Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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000 CXUS51 KBUF 050423 CLMROC CLIMATE REPORT NATIONAL WEATHER SERVICE BUFFALO NY 622 AM EST FRI JAN 1 2016 ................................... ...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 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 72 12/03/1982 LOW -16 12/20/1942 HIGHEST 69 12/14 57 12/24 LOWEST 24 12/28 16 12/31 AVG. MAXIMUM 49.3 36.5 12.8 39.9 AVG. MINIMUM 35.1 23.5 11.6 28.9 MEAN 42.2 30.0 12.2 34.4 DAYS MAX >= 90 0 0.0 0.0 0 DAYS MAX <= 32 0 10.4 -10.4 6 DAYS MIN <= 32 10 24.9 -14.9 23 DAYS MIN <= 0 0 0.4 -0.4 0 PRECIPITATION (INCHES) RECORD MAXIMUM 6.17 1878 MINIMUM 0.62 1958 TOTALS 2.73 2.63 0.10 2.31 DAYS >= .01 15 16 DAYS >= .10 9 7 DAYS >= .50 2 1 DAYS >= 1.00 0 0 GREATEST 24 HR. TOTAL 0.68 12/28 TO 12/29 SNOWFALL (INCHES) RECORDS TOTAL 46.5 2010 TOTALS 2.3 21.8 -19.5 16.6 SINCE 7/1 3.5 29.2 -25.7 25.7 SNOWDEPTH AVG. 0 3 -3 1 DAYS >= 1.0 1 6.3 -5.3 4 GREATEST SNOW DEPTH 2 12/29 11 12/11 24 HR TOTAL 2.0 12/28 DEGREE_DAYS HEATING TOTAL 699 1085 -386 940 SINCE 7/1 1739 2453 -714 2220 COOLING TOTAL 0 0 0 0 SINCE 1/1 698 539 159 542 ................................................. WIND (MPH) AVERAGE WIND SPEED 8.6 HIGHEST WIND SPEED/DIRECTION 39/270 HIGHEST GUST SPEED/DIRECTION 51/240 DATE 12/24 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.80 NUMBER OF DAYS FAIR 0 NUMBER OF DAYS PC 10 NUMBER OF DAYS CLOUDY 21 AVERAGE RH (PERCENT) 73 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 0 MIXED PRECIP 0 HEAVY RAIN 0 RAIN 6 LIGHT RAIN 17 FREEZING RAIN 1 LT FREEZING RAIN 2 HAIL 0 HEAVY SNOW 0 SNOW 2 LIGHT SNOW 5 SLEET 2 FOG 19 FOG W/VIS <= 1/4 MILE 2 HAZE 1 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && ...REMARKABLE WARMTH...LACK OF SNOW THIS DECEMBER... DECEMBER 2015 FEATURED WELL ABOVE NORMAL AIR TEMPERATURES THE ENTIRE MONTH...WITH ALL DAYS FINISHING ABOVE NORMAL. UNPRECEDENTED WARMTH WITHIN A STRONG EL NINO GLOBAL PATTERN BROUGHT DECEMBER ITS WARMEST MEAN AIR TEMPERATURE ON RECORD...SMASHING THE PREVIOUS RECORD. THE AVERAGE AIR TEMPERATURE THIS MONTH WAS 42.2F WHICH IS AMAZINGLY 12.2F DEGREES ABOVE NORMAL...AND ECLIPSED THE PREVIOUS WARMEST DECEMBER BY 3.2F DEGREES. SEVERAL DAILY TEMPERATURE RECORDS WERE SET THIS MONTH INCLUDING NEW RECORD HIGHS FOR THE 11TH, 14TH...23RD AND 24TH. THE 69 DEGREES ON THE 14TH WAS THE SIXTH WARMEST DECEMBER DAY ON RECORD. THERE WERE 16 DAYS WITH HIGH TEMPERATURES ABOVE 50F...GREATEST NUMBER ON DECEMBER RECORD...AND ECLIPSED THE PRIOR RECORD SET BACK IN 1982 BY 5 