Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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000 CXUS51 KBUF 042226 CLMROC CLIMATE REPORT NATIONAL WEATHER SERVICE BUFFALO NY 852 AM EST THU JAN 1 2015 ................................... ...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2014... CLIMATE NORMAL PERIOD 1981 TO 2010 CLIMATE RECORD PERIOD 1871 TO 2014 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 57 12/24 62 12/05 LOWEST 16 12/31 -4 12/17 AVG. MAXIMUM 39.9 36.5 3.4 35.6 AVG. MINIMUM 28.9 23.5 5.4 21.5 MEAN 34.4 30.0 4.4 28.5 DAYS MAX >= 90 0 0.0 0.0 0 DAYS MAX <= 32 6 10.4 -4.4 14 DAYS MIN <= 32 23 24.9 -1.9 28 DAYS MIN <= 0 0 0.4 -0.4 2 PRECIPITATION (INCHES) RECORD MAXIMUM 6.17 1878 MINIMUM 0.62 1958 TOTALS 2.31 2.63 -0.32 2.99 DAYS >= .01 16 23 DAYS >= .10 7 8 DAYS >= .50 1 1 DAYS >= 1.00 0 0 GREATEST 24 HR. TOTAL 0.79 12/10 SNOWFALL (INCHES) RECORDS TOTAL 46.5 2010 TOTALS 16.6 21.8 -5.2 22.5 SINCE 7/1 25.7 29.2 -3.5 36.0 SNOWDEPTH AVG. 1 3 -2 2 DAYS >= 1.0 4 6.3 -2.3 7 GREATEST SNOW DEPTH 11 12/11 8 12/15 24 HR TOTAL 8.7 12/10 DEGREE_DAYS HEATING TOTAL 940 1085 -145 1125 SINCE 7/1 2220 2453 -233 2497 COOLING TOTAL 0 0 0 0 SINCE 1/1 542 539 3 660 ..................................................... WIND (MPH) AVERAGE WIND SPEED 9.5 HIGHEST WIND SPEED/DIRECTION 41/250 HIGHEST GUST SPEED/DIRECTION 53/250 DATE 12/25 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.90 NUMBER OF DAYS FAIR 0 NUMBER OF DAYS PC 5 NUMBER OF DAYS CLOUDY 26 AVERAGE RH (PERCENT) 75 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 0 MIXED PRECIP 0 HEAVY RAIN 1 RAIN 4 LIGHT RAIN 17 FREEZING RAIN 0 LT FREEZING RAIN 2 HAIL 0 HEAVY SNOW 0 SNOW 6 LIGHT SNOW 13 SLEET 0 FOG 18 FOG W/VIS <= 1/4 MILE 0 HAZE 3 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && DECEMBER STARTED IN TYPICAL FASHION WITH EARLY WINTERS COLDNESS AND SOME SNOW. BY THE CLOSE OF THE SECOND WEEK...A PATTERN CHANGE BROUGHT WARM PACIFIC AIR ACROSS THE GREAT LAKES AND THIS FLOW KEPT THE REGION VIRTUALLY SNOW-FREE FOR THE REMAINDER OF THE MONTH. THE AVERAGE TEMPERATURE FOR THE MONTH OF DECEMBER WAS 34.4F DEGREES...WHICH IS ABOUT FOUR AND A HALF DEGREES ABOVE NORMAL. FOR THE FIRST TIME IN FOUR DECEMBERS WE DID NOT REACH ABOVE 60F...THOUGH THE 6 DAYS THAT DID REACH INTO THE 50S WAS THREE MORE THAN NORMAL. THE COLDEST TEMPERATURE THIS MONTH WAS 16F DEGREES WHICH OCCURRED ON THE LAST DAY OF DECEMBER....AND THIS WAS THE ONLY MINIMUM TEMPERATURE IN THE TEENS THIS MONTH. THERE HAVE ONLY BEEN TWO OTHER DECEMBERS (1923,1877) WITH ONE OR LESS DAYS WITH MINIMUM TEMPERATURES IN THE TEENS. THERE WAS ONE NEW TEMPERATURE RECORD...ON THE 24TH A RECORD WARM LOW WAS SET...WITH THE 47F DEGREES BREAKING THE OLD RECORD OF 46F SET BACK IN 1931. PRECIPITATION FOR THE MONTH WAS SLIGHTLY BELOW THE NORMAL OF 2.63 INCHES. RAINFALL ACCOUNTED FOR ABOUT HALF OF THE 2.31 INCHES OF PRECIPITATION THIS MONTH. SNOWFALL WAS BELOW NORMAL AS WELL FOR DECEMBER. ABOUT HALF OF THE SNOW FELL ON THE 9TH AND 10TH...WHEN A SYNOPTIC STORM SYSTEM BROUGHT WIDESPREAD SNOWFALL TO WESTERN NEW YORK. OTHERWISE THERE WERE JUST MINOR EVENTS OF SOUTHWEST WINDS BRINGING LAKE EFFECT SNOW OFF LAKE ERIE INLAND TO THE GENESEE VALLEY. A COLD FRONT CROSSED THE REGION EARLY ON THE 1ST SENDING MIDNIGHT MILD TEMPERATURES IN THE MID 50S DOWN TO THE LOWER 30S BY AFTERNOON. THROUGH THE FIRST TWO WEEKS A TROUGH OF LOW PRESSURE OVER THE EASTERN UNITED STATES ALLOWED FOR A COLD CANADIAN AIRMASS TO DROP SOUTHWARD ACROSS THE GREAT LAKES. HOWEVER CONDITIONS WERE NOT FAVORABLE FOR LAKE EFFECT SNOW. THERE WAS ONE MAJOR SYNOPTIC STORM SYSTEM...A CLOSED LOW THAT DROPPED A HALF TO ONE FOOT OF SNOW ACROSS WESTERN NEW YORK. A FEW LOCALIZED AREAS NEAR THE SHORELINE RECEIVED LAKE ENHANCED SNOW...WITH UPWARD TO A FOOT AND A HALF OF SNOW ACCUMULATING. BEHIND THIS SYNOPTIC SYSTEM FREEZING DRIZZLE FELL THROUGH THE DURATION OF THE WEEKEND...FROM THE 12TH THROUGH THE 14TH. FOR THE REMAINDER OF THE MONTH A ZONAL WEST TO EAST FLOW DOMINATED...WITH JUST BRIEF INTRUSIONS OF COLDER AIR. AFTER A RELATIVELY QUIET THIRD WEEK...A CONVECTIVE LINE OF SHOWERS AHEAD OF A COLD FRONT CROSSED THE REGION CHRISTMAS EVE...BRINGING DAMAGING WIND GUSTS ACROSS THE NIAGARA FRONTIER...BUT WEAKENING JUST ENOUGH TO CAUSE VERY LITTLE DAMAGE ACROSS THE GENESEE VALLEY. THE MONTH ENDED ON A COLD NOTE WITH LIGHT LAKE EFFECT SNOW FALLING THROUGHOUT THE REGION. THE LAKE ONTARIO WATER TEMPERATURES HELD STEADY IN THE LOWER 40S AND UPPER 30S THROUGH THE MONTH. THE PEAK WIND GUST THIS MONTH WAS 53 MPH WHICH OCCURRED ON THE 25TH. IN ALL A MILD DECEMBER WITH A LACK OF TYPICAL LAKE EFFECT SNOW. && THOMAS $$

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