Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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CXUS51 KBUF 051912
CLMROC

CLIMATE REPORT
NATIONAL WEATHER SERVICE BUFFALO NY
541 PM EDT TUE MAY 1 2018

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

...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF APRIL 2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2018

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              93   04/28/1990
                        04/30/1970
 LOW               11   04/04/1879
HIGHEST            71   04/23                         86  04/27
LOWEST             22   04/09                         30  04/02
AVG. MAXIMUM     49.4              56.0    -6.6     61.2
AVG. MINIMUM     32.3              36.6    -4.3     41.7
MEAN             40.8              46.3    -5.5     51.5
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.2    -0.2        0
DAYS MIN <= 32     19               9.5     9.5        2
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.81   2011
 MINIMUM         0.94   1884
TOTALS           3.50              2.73    0.77     4.95
DAYS >= .01        19                                 13
DAYS >= .10         8                                 10
DAYS >= .50         1                                  3
DAYS >= 1.00        1                                  2
GREATEST
 24 HR. TOTAL    1.34   04/16

SNOWFALL (INCHES)
RECORDS
 TOTAL           23.8   1901
TOTALS            5.2               3.9     1.3      2.5
SINCE 7/1       120.5              99.1    21.4    107.1
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         2               1.2     0.8        1
GREATEST
 SNOW DEPTH         1   04/06                          1  04/07
 24 HR TOTAL      1.6   04/05

DEGREE_DAYS
HEATING TOTAL     718               565     153      411
 SINCE 7/1       6126              6303    -177     5267
COOLING TOTAL       0                 4      -4       14
 SINCE 1/1          0                 4      -4       14
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              10.5
HIGHEST WIND SPEED/DIRECTION    52/260
HIGHEST GUST SPEED/DIRECTION    66/250    DATE  04/04

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.70
NUMBER OF DAYS FAIR            3
NUMBER OF DAYS PC              7
NUMBER OF DAYS CLOUDY         20

AVERAGE RH (PERCENT)     70

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               1
HEAVY RAIN                4     RAIN                       8
LIGHT RAIN               16     FREEZING RAIN              2
LT FREEZING RAIN          2     HAIL                       0
HEAVY SNOW                2     SNOW                       8
LIGHT SNOW               13     SLEET                      1
FOG                      20     FOG W/VIS <= 1/4 MILE      1
HAZE                      1

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

&&

...AN UNSEASONABLY COOL APRIL...

APRIL OVERALL WAS A COOL MONTH, ESPECIALLY THE FIRST THREE WEEKS.
PRECIPITATION, BOTH LIQUID AND SNOWFALL FOR THE MONTH WAS ABOVE
NORMAL. ACTIVE WEATHER DURING THE MONTH PRIMARILY FROM WIND AND ICE
CAUSED PROBLEMS THROUGHOUT WESTERN AND NORTH CENTRAL NEW YORK.

APRIL SAW A STRETCH WHERE ONLY FOUR OUT OF THE FIRST 22 DAYS TO
START THE MONTH HAD ABOVE NORMAL TEMPERATURES. DURING THIS STRETCH
THE AVERAGE TEMPERATURE WAS AS MUCH AS 13 DEGREES BELOW NORMAL, WITH
SEVERAL DAYS THAT WERE 10 DEGREES OR MORE BELOW NORMAL. ON APRIL 7TH
AND 8TH, THE TWO COLDEST DAYS OF THE MONTH, THE HIGH TEMPERATURE
ONLY REACHED 34 DEGREES. A WARMUP STARTED ON THE 22ND WHEN THE HIGH
TEMPERATURE REACHED 62 DEGREES, WHICH WAS THREE DEGREES WARMER THAN
THE NORMAL HIGH FOR THAT DATE. ANOTHER COUPLE DAYS OF WARMER THAN
NORMAL TEMPERATURES OCCURRED ON APRIL 23RD THROUGH 25TH. APRIL 23RD
WAS THE WARMEST DAY OF THE MONTH WITH A HIGH TEMPERATURE OF 71
DEGREES. ANOTHER COOL DOWN BROUGHT TEMPERATURES BACK BELOW NORMAL,
BUT NOT TO THE EXTENT THAT WAS EXPERIENCED EARLIER IN THE MONTH. THE
MONTH IN GENERAL HAD ONLY TEN DAYS WHERE THE TEMPERATURE WAS AT OR
ABOVE NORMAL. OVERALL THE MONTH FINISHED BELOW NORMAL WITH AN
AVERAGE TEMPERATURE OF 40.9 DEGREES. THIS IS 5.4 DEGREES BELOW THE
NORMAL OF 46.3 DEGREES. THE MONTH OF APRIL 2018 RANKED AS THE 10TH
COLDEST APRIL ON RECORD.