DAYS. THE AVERAGE NUMBER OF DAYS IN DECEMBER ABOVE 50F IS 3 DAYS. THERE WERE 22 DAYS WITH THE AIR TEMPERATURE REMAINING AT OR ABOVE FREEZING. THIS ALSO IS THE GREATEST NUMBER OF DAYS ON DECEMBER RECORD...TOPPING THE OLD MARK OF 20 SET BACK IN 1889. THE LAST TWO MONTHS OF THE YEAR...AVERAGED TOGETHER...MADE FOR THE WARMEST END TO A CALENDAR YEAR ON RECORD. PRECIPITATION FOR DECEMBER WAS A TENTH OF AN INCH ABOVE THE NORMAL OF 2.63 INCHES. A STORM SYSTEM BROUGHT NEARLY A HALF AN INCH OF PRECIPITATION TO START THE MONTH. THE LAST WEEK FINISHED WET AS SEVERAL STORM SYSTEMS PASSED THROUGH THE REGION. THE GREATEST DAILY PRECIPITATION TOTAL OCCURRED ON THE 28TH WHEN 0.55 INCHES OF SNOW, SLEET AND RAIN WAS RECORDED. SNOWFALL CONTINUED TO REMAIN WELL BELOW NORMAL DEEP INTO DECEMBER. THE FIRST MEASURABLE SNOWFALL OF THE MONTH OCCURRED ON DECEMBER 28TH WHEN A WINTRY MIX OF SNOW AND SLEET PASSED OVER THE GENESEE VALLEY. IN ALL THIS STORM DROPPED 2.2 INCHES OF SNOW AND SLEET AT THE AIRPORT INTO THE EARLY HOURS OF TUESDAY THE 29TH. ADDITIONAL LIGHT SNOW FLEW ON THE LAST DAY OF THE MONTH...WITH ONE TENTH OF AN INCH MEASURED TO BRING THE MONTHLY TOTAL TO 2.3 INCHES. THIS IS THE LEAST SNOWIEST DECEMBER ON RECORD...BREAKING THE FORMER MARK OF 2.6 INCHES SET IN 1928. THE UPPER AIR PATTERN THIS MONTH PREDOMINATELY FEATURED A TROUGH OF LOW PRESSURE OVER THE WESTERN UNITED STATES...AND A RIDGE OF HIGH PRESSURE OVER THE EASTERN HALF OF THE UNITED STATES. A STRONG WEST TO EAST FLOW ACROSS THE COUNTRY LOCKED COLD AIR OVER CANADA AND ALLOWED MILD AIR TEMPERATURES TO EXPAND NORTHWARD FROM THE SOUTH. THIS BROUGHT MANY UNSEASONABLY WARM DAYS THIS MONTH. FOLLOWING A MILD LATE AUTUMN THE DURATION AND DEGREE OF WARMTH IN DECEMBER ALLOWED FOR A FEW SPRING FLOWERS TO APPEAR. STORM SYSTEMS PASSED BY THE REGION TO THE WEST AND EAST THIS MONTH...A COMMON TRACK THUS FAR THIS WINTER SEASON. WITHIN A WESTERLY FLOW THERE WAS ONE MODERATE LAKE EFFECT SNOW EVENT...WITH LIGHT SNOW EXTENDING OFF LAKE ERIE ACROSS THE SOUTHERN GENESEE VALLEY. ON THE 28TH A POWERFUL STORM SYSTEM PASSED ACROSS THE CENTRAL GREAT LAKES REGION...AND SENT AN AREA OF PRECIPITATION OVER WESTERN NEW YORK...WHICH REMAINED BELOW FREEZING AT THE ONSET. THIS SYSTEM BROUGHT SEVERAL INCHES OF SNOW AND SLEET TO THE ROCHESTER REGION BEFORE WARMER AIR CHANGED THE PRECIPITATION OVER TO RAIN. WITH THE REGION STILL BELOW FREEZING THERE WAS A MINOR GLAZING OF ELEVATED SURFACES. IN ALL AN AMAZINGLY WARM MONTH...WITH MANY DAYS FEELING LIKE MID AUTUMN...OR MID SPRING. && THOMAS $$

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