Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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000 CXUS51 KBUF 171433 CLMROC CLIMATE REPORT NATIONAL WEATHER SERVICE BUFFALO NY 625 AM EST WED JAN 1 2014 ................................... ...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2013... CLIMATE NORMAL PERIOD 1981 TO 2010 CLIMATE RECORD PERIOD 1871 TO 2013 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 62 12/05 70 12/04 LOWEST -4 12/17 16 12/29 AVG. MAXIMUM 35.6 36.5 -0.9 41.7 AVG. MINIMUM 21.5 23.5 -2.0 30.6 MEAN 28.5 30.0 -1.5 36.2 DAYS MAX >= 90 0 0.0 0.0 0 DAYS MAX <= 32 14 10.4 3.6 8 DAYS MIN <= 32 28 24.9 3.1 22 DAYS MIN <= 0 2 0.4 1.6 0 PRECIPITATION (INCHES) RECORD MAXIMUM 6.17 1878 MINIMUM 0.62 1958 TOTALS 2.99 2.63 0.36 3.57 DAYS >= .01 23 17 DAYS >= .10 8 11 DAYS >= .50 1 1 DAYS >= 1.00 0 0 GREATEST 24 HR. TOTAL 1.16 12/21 TO 12/22 SNOWFALL (INCHES) RECORDS TOTAL 46.5 2010 TOTALS 22.5 21.8 0.7 22.6 SINCE 7/1 36.0 29.2 6.8 23.4 SNOWDEPTH AVG. 2 3 -1 2 DAYS >= 1.0 7 6.3 0.7 6 GREATEST SNOW DEPTH 8 12/15 11 12/30 24 HR TOTAL 4.5 12/14 DEGREE_DAYS HEATING TOTAL 1125 1085 40 887 SINCE 7/1 2497 2453 44 2176 COOLING TOTAL 0 0 0 0 SINCE 1/1 660 539 121 802 ....................................................... WIND (MPH) AVERAGE WIND SPEED 8.9 HIGHEST WIND SPEED/DIRECTION 35/260 HIGHEST GUST SPEED/DIRECTION 46/270 DATE 12/31 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM NUMBER OF DAYS FAIR 0 NUMBER OF DAYS PC 6 NUMBER OF DAYS CLOUDY 25 AVERAGE RH (PERCENT) 75 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 0 MIXED PRECIP 1 HEAVY RAIN 0 RAIN 4 LIGHT RAIN 10 FREEZING RAIN 1 LT FREEZING RAIN 5 HAIL 0 HEAVY SNOW 1 SNOW 8 LIGHT SNOW 20 SLEET 2 FOG 24 FOG W/VIS <= 1/4 MILE 3 HAZE 15 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && ...ACTIVE WEATHER PATTERN WITH COLD AND SNOW THEN RAIN AND FLOODING... THERE WAS A VERY ACTIVE WEATHER PATTERN THIS MONTH OF DECEMBER. IT ALL STARTED WITH A BRIEF PERIOD OF WARM WEATHER THE FIRST WEEK OF DECEMBER...WITH TEMPERATURES BRIEFLY TOUCHING THE LOW 60`S ON DECEMBER 5TH. A COLD FRONT MOVED THROUGH THE REGION ON THE 6TH AND SUCCESSIVE ROUNDS OF COLDER AIR PLUNGED SOUTHWARD FROM CANADA INTO THE UNITED STATES INCLUDING ACROSS THE EASTERN GREAT LAKES REGION THROUGH THE MIDDLE TO LATTER HALF OF DECEMBER...WHICH IN TURN LED TO OVERALL COLDER THAN AVERAGE TEMPERATURES. THIS COLD WAS ALSO ACCOMPANIED BY SEVERAL SYNOPTIC