Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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000 CXUS51 KBUF 061624 CLMROC CLIMATE REPORT NATIONAL WEATHER SERVICE BUFFALO NY 755 AM EST SUN JAN 1 2017 ................................... ...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2016... CLIMATE NORMAL PERIOD 1981 TO 2010 CLIMATE RECORD PERIOD 1871 TO 2016 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 52 12/27 69 12/14 12/26 LOWEST 9 12/19 24 12/28 AVG. MAXIMUM 37.2 36.5 0.7 49.3 AVG. MINIMUM 25.5 23.5 2.0 35.1 MEAN 31.3 30.0 1.3 42.2 DAYS MAX >= 90 0 0.0 0.0 0 DAYS MAX <= 32 7 10.4 -3.4 0 DAYS MIN <= 32 27 24.9 2.1 10 DAYS MIN <= 0 0 0.4 -0.4 0 PRECIPITATION (INCHES) RECORD MAXIMUM 6.17 1878 MINIMUM 0.62 1958 TOTALS 2.91 2.63 0.28 2.73 DAYS >= .01 25 15 DAYS >= .10 8 9 DAYS >= .50 1 2 DAYS >= 1.00 0 0 GREATEST 24 HR. TOTAL 0.56 12/17 TO 12/18 12/28 TO 12/29 12/28 TO 12/28 12/28 TO 12/28 SNOWFALL (INCHES) RECORDS TOTAL 46.5 2010 TOTALS 29.3 21.8 7.5 2.3 SINCE 7/1 45.2 29.2 16.0 3.5 SNOWDEPTH AVG. 3 3 0 0 DAYS >= 1.0 8 6.3 1.7 1 GREATEST SNOW DEPTH 11 12/16 2 12/29 24 HR TOTAL 10.6 MM 12/28 TO 12/28 12/28 TO 12/28 12/28 TO 12/28 DEGREE_DAYS HEATING TOTAL 1035 1085 -50 699 SINCE 7/1 2013 2453 -440 1739 COOLING TOTAL 0 0 0 0 SINCE 1/1 978 539 439 698 ......................................................... WIND (MPH) AVERAGE WIND SPEED 11.4 HIGHEST WIND SPEED/DIRECTION 33/270 HIGHEST GUST SPEED/DIRECTION 44/270 DATE 12/15 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.80 NUMBER OF DAYS FAIR 0 NUMBER OF DAYS PC 9 NUMBER OF DAYS CLOUDY 22 AVERAGE RH (PERCENT) 73 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 0 MIXED PRECIP 0 HEAVY RAIN 0 RAIN 7 LIGHT RAIN 12 FREEZING RAIN 0 LT FREEZING RAIN 4 HAIL 0 HEAVY SNOW 1 SNOW 9 LIGHT SNOW 22 SLEET 0 FOG 24 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. && ...WINDY DECEMBER WITH SNOWS... A PERSISTENT NORTHWEST FLOW THIS MONTH BROUGHT FREQUENT WINDS ACROSS THE ROCHESTER METRO AREA, WHILE ALSO PRODUCING LAKE EFFECT SNOWS. THE BULK OF THE WINTRY WEATHER CAME MID-MONTH WHEN A DEEP...BUT NOT EXTREME ARCTIC AIRMASS DROPPED ACROSS THE REGION WITH WINTER`S CHILLS, AND PERSISTENT LAKE EFFECT SNOWS. THE AVERAGE TEMPERATURE THIS MONTH WAS 31.3F WHICH IS JUST OVER A DEGREE ABOVE NORMAL. THERE WERE 11 DAYS THAT AVERAGED BELOW NORMAL, CENTERED AROUND THE MIDDLE OF THE MONTH, WITH BOTH THE START AND END OF THE MONTH SIDING ABOVE NORMAL. THERE WERE NO NEW RECORDS ESTABLISHED THIS MONTH, AND THE WARMEST DAY WAS THE TWO DAYS AFTER CHRISTMAS, WHEN BOTH THE 26TH AND 27TH REACHED 52 DEGREES. PRECIPITATION FOR THE MONTH AVERAGED JUST ABOVE NORMAL, BOTH IN LIQUID AND IN THE SNOW DEPARTMENT. THE 2.91 INCHES OF PRECIPITATION WAS A FEW TENTHS OF AN INCH ABOVE NORMAL, WHILE THE SNOWFALL OF 29.3 INCHES WAS 7.5 INCHES ABOVE THE MONTHLY NORMAL. THIS 29.3 INCHES OF SNOW WAS THE GREATEST MONTHLY TOTAL FOR DECEMBER SINCE 46.5 INCHES FELL IN 2010. THE WETTEST DAY THIS MONTH WAS ON THE 15TH WHEN 0.53 INCHES OF LIQUID