Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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CXUS51 KBUF 021514
CLMROC

CLIMATE REPORT
NATIONAL WEATHER SERVICE BUFFALO NY
338 PM EDT WED JUN 1 2016

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

...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF MAY 2016...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2016

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            91   05/28                         92  05/09
LOWEST             35   05/10                         32  05/23
AVG. MAXIMUM     69.6              67.6     2.0     75.6
AVG. MINIMUM     47.4              46.3     1.1     52.3
MEAN             58.5              57.0     1.5     64.0
DAYS MAX >= 90      1               0.2     0.8        2
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.6    -0.6        1
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         6.87   1894
 MINIMUM         0.24   2007
TOTALS           2.93              2.87    0.06     3.41
DAYS >= .01        11                                 12
DAYS >= .10         4                                  8
DAYS >= .50         1                                  2
DAYS >= 1.00        1                                  1
GREATEST
 24 HR. TOTAL    1.48   05/29 TO 05/29           05/30 TO 05/31
                        05/28 TO 05/29                    05/31 TO 05/31
                        05/29 TO 05/29                    05/31 TO 05/31

SNOWFALL (INCHES)
RECORDS
 TOTAL           10.9   1989
TOTALS              T               0.4    -0.4      0.0
SINCE 7/1        63.7              99.5   -35.8    101.9
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        T   05/15 TO 05/15           05/31 TO 05/31
                                                          05/31 TO 05/31
                                                          05/31 TO 05/31

DEGREE_DAYS
HEATING TOTAL     255               275     -20      128
 SINCE 7/1       5608              6578    -970     6814
COOLING TOTAL      62                26      36      103
 SINCE 1/1         62                30      32      103
..................................................

WIND (MPH)
AVERAGE WIND SPEED              7.8
HIGHEST WIND SPEED/DIRECTION    32/250
HIGHEST GUST SPEED/DIRECTION    41/270    DATE  05/14

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            4
NUMBER OF DAYS PC             17
NUMBER OF DAYS CLOUDY         10

AVERAGE RH (PERCENT)     64

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              1     MIXED PRECIP               0
HEAVY RAIN                3     RAIN                       4
LIGHT RAIN               16     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       1
LIGHT SNOW                0     SLEET                      1
FOG                       9     FOG W/VIS <= 1/4 MILE      2
HAZE                      0

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

&&

...CONTINUATION OF DRY WEATHER INTO MAY...

FREQUENT COOL PERIODS THE FIRST THREE WEEKS OF MAY YIELDED TO
ABUNDANT SUNSHINE THE LAST 10 DAYS OF THE MONTH. SUMMER`S WARMTH AND
HUMIDITY ALSO INCREASED THE FINAL 10 DAYS OF THE MONTH.
PRECIPITATION FOR THE MONTH WAS NEAR NORMAL.

THE TEMPERATURE AVERAGED 58.5F DEGREES THIS MONTH WHICH IS 1.5
DEGREES ABOVE NORMAL. THERE WERE 14 DAYS THAT AVERAGED BELOW NORMAL
THIS MONTH...WITH ALL DAYS FALLING WITHIN THE FIRST THREE WEEKS OF
MAY. ROCHESTER REACHED ITS FIRST 80F DEGREE READING ON MAY 12TH
WHICH IS ABOUT 2 WEEKS AFTER NORMAL. THE FIRST 90F READING OCCURRED
THIS MONTH AS WELL...WHEN ON SATURDAY MAY 28TH THE THERMOMETER ROSE
TO 91F. THIS IS ABOUT 3 WEEKS BEFORE NORMAL. THERE WERE NO NEW
TEMPERATURE RECORDS ESTABLISHED THIS MONTH.

PRECIPITATION FINISHED ABOVE NORMAL IN MAY...THOUGH THIS MAY BE A
BIT DECEPTIVE OF THE MONTH AS A WHOLE. HALF OF THIS TOTAL OCCURRED
DURING A DRENCHING DOWNPOUR ON SUNDAY MAY 29TH...WHEN 1.48 INCHES OF
RAIN OCCURRED. THROUGH A GOOD PORTION OF THE MONTH PRECIPITATION WAS
AVERAGING BELOW NORMAL...THIS A CARRY OVER FROM APRIL WHICH WAS ALSO
A DRY MONTH. ON SUNDAY THE 15TH UNDER AN UPPER LEVEL LOW LIGHT SNOW
MIXED IN WITH THE RAIN...ENOUGH SNOW THAT A LIGHT DUSTING COVERED
THE GROUND. THIS WAS THE FIRST SNOW IN MAY SINCE 2013.

