Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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CXUS51 KBUF 091555 CCA
CLMROC

CLIMATE REPORT
NATIONAL WEATHER SERVICE BUFFALO NY
142 PM EDT THU JUN 1 2017

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

...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF MAY 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              94   05/30/1987
                        05/14/1974
 LOW               26   05/02/1979
                        05/07/1970
HIGHEST            87   05/18                         91  05/28
LOWEST             37   05/10                         35  05/10
                        05/09
                        05/08
AVG. MAXIMUM     65.9              67.6    -1.7     69.6
AVG. MINIMUM     48.2              46.3     1.9     47.4
MEAN             57.0              57.0     0.0     58.5
DAYS MAX >= 90      0               0.2    -0.2        1
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.6    -0.6        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         6.87   1894
 MINIMUM         0.24   2007
TOTALS           5.29              2.87    2.42     2.93
DAYS >= .01        16                                 11
DAYS >= .10         8                                  4
DAYS >= .50         4                                  1
DAYS >= 1.00        2                                  1
GREATEST
 24 HR. TOTAL    1.59   05/25 TO 05/25

SNOWFALL (INCHES)
RECORDS
 TOTAL           10.9   1989
TOTALS            0.0               0.4    -0.4        T
SINCE 7/1       107.1              99.5     7.6     63.7
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         0               0.1    -0.1        0
GREATEST
 SNOW DEPTH         0   MM                             0  MM
 24 HR TOTAL      0.0

DEGREE_DAYS
HEATING TOTAL     265               275     -10      255
 SINCE 7/1       5532              6578   -1046     5608
COOLING TOTAL      28                26       2       62
 SINCE 1/1         42                30      12       62
..........................................................

WIND (MPH)
AVERAGE WIND SPEED              9.1
HIGHEST WIND SPEED/DIRECTION    36/260    DATE  05/02
HIGHEST GUST SPEED/DIRECTION    48/300    DATE  05/01

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.80
NUMBER OF DAYS FAIR            0
NUMBER OF DAYS PC             12
NUMBER OF DAYS CLOUDY         19

AVERAGE RH (PERCENT)     68

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              5     MIXED PRECIP               0
HEAVY RAIN                4     RAIN                       8
LIGHT RAIN               16     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       1
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      12     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.

&&

...WET MAY, AND SECOND WETTEST SPRING IN 134 YEARS FOR ROCHESTER NEW
YORK...

A WET SPRING CONTINUED THROUGH THE MONTH OF MAY AS SLOW MOVING STORM
SYSTEMS, AND HEAVY DOWNPOURS FROM THUNDERSTORMS CONTINUED TO
SATURATE WESTERN NEW YORK. COMBINED WITH MARCH AND APRIL, THE THREE
SPRING MONTHS FINISHED SECOND WETTEST ON RECORD, TRAILING ONLY THE
SPRING OF 1873.

THE AVERAGE AIR TEMPERATURE FOR MAY WAS 57.0F WHICH IS EXACTLY
NORMAL. MUCH OF THE FIRST HALF OF THE MONTH REMAINED BELOW NORMAL,
WITH THE COOLEST STRETCH THIS MONTH ON THE 8TH THROUGH 10TH WHEN THE
MERCURY DIPPED TO 37F EACH DAY. DAYS TRENDED ABOVE NORMAL FOR THE
END OF THE MONTH, INCLUDING 4 STRAIGHT DAYS IN THE 70S TO FINISH THE
MEMORIAL DAY WEEKEND AND MONTH. THERE WERE NO RECORDS OR EXTREMES
THIS MAY, AND THE WARMEST DAY THIS MONTH WAS 87F ON THE 18TH.

PRECIPITATION FOR THE MONTH FINISHED AT 5.29 INCHES, WHICH IS ALMOST
TWO AND A HALF INCHES ABOVE NORMAL. THERE WAS ONE NEW PRECIPITATION
RECORD, WITH THE 1.24 INCHES OF RAIN ON THE 1ST SETTING A NEW RECORD
FOR THE DATE. THERE WERE 5 DAYS WITH THUNDERSTORMS, WITH EACH EVENT
CONTRIBUTING TO THE 16TH WETTEST MAY ON RECORD. OVERALL THIS WET
MONTH PRODUCED 4 MORE DAYS THAN NORMAL WITH MEASURABLE
PRECIPITATION.

THE BEGINNING OF THE MONTH BEGAN ON THE STORMY SIDE, WITH NUMEROUS
SEVERE THUNDERSTORMS BRINGING LOCALIZED DAMAGING WIND GUSTS ACROSS
WESTERN NEW YORK. IN ADDITION HEAVY RAIN PASSED ACROSS THE REGION
WITH OVER AN INCH OF RAIN MEASURED AT THE ROCHESTER AIRPORT. AFTER A
FEW DAYS OF COOL WEATHER AND RESPITE FROM THE RAIN, ANOTHER STORM
SYSTEM CUT THROUGH THE OHIO VALLEY AND PRODUCED ADDITIONAL
WIDESPREAD SOAKING RAIN FROM THE 4TH THROUGH THE 6TH. COOL WEATHER
AND CLOUDY DAYS CONTINUED THROUGH MID-MONTH AS A DEEP UPPER LEVEL
LOW REMAINED STALLED OVER QUEBEC. THE SPRING OF 2017 WAS A STARK
CONTRAST TO THE PREVIOUS SPRING OF 2016 WHICH FEATURED THE ONSET OF
DROUGHT CONDITIONS. LAWNS THIS YEAR REMAINED LUSH AND FLOWERS
FLOURISHED UNDER THE COOL AND DAMP CONDITIONS.

THE FIRST TASTE OF SUMMER THIS MONTH OCCURRED ON THE 17TH AND 18TH
OF THE MONTH. WARM AIR FROM THE SOUTHWEST FLOWED OVER THE EASTERN
GREAT LAKES REGION AND BROUGHT WIDESPREAD 80S, AND A FEW 90F
READINGS. ANOTHER COOL POOL SETTLED OVER WESTERN NEW YORK LATER ON
THE 18TH. AS THESE AIRMASSES CLASHED, SEVERE THUNDERSTORMS AGAIN
FORMED, WITH SOME BEARING HAIL TO 2 INCHES IN DIAMETER ACROSS
SOUTHWESTERN NEW YORK AND 2.5 INCHES SOUTHEAST OF LAKE ONTARIO.
ANOTHER SLOW MOVING LOW FROM THE SOUTH PASSED NEAR THE REGION ON THE
25TH, BRINGING AN ALL-DAY RAIN EVENT THAT YIELDED AN INCH TO TWO
INCHES OF RAIN TO WESTERN NEW YORK. A WEAK COLD FRONT BROUGHT SOME
SHOWERS LATER SUNDAY AND INTO THE MORNING HOURS OF MEMORIAL DAY, THE
29TH. MUCH OF THE RAIN ENDED BY TIME FESTIVITIES BEGAN LATER ON IN
THE DAY MONDAY.

WINDS FOR THE MONTH FINISHED ABOVE NORMAL (+0.3 MPH), FINISHING WITH
AN AVERAGE SPEED OF 9.1 MPH. THE PEAK WIND GUSTS FOR THE MONTH
OCCURRED IN STORMS ON THE 1ST WITH 48 MPH REGISTERED.

IN ALL, AND WHAT HAS BEEN THE THEME THIS SPRING, A WET MONTH LACKING
ANY SIGNIFICANT, LENGTHY WARM SPELLS.

&&

THOMAS

$$



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