Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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000 CXUS51 KBUF 022235 RRA CLMROC CLIMATE REPORT NATIONAL WEATHER SERVICE BUFFALO NY 111 PM EST WED JAN 1 2020 ................................... ...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2019... CLIMATE NORMAL PERIOD 1981 TO 2010 CLIMATE RECORD PERIOD 1871 TO 2019 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 54 12/27 58 12/02 12/23 LOWEST 6 12/19 18 12/09 12/07 AVG. MAXIMUM 38.5 36.5 2.0 40.0 AVG. MINIMUM 24.4 23.5 0.9 27.7 MEAN 31.5 30.0 1.5 33.8 DAYS MAX >= 90 0 0.0 0.0 0 DAYS MAX <= 32 6 10.4 -4.4 4 DAYS MIN <= 32 26 24.9 1.1 25 DAYS MIN <= 0 0 0.4 -0.4 0 PRECIPITATION (INCHES) RECORD MAXIMUM 6.17 1878 MINIMUM 0.62 1958 TOTALS 3.90 2.63 1.27 2.60 DAYS >= .01 18 20 DAYS >= .10 9 9 DAYS >= .50 3 2 DAYS >= 1.00 0 0 GREATEST 24 HR. TOTAL 0.77 12/14 TO 12/14 SNOWFALL (INCHES) RECORDS TOTAL 46.5 2010 TOTALS 22.4 21.8 0.6 11.5 SINCE 7/1 40.2 29.2 11.0 29.0 SNOWDEPTH AVG. 2 3 -1 1 DAYS >= 1.0 11 6.3 4.7 5 GREATEST SNOW DEPTH 6 12/08 4 12/07 12/07 24 HR TOTAL 3.9 12/02 TO 12/02 1 DEGREE_DAYS HEATING TOTAL 1035 1085 -50 958 SINCE 7/1 2351 2453 -102 2345 COOLING TOTAL 0 0 0 0 SINCE 1/1 621 539 82 994 ................................................................. WIND (MPH) AVERAGE WIND SPEED 8.9 HIGHEST WIND SPEED/DIRECTION 31/300 HIGHEST GUST SPEED/DIRECTION 39/320 DATE 12/18 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.80 NUMBER OF DAYS FAIR 0 NUMBER OF DAYS PC 11 NUMBER OF DAYS CLOUDY 20 AVERAGE RH (PERCENT) 75 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 0 MIXED PRECIP 0 HEAVY RAIN 0 RAIN 4 LIGHT RAIN 10 FREEZING RAIN 1 LT FREEZING RAIN 1 HAIL 1 HEAVY SNOW 2 SNOW 8 LIGHT SNOW 15 SLEET 1 FOG 20 FOG W/VIS <= 1/4 MILE 4 HAZE 1 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && ...TYPICAL START TO DECEMBER ENDS ON A WARM NOTE... THE LAST MONTH OF THE YEAR STARTED IN TYPICAL FASHION, WITH COOL AIR FLOWING OVER THE REGION SPAWNING BANDS OF NUISANCE LAKE EFFECT SNOW. IT WAS NOT UNTIL DECEMBER 18TH THAT THE SEASON`S FIRST SIGNIFICANT LAKE EFFECT SNOWBAND FORMED OFF LAKE ERIE, AND THIS EVENT WAS ACROSS THE SOUTHERN TIER AND SKI COUNTRY REGION OF WESTERN NEW YORK. THE FINAL 10 DAYS OF THE YEAR FEATURED UNSEASONABLE MILDNESS AND BARE GROUND. THE TEMPERATURE AVERAGED 31.5F DEGREES AT THE ROCHESTER AIRPORT THIS DECEMBER, WHICH IS A DEGREE AND A HALF ABOVE NORMAL. THROUGH THE FIRST 3 WEEKS OF THE MONTH THERE WERE ONLY 5 DAYS REGISTERING ABOVE NORMAL TEMPERATURE DEPARTURES. THE FINAL 10 DAYS OF THE MONTH AVERAGED 12 DEGREES FAHRENHEIT ABOVE NORMAL...VERY UNUSUAL FOR THIS TIME OF YEAR. THIS MILD END TO THE MONTH RANKED 7TH WARMEST ON RECORD. THERE WERE 6 DAYS THAT ROSE