Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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000
CXUS51 KBUF 060052
CLMROC

CLIMATE REPORT
NATIONAL WEATHER SERVICE BUFFALO NY
607 PM EDT MON JUN 1 2015

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

...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF MAY 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              94   05/30/1987
                        05/14/1974
 LOW               26   05/02/1979
                        05/07/1970
HIGHEST            92   05/09                         87  05/13
                                                          05/09
LOWEST             32   05/23                         39  05/05
AVG. MAXIMUM     75.6              67.6     8.0     69.7
AVG. MINIMUM     52.3              46.3     6.0     49.9
MEAN             64.0              57.0     7.0     59.8
DAYS MAX >= 90      2               0.2     1.8        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      1               0.6     0.4        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         6.87   1894
 MINIMUM         0.24   2007
TOTALS           3.41              2.87    0.54     3.17
DAYS >= .01        12                                 15
DAYS >= .10         8                                  7
DAYS >= .50         2                                  1
DAYS >= 1.00        1                                  1
GREATEST
 24 HR. TOTAL    1.64   05/30 TO 05/31

SNOWFALL (INCHES)
RECORDS
 TOTAL           10.9   1989
TOTALS            0.0               0.4    -0.4        T
SINCE 7/1       101.9              99.5     2.4    112.7
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   05/31 TO 05/31           05/31 TO 05/31

DEGREE_DAYS
HEATING TOTAL     128               275    -147      191
 SINCE 7/1       6814              6578     236     6986
COOLING TOTAL     103                26      77       38
 SINCE 1/1        103                30      73       39
..................................................

WIND (MPH)
AVERAGE WIND SPEED              8.8
HIGHEST WIND SPEED/DIRECTION    39/260    DATE  05/12
HIGHEST GUST SPEED/DIRECTION    51/250    DATE  05/12

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            5
NUMBER OF DAYS PC             16
NUMBER OF DAYS CLOUDY         10

AVERAGE RH (PERCENT)     61

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              7     MIXED PRECIP               0
HEAVY RAIN                4     RAIN                       4
LIGHT RAIN               13     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      14     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.
&&

...VERY WARM MAY...

MID SUMMERS WARMTH WAS FELT THROUGH THE GENESEE VALLEY IN MAY...WITH
MANY VERY WARM TO HOT DAYS ADDING UP TO THE WARMEST MONTH OF MAY ON
RECORD.

ABUNDANT SUNNY DAYS...A DRYING GROUND AND A MEAN SOUTHWESTERLY FLOW
LED TO THE WARMEST MAY ON RECORD. THE MEAN TEMPERATURES THIS MONTH
WAS 64.06F DEGREES WHICH IS 7.0F DEGREES ABOVE NORMAL. THERE WERE
TWO RECORD HIGH TEMPERATURES SET THIS MONTH...FALLING CONSECUTIVELY
ON THE 8TH AND 9TH WITH READINGS OF 90F AND 92F RESPECTIVELY. THERE
WAS ALSO A RECORD WARM MINIMUM TEMPERATURE SET ON THE 10TH WITH A
READING OF 67F DEGREES. THE TWO DAYS IN THE 90S ON THE 8TH AND 9TH
WERE THE 2ND EARLIEST CONSECUTIVE 90S IN RECORDED HISTORY.

PRECIPITATION THIS MONTH TOTALED 3.41 INCHES WHICH IS A HALF INCH
ABOVE NORMAL. THIS TOTAL IS A BIT DECEIVING OF THE MONTH AS A WHOLE
AS NEARLY HALF THIS TOTAL FELL WITHIN THE LAST 30 HOURS OF THE
MONTH. THERE WAS ONE PRECIPITATION RECORD ESTABLISHED...THE 1.64
INCHES OF RAIN THAT FELL ON THE LAST DAY OF THE MONTH TIED AN OLD
RECORD FOR THE DATE SET BACK IN 1889.

MANY OF MAY`S DAILY TEMPERATURES WERE ABOVE NORMAL WITH 24 DAYS
AVERAGING ABOVE NORMAL COMPARED TO 7 DAYS BELOW NORMAL. THESE WARM
TEMPERATURES IN CONJUNCTION WITH ALL THE SUNSHINE AND RAIN-FREE DAYS
MADE THIS MONTH A VERY PLEASANT MONTH. THERE WERE TWO NOTABLE
WEATHER FEATURES THIS MONTH. THE FIRST WAS A LATE FROST/FREEZE
ACROSS WESTERN NEW YORK ON THE MORNING OF THE 23RD. FOLLOWING A COOL
AND CLOUDY DAY IN THE LOW 60S...SKIES CLEARED WITH EXCELLENT
RADIATIONAL COOLING CONDITIONS. TEMPERATURES DROPPED TO 32F DEGREES
SATURDAY MORNING AT THE AIRPORT WITH WIDESPREAD FROST AND FREEZE
CONDITIONS ACROSS THE METROPOLITAN AREA OF ROCHESTER. THIS WAS THE
LATEST FREEZE AT THE AIRPORT SINCE MAY OF 1956...WHICH HAD FREEZING
TEMPERATURES ON BOTH THE 24TH AND 25TH.

VEGETATION SPRUNG FORTH IN THE WARM MONTH OF MAY...BUT PROLONGED DRY
STRETCHES AND SUNNY DAYS EVENTUALLY STARTED TO DRY THE LOW BRUSH AND
GRASSES. THIS DRY PATTERN ENDED ON THE LAST DAY OF THE MONTH WHEN A
MOISTURE LADEN SLOW MOVING COLD FRONT MOVED THROUGH THE REGION WITH
SIGNIFICANT RAINFALL. SEVERAL WAVES ALONG THIS COLD FRONT BROUGHT
NEARLY TWO INCHES OF RAINFALL TO THE GENESEE VALLEY THE LAST 30
HOURS OF THE MONTH...A RAINFALL EVENT THAT WAS WELCOMED EVEN THOUGH
THE RAIN FELL ON A WEEKEND. THIS EVENT PRODUCED NO SIGNIFICANT
FLOODING IN THE ROCHESTER AREA AS ANTECEDENT DRY CONDITIONS ALLOWED
THE GROUND TO ABSORB A PORTION OF THE RAIN THAT FELL...WITH
REMAINING RUNOFF CONTAINED WITHIN ALL CREEKS AND RIVERS.

IN ALL A PLEASANT SPRING MONTH FOR WESTERN NEW YORK.

SPRING STATS...

SPRING STARTED COOL...WITH AIR TEMPERATURES IN MARCH WELL BELOW
NORMAL. AFTER A NEAR NORMAL MONTH IN APRIL TEMPERATURE-WISE THE
MONTH OF MAY BROUGHT SUMMER LIKE WARMTH ACROSS WESTERN NEW YORK.
AFTER A SLOW START PRECIPITATION WISE TO SPRING...SEVERAL LATE
THUNDERSTORMS AND RAIN EVENTS BROUGHT SPRINGS FINAL PRECIPITATION
TOTAL TO WITHIN TWO THIRDS OF AN INCH OF NORMAL. HERE ARE SOME
SPRING STATS FOR METEOROLOGICAL SPRING WHICH IS DEFINED AS THE
MONTHS OF MARCH...APRIL AND MAY.

TEMPERATURE.......... 47.2F (+1.3)
PRECIPITATION........ 7.45" (-0.65")
SNOW.................13.3" (-7.3")

&&

THOMAS

$$



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