AND LAKE EFFECT SNOW EVENTS. THE COLDER AIR SPILLING ACROSS THE REGION FROM DECEMBER 10TH THROUGH THE 11TH WOULD BE RESPONSIBLE FOR THE FIRST OF TWO NOTABLE LAKE EFFECT SNOW EVENTS OFF LAKE ERIE. THE FIRST EVENT DROPPED SEVERAL FEET OF SNOW SOUTH OF BUFFALO AND BATAVIA...WITH UP TO A HALF A FOOT OF SNOW ACROSS SOUTHWEST METRO ROCHESTER. A SECOND EVENT ON THE 12TH AND 13TH CAME ON THE HEELS OF OUR FIRST MAJOR LAKE EFFECT SNOW EVENT. HOWEVER THIS TIME SNOW WAS NOT AS GREAT...AND THE BAND WAS A LITTLE FARTHER NORTH SPREADING SEVERAL INCHES OF SNOW ACROSS THE METRO ROCHESTER AREA OFF LAKE ERIE. FOLLOWING THIS PERIOD OF COLD AND SNOWY WEATHER...A BRIEF WARM-UP OCCURRED ALONG WITH COPIOUS AMOUNTS OF PRECIPITATION. THE COMBINATION OF RAIN ON TOP OF THE RECENT SNOWFALL CAUSED AREA CREEKS AND RIVERS TO SPILL OVER THEIR BANKS...WHILE MANY OF THEIR TRIBUTARIES ALSO PRODUCED FIELD FLOODING...FLOODED BASEMENTS AND CLOSED ROADWAYS. HOWEVER...THE WARM AND WET WEATHER WAS SHORT LIVED AND ON THE 24TH OF DECEMBER A COLD FRONT WOULD BRING BUFFALO BACK INTO A WINTER WONDER LAND. DECEMBER`S AVERAGE TEMPERATURE WAS 28.5F DEGREES...WHICH WAS 1.5 DEGREES BELOW NORMAL AND WAS THE 2ND STRAIGHT MONTH OF BELOW AVERAGE TEMPERATURES. THERE WAS ONE RECORD LOW THIS MONTH...WHEN THE TEMPERATURE DROPPED TO -4F...BREAKING THE OLD RECORD OF -3 SET BACK IN 1919. DECEMBERS TWO DAYS OF ZERO OR LOWER MINIMUM TEMPERATURES WERE THE FIRST SUCH OCCURRENCE IN THE MONTH OF DECEMBER SINCE 2004. THERE WAS 2.99 INCHES OF PRECIPITATION THIS MONTH WHICH FELL ABOUT A THIRD OF AN INCH SHORT OF NORMAL. WHILE THERE WERE SEVERAL WET DAYS (21ST AND 22ND) THERE WERE NO RECORD PRECIPITATION EVENTS THIS MONTH. SNOW FOR THE MONTH OF DECEMBER CAME IN AT 22.5 INCHES...JUST A TAD BIT(0.7 INCHES)BELOW NORMAL. SEVERAL PERIODS OF WARMTH ALLOWED FOR EACH SNOWPACK TO MELT...THOUGH THERE WERE 19 DAYS WITH AT LEAST AN INCH OF SNOW ON THE GROUND WHICH IS 3 DAYS MORE THAN NORMAL. WIND SPEED THIS MONTH AVERAGED 8.9 MPH WHICH IS MORE THAN 2 MPH BELOW NORMAL. THE SUN DID NOT MAKE MUCH OF AN APPEARANCE THIS MONTH...WHICH IS TYPICAL IN DECEMBER...WITH ONLY 21 PERCENT OF POSSIBLE SUNSHINE WHICH IS 6 PERCENT BELOW NORMAL. THERE WERE 28 DAYS THIS MONTH MOSTLY TO COMPLETELY CLOUDY. OVERALL THE MONTH OF DECEMBER WILL BE REMEMBER FOR ITS IMPRESSIVE LAKE EFFECT SNOWS AND THE FLOODING OF AREA CREEKS AND RIVERS. && REYNOLDS $$

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