Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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CXUS51 KBUF 060110
CLMROC

CLIMATE REPORT
NATIONAL WEATHER SERVICE BUFFALO NY
822 AM EDT TUE MAY 2 2017

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

...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF APRIL 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              93   04/28/1990
                        04/30/1970
 LOW               11   04/04/1879
HIGHEST            86   04/27                         77  04/21
LOWEST             30   04/02                         14  04/05
AVG. MAXIMUM     61.2              56.0     5.2     52.6
AVG. MINIMUM     41.7              36.6     5.1     32.0
MEAN             51.5              46.3     5.2     42.3
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.2    -0.2        3
DAYS MIN <= 32      2               9.5    -7.5       16
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.81   2011
 MINIMUM         0.94   1884
TOTALS           4.95              2.73    2.22     1.56
DAYS >= .01        13                                 13
DAYS >= .10        10                                  7
DAYS >= .50         3                                  1
DAYS >= 1.00        2                                  0
GREATEST
 24 HR. TOTAL    1.47   04/06 TO 04/07

SNOWFALL (INCHES)
RECORDS
 TOTAL           23.8   1901
TOTALS            2.5               3.9    -1.4      8.8
SINCE 7/1       107.1              99.1     8.0     63.7
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         1               1.2    -0.2        2
GREATEST
 SNOW DEPTH         1   04/07                          5  04/04
 24 HR TOTAL      2.5   04/06 TO 04/07

DEGREE_DAYS
HEATING TOTAL     411               565    -154      674
 SINCE 7/1       5267              6303   -1036     5353
COOLING TOTAL      14                 4      10        0
 SINCE 1/1         14                 4      10        0
....................................................

WIND (MPH)
AVERAGE WIND SPEED              9.9
HIGHEST WIND SPEED/DIRECTION    38/260
HIGHEST GUST SPEED/DIRECTION    51/260    DATE  04/16

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.70
NUMBER OF DAYS FAIR            4
NUMBER OF DAYS PC             10
NUMBER OF DAYS CLOUDY         16

AVERAGE RH (PERCENT)     67

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              4     MIXED PRECIP               0
HEAVY RAIN                5     RAIN                       6
LIGHT RAIN               15     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       1
LIGHT SNOW                2     SLEET                      0
FOG                      14     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.

&&

...MILD, SOGGY APRIL...

ABOVE NORMAL TEMPERATURES RETURNED FOR APRIL, WHILE FEATURING A VERY
WET MONTH. DESPITE THE WET MONTH, AIR TEMPERATURES FINISHED AS 5TH
WARMEST FOR ANY APRIL MONTH. THE MARCH-APRIL PRECIPITATION OF 10.74
INCHES WAS THE SECOND WETTEST IN HISTORY, TRAILING ONLY MARCH-APRIL
OF 1991 WHICH TOTALED 11.80 INCHES OF PRECIPITATION.

THE AVERAGE TEMPERATURE FOR APRIL FINISHED AT 51.5F, WHICH IS THE
5TH WARMEST APRIL ON RECORD, AND 1.1 DEGREES FROM THE WARMEST APRIL
ON RECORD (52.6F/1878). THE WARMEST DAY THIS MONTH WAS THE 27TH WHEN
A RECORD TYING 86F READING WAS REACHED. THIS TIES WITH 1990 FOR THE
WARMEST 27TH ON RECORD. THIS 86F WAS ALSO TIED FOR THE 9TH WARMEST
APRIL DAY IN ROCHESTER`S RECORD KEEPING. THERE WERE 7 DAYS ABOVE 70F
THIS MONTH, THREE MORE THAN NORMAL.

PRECIPITATION FOR THE MONTH FINISHED AT 4.95 INCHES, WHICH IS THE
4TH WETTEST APRIL ON RECORD, AND MORE THAN TWO INCHES ABOVE NORMAL.
CONTRIBUTING TO THIS WET APRIL WERE THREE EXTREME PRECIPITATION
EVENTS. THE FIRST, A COMBINATION OF RAIN AND SNOW, WAS ON THE 6TH
AND 7TH WHERE OVER AN INCH AND A HALF OF PRECIPITATION FELL ACROSS
THE GENESEE VALLEY. THE SECOND, ON THE 20TH ALSO FEATURED OVER AN
INCH OF PRECIPITATION. A THIRD EVENT ON THE LAST DAY OF THE MONTH
FEATURED OVER AN INCH OF RAINFALL ACROSS THE NORTHERN HALF OF MONROE
COUNTY, WITH AROUND A HALF AN INCH FALLING NEAR THE AIRPORT. THIS
0.41 INCHES BY THE END OF THE 30TH PUSHED ROCHESTER INTO 4TH PLACE
FOR WETTEST APRIL ON RECORD. THERE WAS ONE SNOW EVENT ON THE 6TH AND
7TH WITH 2.5 INCHES OF SNOW FALLING. ALTHOUGH APRIL WAS A THE TOP
TEN WETTEST MONTH, THE 13 DAYS OF MEASURABLE PRECIPITATION WAS
EXACTLY NORMAL.

THE SYNOPTIC PATTERN AS A WHOLE THIS MONTH FEATURED A PROGRESSIVE
FLOW, WITH ANOMALOUS HIGH TEMPERATURES AND HEIGHTS ACROSS THE
NORTHEAST. WHILE THERE WAS ONE AMPLIFIED PERIOD THAT TAPPED INTO
MUCH COLDER AIR, WITH ACCUMULATING SNOW ON THE 6TH AND 7TH, MUCH OF
THE MONTH FEATURED STORM SYSTEMS TRACKING ACROSS THE OHIO VALLEY,
BRINGING PERIODS OF RAIN AND THUNDERSTORMS ACROSS WESTERN NEW YORK.
THERE WERE NO LONG DRY STRETCHES THIS MONTH, WITH JUST THREE DAYS
THE GREATEST STRETCH WITHOUT A TRACE OF PRECIPITATION. STORMS THAT
BROUGHT ABUNDANT PRECIPITATION TO WESTERN NEW YORK OCCURRED ON THE
3RD-4TH, 6TH-7TH, 19TH-20TH AND 30TH OF THE MONTH. THESE STORM
SYSTEM BROUGHT SOME RIVER AND CREEK FLOODING TO THE GENESEE VALLEY
ON THE 7TH AND 8TH, WHILE AFTER THE EVENT ON THE 19TH AND 20TH
SEVERAL CREEKS AND STREAMS THROUGHOUT ALL OF WESTERN NEW YORK WENT
INTO MINOR FLOOD STAGE. THE DRIEST WEEK THIS MONTH WAS THE WEEK
LEADING UP TO EASTERN SUNDAY THE 16TH, WITH GENERALLY LESS THAN A
QUARTER OF AN INCH OF PRECIPITATION FALLING ACROSS WESTERN NEW YORK.
THE 16TH ALSO HAD THE GREATEST WIND GUST, THIS OF 51 MPH DURING THE
EARLY AFTERNOON HOURS. THERE WERE FOUR THUNDERSTORMS THIS MONTH
WHICH IS DOUBLE THE NORM.

IN ALL ANOTHER VERY WET SPRING MONTH, BUT WITH MILD TEMPERATURES.

&&

THOMAS

$$



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