THE OVERALL PATTERN THIS MONTH FEATURED A DEEP TROUGH ACROSS THE
EAST COAST...AND RIDGE OF HIGH PRESSURE OVER THE WEST COAST.
ANOMALOUS POSITIVE HEIGHTS IN THE MID LEVELS OVER GREENLAND FORCED
ANY AREAS OF LOW PRESSURE OVER THE EAST TO STALL...WHICH LINGERED
COOL DAYS...THAT WERE AT TIMES DAMP THE FIRST HALF OF MAY. THE FIRST
AREA OF LOW PRESSURE SPIRALED OVER THE NORTHEAST THE FIRST FEW DAYS
OF MAY...BRINGING LIGHT RAIN ACROSS WESTERN NEW YORK. A SECOND LOW
FORMED THE SECOND WEEK IN MAY...THIS CLOSER TO THE SOUTHERN MID
ATLANTIC REGION. THIS FEATURE STILL PRODUCED LIGHT RAIN SHOWERS ON A
FEW DAYS OF THE SECOND WEEK OF MAY...WHILE ALSO CONTINUING THE BELOW
NORMAL TEMPERATURE TREND. ON THE 14TH A COLD FRONT SWEPT ACROSS THE
REGION WITH A FEW RAIN SHOWERS. A MUCH COLDER AIRMASS BEHIND THE
FRONT DROPPED ACROSS THE EASTERN GREAT LAKES REGION ON THE
15TH...PRODUCING A FEW SHOWERS OF BOTH RAIN AND SNOW. THIS COOL
AIRMASS AND ASSOCIATED TROUGH OF LOW PRESSURE ALOFT SLOWLY EXITED
THE REGION THROUGH THE THIRD WEEK IN MAY. FOLLOWING THIS...WARMTH
THAT HAD BEEN BUILDING OVER THE WEST BEGAN TO SHIFT EASTWARD. ABOVE
NORMAL WARMTH FINALLY REACHED THE EASTERN GREAT LAKES REGION BY THE
END OF THE THIRD WEEK OF MAY. THIS WARMTH CONTINUED TO BUILD UNTIL
SATURDAY THE 28TH. SEVERAL HEAVY SHOWERS AND THUNDERSTORMS FORMED ON
BOTH THE 28TH AND 29TH. ON SUNDAY THE 29TH A HEAVY DELUGE FROM A
THUNDERSTORM PRODUCED NEAR AN INCH AND A HALF OF RAINFALL ACROSS THE
ROCHESTER AREA.

IN ALL...AFTER A COOL START TO MAY...SUMMERS WARMTH REACHED THE
REGION IN TIME FOR THE MEMORIAL DAY HOLIDAY WEEKEND.

SPRING STATS...

THE METEOROLOGICAL MONTHS OF MARCH-APRIL-MAY STARTED MILD AND
RELATIVELY SNOW FREE. BY EARLY APRIL HOWEVER A RETURN TO LATE
WINTER`S CHILL OCCURRED...THIS ALSO ACCOMPANIED BY A FEW INSTANCES
OF SNOW. THE APRIL SNOW WAS MORE THAN THE TYPICAL SNOWY MONTHS OF
NOVEMBER...DECEMBER AND MARCH...AND WAS THE GREATEST APRIL SNOW
SINCE 1995. AFTER A COOL START TO MAY MUCH WARMER TEMPERATURES WERE
RECORDED OVER THE FINAL HALF OF THE MONTH.

PRECIPITATION WHICH STARTED AROUND NORMAL THROUGH MARCH WAS LACKING
FOR MUCH OF THE FINAL TWO MONTHS OF SPRING. THIS LED TO THE GROUND
BECOMING DRY...AS SPRING`S VEGETATION QUICKLY USED WHAT WATER WAS
STORED FROM EARLY SPRING.

TEMPERATURE............47.0F (+1.1)
PRECIPITATION..........6.31" (-1.79)
SNOW...................12.0" (-8.6)

&&

THOMAS

$$


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