Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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CXUS51 KBUF 051218
CLMROC

CLIMATE REPORT
NATIONAL WEATHER SERVICE BUFFALO NY
113 PM EDT TUE AUG 1 2017

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

...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF JULY 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             102   07/10/1936
                        07/09/1936
 LOW               42   07/09/1963
HIGHEST            87   07/19                         94  07/13
LOWEST             54   07/29                         53  07/20
                        07/09
                        07/05
AVG. MAXIMUM     80.5              81.0    -0.5     85.8
AVG. MINIMUM     61.7              60.7     1.0     63.7
MEAN             71.1              70.8     0.3     74.8
DAYS MAX >= 90      0               2.3    -2.3        9
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.0     0.0        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         9.70   1947
 MINIMUM         0.43   1933
TOTALS           4.29              3.33    0.96     1.22
DAYS >= .01        13                                  7
DAYS >= .10         9                                  6
DAYS >= .50         3                                  0
DAYS >= 1.00        0                                  0
GREATEST
 24 HR. TOTAL    0.94   07/12 TO 07/12

SNOWFALL (INCHES)
RECORDS
 TOTAL             MM   MM
TOTALS            0.0               0.0     0.0      0.0
SINCE 7/1         0.0               0.0     0.0      0.0
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         0               0.0     0.0        0
GREATEST
 SNOW DEPTH         0   MM                             0  MM
 24 HR TOTAL      0.0

DEGREE_DAYS
HEATING TOTAL       2                12     -10        0
 SINCE 7/1          2                12     -10        0
COOLING TOTAL     198               193       5      313
 SINCE 1/1        373               329      44      504
..................................................

WIND (MPH)
AVERAGE WIND SPEED              6.8
HIGHEST WIND SPEED/DIRECTION    24/260    DATE  07/02, 07/01
HIGHEST GUST SPEED/DIRECTION    35/260    DATE  07/01

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)     73

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              9     MIXED PRECIP               0
HEAVY RAIN                8     RAIN                       7
LIGHT RAIN               15     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      17     FOG W/VIS <= 1/4 MILE      1
HAZE                      0

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

&&

...FAIRLY TYPICAL JULY...

JULY FEATURED TYPICAL MID-SUMMER CONDITIONS WITH 24 DAYS THIS MONTH
WITHIN 4 DEGREES OF NORMAL TEMPERATURE. THERE WERE NO MAJOR EXTREMES
IN THE TEMPERATURES THOUGH SEVERAL DAYS THROUGH THE MONTH EXHIBITED
SUMMER`S HIGH HUMIDITY. THERE WERE TWO WEATHER EVENTS MID MONTH THAT
BROUGHT SIGNIFICANT WEATHER (FLASH FLOODING, TORNADOES) TO
WESTERN NEW YORK.

THE AVERAGE TEMPERATURES THIS MONTH WAS 71.1F WHICH IS THREE TENTHS
OF A DEGREE ABOVE NORMAL. THE WARMEST DAY THIS MONTH WAS 87F ON JULY
19TH. THERE WERE NO 90 DEGREE READINGS THIS MONTH FOR THE SECOND
TIME THIS DECADE, WITH 2014 THE OTHER YEAR WITHOUT A 90 DEGREE
READING IN JULY.

PRECIPITATION FOR THE MONTH TOTALED 4.29 INCHES, WHICH IS ABOUT AN
INCH ABOVE NORMAL. SEVERAL THUNDERSTORMS BROUGHT HEAVY RAIN ACROSS
THE GENESEE VALLEY, WITH AN EVENT ON THE 12TH FEATURING THE GREATEST
CALENDAR DAY RAINFALL EVENT THIS MONTH OF 0.94 INCHES. THERE WERE 9
THUNDERSTORMS THIS MONTH, THREE MORE THAN NORMAL.

THERE WERE TWO SIGNIFICANT EVENTS IN JULY FOR WESTERN NEW YORK. THE
FIRST ON THE 12TH-13TH WHEN A WARM FRONT LIFTED ACROSS WESTERN NEW
YORK. ON WEDNESDAY THE 12TH, SEVERAL INCHES OF RAIN FELL ACROSS
WESTERN NEW YORK, INCLUDING AREAS OF ONE TO TWO INCHES ACROSS THE
SOUTHERN TIER, AND JUST TO THE SOUTH OF ROCHESTER ACROSS GENESEE AND
SOUTHERN MONROE COUNTIES. THROUGH THE MORNING HOURS OF THE 13TH
ANOTHER WAVE A HEAVY RAIN FELL ALONG THE WARM FRONT BOUNDARY, ACROSS
BUFFALO AND THE NIAGARA FRONTIER. THOUGH THE HEAVIEST OF RAIN AND
MORE SIGNIFICANT FLOODING REMAINED JUST TO THE SOUTH AND WEST OF
ROCHESTER, THERE WERE ROAD CLOSURES ACROSS LIVINGSTON AND ONTARIO
COUNTIES.

THE SECOND EVENT WAS JUST A WEEK LATER, ON THE 20TH, AND WAS A
NORTHWEST FLOW EVENT IN WHICH A COMPLEX OF TORNADIC THUNDERSTORMS
DROPPED ACROSS THE NIAGARA FRONTIER. FARTHER TO THE EAST ACROSS THE
GENESEE VALLEY, THESE STORMS PRODUCED HEAVY RAIN WITH A HALF TO ONE
INCH OF RAIN FALLING ACROSS THE VALLEY. THESE THUNDERSTORMS,
INITIALLY BRINGING DAMAGING WINDS, INTERACTED WITH A FRONTAL
BOUNDARY DRAPED ACROSS THE REGION TO SPAWN FOUR TORNADOES.

THE FIRST TWO TORNADOES WERE IN SOUTHERN ERIE COUNTY AND WERE THE
FIRST TORNADOES IN ERIE COUNTY SINCE 2006. THE FIRST TORNADO CROSSED
HAMBURG, INCLUDING THE ERIE COUNTY FAIRGROUNDS, WHILE THE SECOND
TORNADO THIS DAY CROSSED HOLLAND. IN ADDITION TO DOWNING MANY TREES,
THE TORNADO THROUGH HAMBURG CAUSED DAMAGE TO THE FAIRGROUNDS WHILE
ALSO BLOWING OUT THE WINDOWS OF HUNDREDS OF CARS.

A THIRD AND FOURTH TORNADO DEVELOPED LATER ACROSS ALLEGANY COUNTY IN
THE TOWNS OF RUSHFORD AND ANGELICA. THESE TORNADOES UPROOTED TREES,
WITH THE FOURTH TORNADO ACROSS ANGELICA ALSO DESTROYING A BARN AND
SEVERAL SHEDS.

WINDS WERE LIGHT FOR THE MONTH, AVERAGING 6.8 MPH WHICH IS 0.6 MPH
BELOW NORMAL. LAKE ONTARIO CARRIED OUT ITS TYPICAL LAKE TEMPERATURE
FLUCTUATIONS THROUGH THE MONTH, PEAKING AT 72F ON THE 10TH AND 22ND.

IN ALL IT WAS PLEASANT THROUGH MUCH OF THE MONTH.

&&

THOMAS

$$



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