Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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000 CXUS51 KBUF 041400 CLMROC CLIMATE REPORT NATIONAL WEATHER SERVICE BUFFALO NY 935 AM EST SUN MAR 1 2015 ................................... ...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF FEBRUARY 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 73 02/21/1997 LOW -22 02/09/1934 HIGHEST 34 02/04 50 02/19 LOWEST -11 02/21 -5 02/12 02/20 AVG. MAXIMUM 20.7 34.1 -13.4 28.4 AVG. MINIMUM 3.6 18.6 -15.0 14.1 MEAN 12.2 26.4 -14.2 21.2 DAYS MAX >= 90 0 0.0 0.0 0 DAYS MAX <= 32 27 12.4 14.6 21 DAYS MIN <= 32 28 25.2 2.8 26 DAYS MIN <= 0 11 0.8 10.2 3 PRECIPITATION (INCHES) RECORD MAXIMUM 6.04 1876 MINIMUM 0.35 1888 TOTALS 2.51 1.95 0.56 2.39 DAYS >= .01 22 17 DAYS >= .10 9 8 DAYS >= .50 0 2 DAYS >= 1.00 0 0 GREATEST 24 HR. TOTAL 0.56 02/01 TO 02/02 02/20 TO 02/21 02/21 TO 02/21 02/21 TO 02/21 SNOWFALL (INCHES) RECORDS TOTAL 64.8 1958 TOTALS 45.2 21.5 23.7 26.3 SINCE 7/1 88.6 78.9 9.7 83.1 SNOWDEPTH AVG. 15 4 11 4 DAYS >= 1.0 14 6.8 7.2 5 GREATEST SNOW DEPTH 21 02/15 9 02/06 02/13 24 HR TOTAL 6.5 02/09 TO 02/09 02/21 TO 02/21 02/21 TO 02/21 02/21 TO 02/21 DEGREE_DAYS HEATING TOTAL 1472 1082 390 1217 SINCE 7/1 5094 4786 308 5085 COOLING TOTAL 0 0 0 0 SINCE 1/1 0 0 0 0 .................................................. WIND (MPH) AVERAGE WIND SPEED 10.5 HIGHEST WIND SPEED/DIRECTION 29/250 HIGHEST GUST SPEED/DIRECTION 38/260 DATE 02/06 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.80 NUMBER OF DAYS FAIR 2 NUMBER OF DAYS PC 5 NUMBER OF DAYS CLOUDY 21 AVERAGE RH (PERCENT) 72 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 0 MIXED PRECIP 0 HEAVY RAIN 0 RAIN 0 LIGHT RAIN 1 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 0 HEAVY SNOW 2 SNOW 9 LIGHT SNOW 26 SLEET 0 FOG 20 FOG W/VIS <= 1/4 MILE 3 HAZE 11 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && ...COLDEST MONTH ON RECORD... THE COLDEST CALENDAR MONTH ON RECORD WAS ESTABLISHED THIS FEBRUARY 2015 AS A CONSTANT SIEGE OF VERY COLD AIRMASSES BROUGHT DAY AFTER DAY OF WELL BELOW NORMAL TEMPERATURES. ALL BUT TWO DAYS THIS MONTH FINISHED BELOW NORMAL...AND NINE OF THESE DAYS FINISHED 20F OR MORE DEGREES BELOW NORMAL. THIS FEBRUARY ALSO WAS THE FOURTH SNOWIEST FEBRUARY ON RECORD. THE MONTH BEGAN WITH A SIGNIFICANT SNOWSTORM THAT DROPPED A FOOT TO A FOOT AND A HALF OF SNOW ACROSS WESTERN NEW YORK. AHEAD OF A CLIPPER LOW AIR TEMPERATURES REACHED 34F ON THE 4TH...THE ONLY SUCH ABOVE FREEZING TEMPERATURE THIS MONTH. THEREAFTER A STRONG RIDGE OF HIGH PRESSURE WAS ANCHORED OVER THE WESTERN THIRD OF NORTH AMERICAN...WHILE A DEEP TROUGH OF LOW PRESSURE WAS CARVED OVER THE EASTERN TWO THIRDS OF NORTH AMERICA. THIS PERSISTENT FLOW IN THE JET STREAM ALLOWED FOR ARCTIC AIR TO FLOW SOUTHWARD ACROSS CANADA AND TOWARDS THE GREAT LAKES REGION. THIS COLD AIRMASS WOULD THEN LINGER THROUGH THE END OF THE MONTH OVER EASTERN CANADA AND THE EASTERN UNITED STATES. THE EXTREMELY COLD AIR SET MANY DAILY LOW TEMPERATURE RECORDS THROUGH THE LAST THREE WEEKS OF THE MONTH. THE FINAL TWO WEEKS AVERAGED NEARLY 20 DEGREES BELOW NORMAL. THE COLDEST TEMPERATURE SET THIS MONTH WAS -11F DEGREES WHICH OCCURRED UNDER CLEARING SKIES AND COLD NORTHWEST FLOW. THIS