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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