FROM A NEW DAILY RECORD OF 10.6 INCHES OF SNOW FELL. IN ALL THE PRECIPITATION THIS MONTH PRODUCED LITTLE HYDROLOGICAL IMPACT ON AREA STREAMS AND CREEKS. THE FIRST FEW HOURS OF THE MONTH REMAINED VERY MILD WITH DECEMBER STARTING IN THE UPPER 40S AND LOW 50S ACROSS WESTERN NEW YORK. A COLD FRONT SWEPT THROUGH THE REGION EARLY, WITH COOLER TEMPERATURES THE NEXT FEW DAYS AND LAKE EFFECT RAIN AND SNOW SHOWERS. IT WOULD NOT BE UNTIL A STRONGER COLD FRONT PASSED ON THE 8TH THAT HEAVY AND PROLONGED BANDS OF LAKE EFFECT SNOW FORMED EAST OF THE EASTERN GREAT LAKES. THE FIRST MAJOR LAKE EFFECT EVENT FOR THE MONTH BEGAN IN THE EARLY MORNING OF THE 8TH AS MUCH COLDER AIR DEEPENED OVER THE EASTERN GREAT LAKES. THIS EVENT PRIMARILY BLITZED SKI COUNTRY AND THE SOUTHERN TIER WITH HEAVY SNOW. UPWARDS OF THREE FEET OF SNOW FELL DURING THIS EVENT. A NORTHWEST FLOW ALSO BROUGHT SEVERAL INCHES OF SNOW ACROSS THE SOUTHERN SHORES OF LAKE ONTARIO AND INLAND ACROSS THE GENESEE VALLEY. AS THE EVENT DREW TO A CLOSE, THE BAND OF SNOW LIFTED NORTHWARD TOWARDS BUFFALO AND THOUGH IN A WEAKER STATE IT DID DROP 5 TO 6 INCHES OF SNOW ACROSS METRO BUFFALO AREA LATE ON THE 11TH AND THROUGH THE EARLY MORNING HOURS OF THE 12TH. MUCH OF THE SNOW ENDED BY THE MORNING RUSH HOUR OF MONDAY THE 12TH FOR BUFFALO. ON THE HEALS OF THE FIRST MAJOR EVENT THIS MONTH, A SECOND EVENT FORMED OVER WESTERN NEW YORK, THIS AS AN ARCTIC FRONT DROPPED TOWARDS THE REGION. INITIALLY A SOUTHWEST WIND AHEAD OF THE ARCTIC AIRMASS BROUGHT LAKE EFFECT SNOW ACROSS METRO BUFFALO AND TOWARDS THE ROCHESTER AREA ON THE AFTERNOON HOURS OF THE 14TH. AN ARCTIC FRONT SLOWLY DROPPED SOUTHWARD OVER LAKE ONTARIO DURING THE DAY AND EVENING HOURS OF THURSDAY THE 15TH. STRONG WINDS OFF LAKE ONTARIO COMBINED WITH HEAVY SNOW BROUGHT BLIZZARD LIKE CONDITIONS TO THE SOUTHEASTERN SHORELINE OF LAKE ONTARIO...WITH ROCHESTER RECEIVING A DAILY RECORD AMOUNT OF SNOW OF 10.6 INCHES. FRIDAY BANDS OF SNOW OFF BOTH LAKES LIFTED BACK NORTHWARD, WITH LAKE ERIE STILL GOING STRONG THROUGH FRIDAY AFTERNOON AND PRODUCING ANOTHER 6 INCHES OF SNOW ACROSS BUFFALO...INCLUDING A SNOWFALL RATE OF 3 INCHES PER HOUR. BETWEEN THESE TWO EVENTS, AND A LAKE EFFECT EVENT TO CLOSE OUT THE YEAR A MINOR...BUT IMPACTFUL FREEZING RAIN EVENT GLAZED MUCH OF WESTERN NEW YORK SATURDAY NIGHT THROUGH SUNDAY MORNING THE 18TH. THIS GLAZE BROUGHT NUMEROUS ACCIDENTS SATURDAY EVENING THROUGH SUNDAY MORNING. FINALLY AS THE YEAR CLOSED OUT, A THIRD LAKE EFFECT EVENT UNFOLDED ACROSS WESTERN NEW YORK. THIS EVENT OVER THE FINAL DAYS OF THE MONTH PRODUCED ONE TO TWO FEET OF SNOW ACROSS SOUTHWESTERN NEW YORK STATE, WHILE CLOSER TO THE METRO AREAS OF BUFFALO AND ROCHESTER JUST A FEW INCHES OF SNOW FELL. WINDS WERE GUSTY THROUGH MONTH AVERAGING 11.4 MPH WHICH IS 1.5 MPH ABOVE NORMAL. THIS IS THE GREATEST POSITIVE DEPARTURE FROM NORMAL MONTHLY WINDS SINCE FEBRUARY OF 2007. IN ALL A TYPICAL WINTER MONTH, WITH COLD WINDS AND LAKE EFFECT SNOWS. && THOMAS $$

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