Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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CXUS51 KBUF 050423
CLMROC

CLIMATE REPORT
NATIONAL WEATHER SERVICE BUFFALO NY
622 AM EST FRI JAN 1 2016

...................................

...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 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              72   12/03/1982
 LOW              -16   12/20/1942
HIGHEST            69   12/14                         57  12/24
LOWEST             24   12/28                         16  12/31
AVG. MAXIMUM     49.3              36.5    12.8     39.9
AVG. MINIMUM     35.1              23.5    11.6     28.9
MEAN             42.2              30.0    12.2     34.4
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0              10.4   -10.4        6
DAYS MIN <= 32     10              24.9   -14.9       23
DAYS MIN <= 0       0               0.4    -0.4        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         6.17   1878
 MINIMUM         0.62   1958
TOTALS           2.73              2.63    0.10     2.31
DAYS >= .01        15                                 16
DAYS >= .10         9                                  7
DAYS >= .50         2                                  1
DAYS >= 1.00        0                                  0
GREATEST
 24 HR. TOTAL    0.68   12/28 TO 12/29

SNOWFALL (INCHES)
RECORDS
 TOTAL           46.5   2010
TOTALS            2.3              21.8   -19.5     16.6
SINCE 7/1         3.5              29.2   -25.7     25.7
SNOWDEPTH AVG.      0                 3      -3        1
DAYS >= 1.0         1               6.3    -5.3        4
GREATEST
 SNOW DEPTH         2   12/29                         11  12/11
 24 HR TOTAL      2.0   12/28

DEGREE_DAYS
HEATING TOTAL     699              1085    -386      940
 SINCE 7/1       1739              2453    -714     2220
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        698               539     159      542
.................................................

WIND (MPH)
AVERAGE WIND SPEED              8.6
HIGHEST WIND SPEED/DIRECTION    39/270
HIGHEST GUST SPEED/DIRECTION    51/240    DATE  12/24

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.80
NUMBER OF DAYS FAIR            0
NUMBER OF DAYS PC             10
NUMBER OF DAYS CLOUDY         21

AVERAGE RH (PERCENT)     73

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       6
LIGHT RAIN               17     FREEZING RAIN              1
LT FREEZING RAIN          2     HAIL                       0
HEAVY SNOW                0     SNOW                       2
LIGHT SNOW                5     SLEET                      2
FOG                      19     FOG W/VIS <= 1/4 MILE      2
HAZE                      1

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

&&

...REMARKABLE WARMTH...LACK OF SNOW THIS DECEMBER...

DECEMBER 2015 FEATURED WELL ABOVE NORMAL AIR TEMPERATURES THE ENTIRE
MONTH...WITH ALL DAYS FINISHING ABOVE NORMAL. UNPRECEDENTED WARMTH
WITHIN A STRONG EL NINO GLOBAL PATTERN BROUGHT DECEMBER ITS WARMEST
MEAN AIR TEMPERATURE ON RECORD...SMASHING THE PREVIOUS RECORD.

THE AVERAGE AIR TEMPERATURE THIS MONTH WAS 42.2F WHICH IS AMAZINGLY
12.2F DEGREES ABOVE NORMAL...AND ECLIPSED THE PREVIOUS WARMEST
DECEMBER BY 3.2F DEGREES. SEVERAL DAILY TEMPERATURE RECORDS WERE SET
THIS MONTH INCLUDING NEW RECORD HIGHS FOR THE 11TH, 14TH...23RD AND
24TH. THE 69 DEGREES ON THE 14TH WAS THE SIXTH WARMEST DECEMBER DAY
ON RECORD. THERE WERE 16 DAYS WITH HIGH TEMPERATURES ABOVE
50F...GREATEST NUMBER ON DECEMBER RECORD...AND ECLIPSED THE PRIOR
RECORD SET BACK IN 1982 BY 5 DAYS. THE AVERAGE NUMBER OF DAYS IN
DECEMBER ABOVE 50F IS 3 DAYS. THERE WERE 22 DAYS WITH THE AIR
TEMPERATURE REMAINING AT OR ABOVE FREEZING. THIS ALSO IS THE
GREATEST NUMBER OF DAYS ON DECEMBER RECORD...TOPPING THE OLD MARK OF
20 SET BACK IN 1889. THE LAST TWO MONTHS OF THE YEAR...AVERAGED
TOGETHER...MADE FOR THE WARMEST END TO A CALENDAR YEAR ON RECORD.