TO 50F OR GREATER...3 DAYS MORE THAN NORMAL. DESPITE THE MILD END TO THE MONTH, THERE WERE NO DAILY RECORDS ESTABLISHED AND THE WARMEST DAY WAS THE 27TH WITH A HIGH TEMPERATURE OF 54F. PRECIPITATION TOTALED 3.90 INCHES FOR THE MONTH WHICH IS AROUND AN INCH AND A QUARTER ABOVE NORMAL. THERE WERE THREE DAYS WITH PRECIPITATION TOTALING JUST OVER 7 TENTHS OF AN INCH. OVERALL PRECIPITATION WAS EVENLY SPREAD THROUGH THE MONTH, WITH THE LONGEST DRY STRETCH OCCURRING FROM DECEMBER 21ST TO DECEMBER 26TH. SNOWFALL TOTALED 22.4 INCHES WHICH IS A FEW TENTHS ABOVE NORMAL. SNOW THIS MONTH WAS THE NICKLE AND DIME VARIETY WITH THE GREATEST DAILY SNOW BEING 3.9 INCHES ON THE 2ND. DECEMBER STARTED COOL AND WET WITH MEASURABLE PRECIPITATION ON THE FIRST 6 DAYS OF THE MONTH. THE HIGH TEMPERATURES THESE 6 DAYS WERE CONSISTENT...COMING IN AT EITHER 33F OR 34F. A WESTERLY FLOW DOMINATED THE FIRST HALF OF DECEMBER WITH EITHER LIGHT SYNOPTIC SNOW, OR THE OUTER FETCHES OF LAKE ERIE SNOWBANDS CROSSING THE AIRPORT. A SYNOPTIC SYSTEM PASSED TO THE EAST OF WESTERN NEW YORK ON THE 14TH AND 15TH OF THE MONTH. THIS SYSTEM PRODUCED JUST A FEW INCHES OF SNOW AFTER A RAIN EVENT, BUT ACROSS THE COLDER HIGHER TERRAIN SOUTH OF ROCHESTER JUST OVER A HALF A FOOT OF SNOW FELL. AFTER A BRIEF BREAK FROM THE PRECIPITATION LATER ON SUNDAY THE 15TH AND INTO MONDAY THE 16TH, ANOTHER SYNOPTIC SYSTEM BROUGHT SNOW INLAND ACROSS WESTERN NEW YORK AND THE FINGER LAKES LATE ON THE 16TH AND 17TH OF THE MONTH. THIS SYSTEM DREW MUCH COLDER AIR SOUTHWARD ACROSS THE EASTERN GREAT LAKES SUCH THAT THE FIRST SIGNIFICANT LAKE EFFECT SNOW EVENT OCCURRED ON THE 17TH AND 18TH OF THE MONTH. A BAND OF LAKE EFFECT SNOW PRODUCED JUST OVER A FOOT OF SNOW ACROSS THE SKI COUNTRY AND SOUTHERN TIER OF WNY. TYPICALLY THE FIRST SIGNIFICANT LAKE EFFECT EVENT OCCURS ON AVERAGE ABOUT A MONTH EARLIER. LAKE EFFECT SNOW ON THE 18TH AND 19TH TALLIED JUST A FEW INCHES ACROSS METRO ROCHESTER. THE FINAL 10 DAYS OF THE MONTH WERE UNUSUALLY QUIET AS A MILD AIRMASS LINGERED OVER WESTERN NEW YORK. THIS MELTED ANY REMAINING SNOW ON THE GROUND AND PRODUCED A BARE GROUND OVER CHRISTMAS AND THROUGH THE END OF THE YEAR. THERE WERE A FEW NIGHTS WITH DENSE FOG OVER THE REGION JUST PAST CHRISTMAS. A SNOW SQUALL CROSSED WESTERN NEW YORK MIDDAY ON THE 31ST, BRINGING JUST A FEW TENTHS OF AN INCH OF SNOW...BUT BRIEF GUSTY WINDS AND NEAR WHITE OUT CONDITIONS. LAKE ONTARIO FLUCTUATED BETWEEN 43F AT MONTHS START DOWN TO 38F TOWARDS THE END OF THE MONTH. SHORELINE ICE WAS HARD TO COME BY WITH ANY ICE THAT FORMED QUICKLY MELTING AWAY WITHIN A DAY OR TWO. THE HIGHEST WIND GUST OCCURRED ON THE 15TH AT 39 MPH. IN ALL A RELATIVELY TAME DECEMBER. && THOMAS $$

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