Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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CXUS51 KBUF 060211 CCA
CLMROC

CLIMATE REPORT...CORRECTED
NATIONAL WEATHER SERVICE BUFFALO NY
856 AM EST TUE JAN 2 2018

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

...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2017

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   12/05                         52  12/27
                                                          12/26
LOWEST              1   12/31                          9  12/19
                        12/28
AVG. MAXIMUM     31.5              36.5    -5.0     37.2
AVG. MINIMUM     20.4              23.5    -3.1     25.5
MEAN             26.0              30.0    -4.0     31.3
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     17              10.4     6.6        7
DAYS MIN <= 32     28              24.9     3.1       27
DAYS MIN <= 0       0               0.4    -0.4        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         6.17   1878
 MINIMUM         0.62   1958
TOTALS           2.24              2.63   -0.39     2.91
DAYS >= .01        21                                 25
DAYS >= .10         7                                  8
DAYS >= .50         1                                  1
DAYS >= 1.00        0                                  0
GREATEST
 24 HR. TOTAL    0.63   12/22 TO 12/23           12/17 TO 12/18


SNOWFALL (INCHES)
RECORDS
 TOTAL           46.5   2010
TOTALS           34.7              21.8    12.9     29.3
SINCE 7/1        37.3              29.2     8.1     45.2
SNOWDEPTH AVG.      3                 3       0        3
DAYS >= 1.0        11               6.3     4.7        8
GREATEST
 SNOW DEPTH         9   12/31                         11  12/16
 24 HR TOTAL      7.8   12/30 TO 12/31           12/18 TO 12/18


DEGREE_DAYS
HEATING TOTAL    1202              1085     117     1035
 SINCE 7/1       2293              2453    -160     2013
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        655               539     116      978
.........................................................

WIND (MPH)
AVERAGE WIND SPEED              9.7
HIGHEST WIND SPEED/DIRECTION    38/270
HIGHEST GUST SPEED/DIRECTION    52/270    DATE  12/19

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.80
NUMBER OF DAYS FAIR            1
NUMBER OF DAYS PC              3
NUMBER OF DAYS CLOUDY         27

AVERAGE RH (PERCENT)     76

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN                4     FREEZING RAIN              1
LT FREEZING RAIN          2     HAIL                       0
HEAVY SNOW                0     SNOW                       3
LIGHT SNOW               24     SLEET                      0
FOG                      25     FOG W/VIS <= 1/4 MILE      1
HAZE                      3

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

&&

...AN ACTIVE DECEMBER WITH SNOW AND COLD...

DECEMBER FEATURED PLENTY OF IMPACTFUL WINTER WEATHER EVENTS FOR
WESTERN NEW YORK WITH ACTIVE LAKE EFFECT SNOWS AND MULTIPLE SURGE`S
OF ARCTIC AIRMASSES. AFTER A SLOW START TO THE WINTER SEASON,
WINTERS FURY RAPIDLY INCREASED WITH MANY LAKE EFFECT SNOW
EVENTS...WHICH LED TO AN ABOVE NORMAL SNOWFALL MONTH. TWO ARCTIC
SURGES BROUGHT THE TEMPERATURE FOR THE MONTH TO BELOW NORMAL.

THE TEMPERATURE AVERAGED 26.0F THIS MONTH WHICH IS FOUR DEGREES
BELOW NORMAL. IT WAS THE COLDEST DECEMBER SINCE THE YEAR 2000. THE
MONTH CAN BE BROKEN DOWN INTO FOUR DISTINCT PATTERNS. THE FIRST 6
DAYS AVERAGED ABOVE NORMAL...INCLUDING THREE DAYS IN THE LOWER 50S
ON THE 3RD THROUGH 5TH. THE FIRST ARCTIC SURGE OF THE MONTH THEN
LASTED THROUGH MID-MONTH, DROPPING OVERNIGHT TEMPERATURES BELOW
FREEZING EACH NIGHT. A BRIEF THAWING SPELL OCCURRED FROM THE 18TH
THROUGH THE 23RD...INCLUDING THREE DAYS IN THE LOWER 40S ON THE 18TH
THROUGH 20TH. THEREAFTER ARCTIC AIR POURED OVER THE GREAT LAKES
REGION, PROGRESSIVELY LOWERING DAYTIME HIGHS FROM THE LOWER 30S TO
NEAR 10F BY MONTH`S CLOSURE. THERE WERE 16 DAYS THAT REACHED THE
FREEZING MARK, 4 LESS THAN NORMAL, AND VIRTUALLY ALL DURING THE
FIRST HALF OF THE MONTH. THE HIGH TEMPERATURE OF 11F ON THE 28TH AND
31ST WAS THE COLDEST DECEMBER HIGH TEMPERATURE SINCE 2004.

PRECIPITATION TOTALED 2.24 INCHES FOR THE MONTH, WHICH IS ABOUT A
THIRD OF AN INCH BELOW NORMAL. MOST OF THE EVENTS WERE SNOW, WITH
JUST ONE RAIN EVENT ON THE 5TH-6TH, AND ONE FREEZING RAIN EVENT ON
THE 23RD. SNOW TOTALED ABOVE NORMAL FOR THE MONTH, WITH 34.7 INCHES
OF SNOW RECORDED. THIS IS THE GREATEST SNOW AMOUNT IN DECEMBER SINCE
DECEMBER OF 2010. THERE WERE 20 DAYS WITH MEASURABLE SNOW, AND 11
DAYS WITH AT LEAST AN INCH OF SNOW. ONLY THE DECEMBERS OF 1970 (16),
2000 (14) AND 1976 (12) HAD MORE DAYS WITH AT LEAST AN INCH OF
SNOWFALL. THOUGH THERE WERE NO SIGNIFICANT SNOW EVENTS AT THE
ROCHESTER AIRPORT, THERE WERE 6 LAKE EFFECT SNOW EVENTS OVER THE
COURSE OF A BUSY MONTH. MOST OF THESE EVENTS FOCUSED THE LAKE EFFECT
SNOW TO THE EAST AND SOUTHEAST OF LAKE ONTARIO. THE FREEZING RAIN
EVENT ON THE 22ND-23RD BROUGHT A GLAZE TO A TENTH OF AN INCH OF ICE TO
ELEVATED SURFACES. PERSISTENT SNOWS FROM THE 23RD TO 25TH LED TO A
WHITE CHRISTMAS WITH 6 INCHES OF SNOW ON THE GROUND.

WINDS AVERAGED NEAR NORMAL THIS MONTH, JUST 0.2 MPH BELOW THE
MONTHLY NORMAL OF 9.9 MPH. THE STRONGEST WIND GUST WAS 52 MPH ON THE
19TH.

IN ALL A WESTERN NEW YORK WINTER MONTH WITH COLD AND SNOW.

&&

THOMAS

$$


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