PRECIPITATION FOR DECEMBER WAS A TENTH OF AN INCH ABOVE THE NORMAL
OF 2.63 INCHES. A STORM SYSTEM BROUGHT NEARLY A HALF AN INCH OF
PRECIPITATION TO START THE MONTH. THE LAST WEEK FINISHED WET AS
SEVERAL STORM SYSTEMS PASSED THROUGH THE REGION. THE GREATEST DAILY
PRECIPITATION TOTAL OCCURRED ON THE 28TH WHEN 0.55 INCHES OF SNOW,
SLEET AND RAIN WAS RECORDED.

SNOWFALL CONTINUED TO REMAIN WELL BELOW NORMAL DEEP INTO DECEMBER.
THE FIRST MEASURABLE SNOWFALL OF THE MONTH OCCURRED ON DECEMBER 28TH
WHEN A WINTRY MIX OF SNOW AND SLEET PASSED OVER THE GENESEE VALLEY.
IN ALL THIS STORM DROPPED 2.2 INCHES OF SNOW AND SLEET AT THE
AIRPORT INTO THE EARLY HOURS OF TUESDAY THE 29TH. ADDITIONAL LIGHT
SNOW FLEW ON THE LAST DAY OF THE MONTH...WITH ONE TENTH OF AN INCH
MEASURED TO BRING THE MONTHLY TOTAL TO 2.3 INCHES. THIS IS THE LEAST
SNOWIEST DECEMBER ON RECORD...BREAKING THE FORMER MARK OF 2.6 INCHES
SET IN 1928.

THE UPPER AIR PATTERN THIS MONTH PREDOMINATELY FEATURED A TROUGH OF
LOW PRESSURE OVER THE WESTERN UNITED STATES...AND A RIDGE OF HIGH
PRESSURE OVER THE EASTERN HALF OF THE UNITED STATES. A STRONG WEST
TO EAST FLOW ACROSS THE COUNTRY LOCKED COLD AIR OVER CANADA AND
ALLOWED MILD AIR TEMPERATURES TO EXPAND NORTHWARD FROM THE SOUTH.
THIS BROUGHT MANY UNSEASONABLY WARM DAYS THIS MONTH. FOLLOWING A
MILD LATE AUTUMN THE DURATION AND DEGREE OF WARMTH IN DECEMBER
ALLOWED FOR A FEW SPRING FLOWERS TO APPEAR. STORM SYSTEMS PASSED BY
THE REGION TO THE WEST AND EAST THIS MONTH...A COMMON TRACK THUS FAR
THIS WINTER SEASON. WITHIN A WESTERLY FLOW THERE WAS ONE MODERATE
LAKE EFFECT SNOW EVENT...WITH LIGHT SNOW EXTENDING OFF LAKE ERIE
ACROSS THE SOUTHERN GENESEE VALLEY. ON THE 28TH A POWERFUL STORM
SYSTEM PASSED ACROSS THE CENTRAL GREAT LAKES REGION...AND SENT AN
AREA OF PRECIPITATION OVER WESTERN NEW YORK...WHICH REMAINED BELOW
FREEZING AT THE ONSET. THIS SYSTEM BROUGHT SEVERAL INCHES OF SNOW
AND SLEET TO THE ROCHESTER REGION BEFORE WARMER AIR CHANGED THE
PRECIPITATION OVER TO RAIN. WITH THE REGION STILL BELOW FREEZING
THERE WAS A MINOR GLAZING OF ELEVATED SURFACES.

IN ALL AN AMAZINGLY WARM MONTH...WITH MANY DAYS FEELING LIKE MID
AUTUMN...OR MID SPRING.

&&

THOMAS

$$


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