 AVG. MINIMUM 41.7 36.6 5.1 32.0 MEAN 51.5 46.3 5.2 42.3 DAYS MAX >= 90 0 0.0 0.0 0 DAYS MAX <= 32 0 0.2 -0.2 3 DAYS MIN <= 32 2 9.5 -7.5 16 DAYS MIN <= 0 0 0.0 0.0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 5.81 2011 MINIMUM 0.94 1884 TOTALS 4.95 2.73 2.22 1.56 DAYS >= .01 13 13 DAYS >= .10 10 7 DAYS >= .50 3 1 DAYS >= 1.00 2 0 GREATEST 24 HR. TOTAL 1.47 04/06 TO 04/07 SNOWFALL (INCHES) RECORDS TOTAL 23.8 1901 TOTALS 2.5 3.9 -1.4 8.8 SINCE 7/1 107.1 99.1 8.0 63.7 SNOWDEPTH AVG. 0 MM MM 0 DAYS >= 1.0 1 1.2 -0.2 2 GREATEST SNOW DEPTH 1 04/07 5 04/04 24 HR TOTAL 2.5 04/06 TO 04/07 DEGREE_DAYS HEATING TOTAL 411 565 -154 674 SINCE 7/1 5267 6303 -1036 5353 COOLING TOTAL 14 4 10 0 SINCE 1/1 14 4 10 0 .................................................... WIND (MPH) AVERAGE WIND SPEED 9.9 HIGHEST WIND SPEED/DIRECTION 38/260 HIGHEST GUST SPEED/DIRECTION 51/260 DATE 04/16 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.70 NUMBER OF DAYS FAIR 4 NUMBER OF DAYS PC 10 NUMBER OF DAYS CLOUDY 16 AVERAGE RH (PERCENT) 67 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 4 MIXED PRECIP 0 HEAVY RAIN 5 RAIN 6 LIGHT RAIN 15 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 0 HEAVY SNOW 0 SNOW 1 LIGHT SNOW 2 SLEET 0 FOG 14 FOG W/VIS <= 1/4 MILE 1 HAZE 1 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && ...MILD, SOGGY APRIL... ABOVE NORMAL TEMPERATURES RETURNED FOR APRIL, WHILE FEATURING A VERY WET MONTH. DESPITE THE WET MONTH, AIR TEMPERATURES FINISHED AS 5TH WARMEST FOR ANY APRIL MONTH. THE MARCH-APRIL PRECIPITATION OF 10.74 INCHES WAS THE SECOND WETTEST IN HISTORY, TRAILING ONLY MARCH-APRIL OF 1991 WHICH TOTALED 11.80 INCHES OF PRECIPITATION. THE AVERAGE TEMPERATURE FOR APRIL FINISHED AT 51.5F, WHICH IS THE 5TH WARMEST APRIL ON RECORD, AND 1.1 DEGREES FROM THE WARMEST APRIL ON RECORD (52.6F/1878). THE WARMEST DAY THIS MONTH WAS THE 27TH WHEN A RECORD TYING 86F READING WAS REACHED. THIS TIES WITH 1990 FOR THE WARMEST 27TH ON RECORD. THIS 86F WAS ALSO TIED FOR THE 9TH WARMEST APRIL DAY IN ROCHESTER`S RECORD KEEPING. THERE WERE 7 DAYS ABOVE 70F THIS MONTH, THREE MORE THAN NORMAL. PRECIPITATION FOR THE MONTH FINISHED AT 4.95 INCHES, WHICH IS THE 4TH WETTEST APRIL ON RECORD, AND MORE THAN TWO INCHES ABOVE NORMAL. CONTRIBUTING TO THIS WET APRIL WERE THREE EXTREME PRECIPITATION EVENTS. THE FIRST, A COMBINATION OF RAIN AND SNOW, WAS ON THE 6TH AND 7TH WHERE OVER AN INCH AND A HALF OF PRECIPITATION FELL ACROSS THE GENESEE VALLEY. THE SECOND, ON THE 20TH ALSO FEATURED OVER AN INCH OF PRECIPITATION. A THIRD EVENT ON THE LAST DAY OF THE MONTH FEATURED OVER AN INCH OF RAINFALL ACROSS THE NORTHERN HALF OF MONROE COUNTY, WITH AROUND A HALF AN INCH FALLING NEAR THE AIRPORT. THIS 0.41 INCHES BY THE END OF THE 30TH PUSHED ROCHESTER INTO 4TH PLACE FOR WETTEST APRIL ON RECORD. THERE WAS ONE SNOW EVENT ON THE 6TH AND 7TH WITH 2.5 INCHES OF SNOW FALLING. ALTHOUGH APRIL WAS A THE TOP TEN WETTEST MONTH, THE 13 DAYS OF MEASURABLE PRECIPITATION WAS EXACTLY NORMAL. THE SYNOPTIC PATTERN AS A WHOLE THIS MONTH FEATURED A PROGRESSIVE FLOW, WITH ANOMALOUS HIGH TEMPERATURES AND HEIGHTS ACROSS THE NORTHEAST. WHILE THERE WAS ONE AMPLIFIED PERIOD THAT TAPPED INTO MUCH COLDER AIR, WITH ACCUMULATING SNOW ON THE 6TH AND 7TH, MUCH OF THE MONTH FEATURED STORM SYSTEMS TRACKING ACROSS THE OHIO VALLEY, BRINGING PERIODS OF RAIN AND THUNDERSTORMS ACROSS WESTERN NEW YORK. THERE WERE NO LONG DRY STRETCHES THIS MONTH, WITH JUST THREE DAYS THE GREATEST STRETCH WITHOUT A TRACE OF PRECIPITATION. STORMS THAT BROUGHT ABUNDANT PRECIPITATION TO WESTERN NEW YORK OCCURRED ON THE 3RD-4TH, 6TH-7TH, 19TH-20TH AND 30TH OF THE MONTH. THESE STORM SYSTEM BROUGHT SOME RIVER AND CREEK FLOODING TO THE GENESEE VALLEY ON THE 7TH AND 8TH, WHILE AFTER THE EVENT ON THE 19TH AND 20TH SEVERAL CREEKS AND STREAMS THROUGHOUT ALL OF WESTERN NEW YORK WENT INTO MINOR FLOOD STAGE. THE DRIEST WEEK THIS MONTH WAS THE WEEK LEADING UP TO EASTERN SUNDAY THE 16TH, WITH GENERALLY LESS THAN A QUARTER OF AN INCH OF PRECIPITATION FALLING ACROSS WESTERN NEW YORK. THE 16TH ALSO HAD THE GREATEST WIND GUST, THIS OF 51 MPH DURING THE EARLY AFTERNOON HOURS. THERE WERE FOUR THUNDERSTORMS THIS MONTH WHICH IS DOUBLE THE NORM. IN ALL ANOTHER VERY WET SPRING MONTH, BUT WITH MILD TEMPERATURES. && THOMAS $$

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