READING HAPPENED BOTH JUST BEFORE AND AFTER MIDNIGHT OF THE 20TH AND 21ST. THIS IS ALSO THE LATEST IN THE WINTER SEASON THAT THE TEMPERATURE HAS DIPPED INTO THE NEGATIVE DOUBLE DIGITS IN ROCHESTER. WITHIN THE NORTHWEST FLOW THIS MONTH SEVERAL CLIPPER SYSTEMS PASSED THROUGH...WITH AIR TEMPERATURES MODERATING SLIGHTLY FROM THEIR FRIGID VALUES AND LIGHT SNOWS FALLING. BEHIND EACH CLIPPER LOW A FRESH ARCTIC AIRMASS REPLENISHED THE COLD AIR ACROSS THE GREAT LAKES REGION SENDING AIR TEMPERATURES AGAIN TO WELL BELOW NORMAL VALUES. THE AVERAGE TEMPERATURE THIS FEBRUARY WAS 12.2F DEGREES. THIS SET FEBRUARY AS NOT ONLY THE COLDEST OF ANY FEBRUARY MONTHS...BUT ALSO THE COLDEST OF ANY MONTH IN ROCHESTER`S HISTORY. THE PREVIOUS COLDEST MONTH WAS FEBRUARY 1934 WHICH WAS 12.6F DEGREES. THE MONTH FINISHED OVER 14 DEGREES BELOW NORMAL WHILE BREAKING MANY RECORD LOW TEMPERATURES THAT HAD STOOD FOR MORE THAN A CENTURY. THERE WERE FIVE RECORD LOWS SET THIS MONTH...ON THE 16TH (-7F), 20TH (-11F), 21ST (-11F), 23RD (-7F) AND 24TH (-9F). THERE WAS ALSO ONE RECORD LOW MAXIMUM SET THIS MONTH WHICH OCCURRED ON THE 20TH WITH A TEMPERATURE OF 6F DEGREES. THERE WAS JUST ONE DAY THAT REACHED ABOVE FREEZING THIS MONTH...FALLING SHORT OF FEBRUARY 1978 IN WHICH THE ENTIRETY OF THE DAYS REMAINED BELOW FREEZING. THERE WERE 10 DAYS THIS MONTH THAT FELL BELOW ZERO WHICH TIES WITH FEBRUARY 1979 FOR THE GREATEST NUMBER OF DAYS IN A MONTH FALLING BELOW ZERO. SNOWFALL THIS MONTH FINISHED AT 45.2 INCHES...WHICH IS ALMOST TWO FEET ABOVE NORMAL. THE 24 DAYS OF MEASURABLE SNOWFALL IS THE GREATEST NUMBER OF DAYS WITH MEASURABLE SNOWFALL IN THE MONTH OF FEBRUARY. THERE WERE TWO NOTABLE SNOWSTORMS THIS MONTH...THE FIRST EVENT OCCURRED ON THE 1ST AND 2ND TOTALING JUST UNDER 10 INCHES AT THE AIRPORT...BUT A SOLID FOOT OR MORE OF SNOW ACROSS THE METRO AREA. THE OTHER EVENT OCCURRED ON THE 8TH-9TH AS A STORM SYSTEM PASSING SOUTH OF NEW YORK STATE BROUGHT ANOTHER FOOT OF SNOW ACROSS THE GENESEE VALLEY. ALL SNOW THIS MONTH WAS SYNOPTICALLY DRIVEN. ALL MEASURABLE PRECIPITATION THAT FELL THIS MONTH WAS SNOW...AND THE LIQUID EQUIVALENT OF THE SNOW THIS MONTH WAS NEAR NORMAL. THERE WERE SEVERAL CASES OF FREEZING DRIZZLE THROUGHOUT THE MONTH. THE SNOW THAT FELL TOWARDS THE END OF JANUARY AND THROUGH FEBRUARY ACCUMULATED INTO A VERY DEEP SNOWPACK THAT REMAINED THROUGH THE MONTH OF FEBRUARY. THE TYPICAL MID WINTER THAWS NEVER OCCURRED THIS WINTER SEASON WHICH ALLOWED FOR THE SNOW DEPTH TO BE THE GREATEST IN 13 YEARS. THE SNOW DEPTH PEAKED AT 21 INCHES ON THE 15TH...GREATEST SNOW DEPTH SINCE MARCH OF 1999 WHICH HAD A SNOWPACK THAT PEAKED AT 34 INCHES. THERE WERE SEVERAL DAYS OF GUSTY WINDS THAT BROUGHT BLOWING AND DRIFTING OF SNOW. THESE WINDS ALSO CREATED DANGEROUS WIND CHILLS OVER THE LAST THREE WEEKS OF THE MONTH. IN ADDITION TO THE TYPICAL SHORELINE ICE...A LARGE PORTION OF THE LAKE ONTARIO WATERS WERE COVERED BY ICE THROUGH THE MONTH. IN ALL A HISTORIC COLD AND SNOWY FEBRUARY THAT WILL SERVE AS A NEW BENCHMARK FOR COLDNESS. HERE ARE THE WINTER (DJF) STATS FOR ROCHESTER. (NORMAL IN PARENTHESIS) TEMPERATURE...22.0F (27.0F) **TIED FOR 13TH COLDEST PRECIPITATION...6.56" (6.99") **47TH DRIEST && THOMAS $$

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