PRECIPITATION FOR THE MONTH WAS ABOVE NORMAL FOR BOTH SNOWFALL AND
LIQUID EQUIVALENT. APRIL 5TH SAW THE GREATEST SNOWFALL FOR ANY DAY
IN THE MONTH WHEN 1.6 INCHES ACCUMULATED FOR THE DAY AS A WEAK AREA
OF LOW PRESSURE AND ASSOCIATED FRONTS MOVED THROUGH THE AREA. A
COMPLEX STORM SYSTEM AFFECTED WESTERN AND NORTH CENTRAL NEW YORK ON
APRIL 14TH AND 15TH, WHEN MOST AREAS RECEIVED PERIODS OF SLEET AND
FREEZING RAIN. DURING THIS EVENT, THE ROCHESTER AIRPORT RECEIVED
1/8TH OF AN INCH OF ICE ACCUMULATION. MUCH MORE SIGNIFICANT ICE
ACCUMULATIONS OCCURRED IN THE NORTH COUNTRY WHERE AS MUCH AS ONE
INCH OF ICE ACCUMULATION OCCURRED WITH THIS EVENT. THIS STORM
CONTINUED TO AFFECT THE AREA THROUGH APRIL 16TH, WHEN 1.34 INCHES OF
LIQUID EQUIVALENT PRECIPITATION FELL FOR THE DAY. PRECIPITATION ON
APRIL 16TH SET A NEW DAILY PRECIPITATION RECORD, BREAKING THE OLD
RECORD OF 1.12 INCHES SET IN 1947. THE SECOND HALF OF THE MONTH WAS
FAIRLY QUIET WEATHER WISE WITH ONLY A FEW DAYS RECEIVING
PRECIPITATION GREATER THAN A TENTH OF AN INCH. PRECIPITATION FOR THE
MONTH WAS 3.50 INCHES, WHICH IS 0.77 INCHES ABOVE THE NORMAL OF 2.73
INCHES. SNOWFALL FOR THE MONTH WAS 5.2 INCHES, WHICH IS 1.3 INCHES
ABOVE THE NORMAL OF 3.9 INCHES.

A POWERFUL STORM SYSTEM MOVED THROUGH SOUTHERN ONTARIO CANADA LATE
ON THE NIGHT OF APRIL 3RD THROUGH THE DAY ON APRIL 4TH. WITH THIS
STORM PASSAGE, STRONG DAMAGING WINDS AFFECTED THE WESTERN AND NORTH
CENTRAL NEW YORK AREA. NUMEROUS TREES AND POWER LINES WERE KNOCKED
DOWN, STRUCTURAL DAMAGE TO SOME BUILDINGS OCCURRED AND A FEW TRACTOR
TRAILERS WERE BLOWN OVER. SOME WIND GUSTS OF NOTE WERE: 63 MPH AT
THE BUFFALO AIRPORT, 68 MPH AT FORT DRUM, 66 MPH AT THE ROCHESTER
AIRPORT AND 75 MPH IN BATAVIA.

THE LAKE ONTARIO WATER TEMPERATURE RANGED FROM 37 DEGREES FAHRENHEIT
TO AS WARM AS 42 DEGREES.

&&

WELCH

$$



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