Climatological Report (Monthly)
Issued by NWS Buffalo, NY

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CXUS51 KBUF 052200
CLMROC

CLIMATE REPORT
NATIONAL WEATHER SERVICE BUFFALO NY
1253 PM EDT SUN OCT 1 2017

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

...THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 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              99   09/03/1953
 LOW               28   09/28/1947
HIGHEST            91   09/27                         92  09/07
                        09/26
                        09/25
LOWEST             41   09/30                         42  09/25
AVG. MAXIMUM     76.5              71.6     4.9     77.8
AVG. MINIMUM     54.7              52.0     2.7     55.8
MEAN             65.6              61.8     3.8     66.8
DAYS MAX >= 90      4               0.3     3.7        3
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         6.30   1977
 MINIMUM         0.28   1960
TOTALS           1.28              3.38   -2.10     2.30
DAYS >= .01         9                                  8
DAYS >= .10         4                                  4
DAYS >= .50         0                                  2
DAYS >= 1.00        0                                  1
GREATEST
 24 HR. TOTAL    0.35   09/03 TO 09/03           09/17 TO 09/18
                                                          09/30 TO 09/30
                                                          09/30 TO 09/30

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   09/30 TO 09/30           09/30 TO 09/30
                                                          09/30 TO 09/30
                                                          09/30 TO 09/30

DEGREE_DAYS
HEATING TOTAL      92               147     -55       51
 SINCE 7/1        119               181     -62       51
COOLING TOTAL     117                50      67      112
 SINCE 1/1        633               534      99      963
.................................................

WIND (MPH)
AVERAGE WIND SPEED              5.9
HIGHEST WIND SPEED/DIRECTION    28/250
HIGHEST GUST SPEED/DIRECTION    35/250    DATE  09/04

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR            6
NUMBER OF DAYS PC             19
NUMBER OF DAYS CLOUDY          5

AVERAGE RH (PERCENT)     73

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              3     MIXED PRECIP               0
HEAVY RAIN                2     RAIN                       6
LIGHT RAIN               10     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      20     FOG W/VIS <= 1/4 MILE      4
HAZE                      1

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

&&

...TWO HALVES OF SEPTEMBER...

SEPTEMBER FEATURED A COOL AND WET START TO THE MONTH, FOLLOWED BY A
DRY AND EVENTUALLY HOT FINISH. A HEAT WAVE THE LAST WEEK OF THE
MONTH FEATURED THE LATEST CONSECUTIVE FOUR DAYS REACHING INTO THE 90S.

THE TEMPERATURE FOR THE MONTH AVERAGED 65.6F WHICH IS 3.8 DEGREES
ABOVE NORMAL. HOWEVER THE MONTH CAN BE BROKEN DOWN INTO TWO DISTINCT
WEATHER REGIMES...A COOL FIRST 11 DAYS, AND A VERY WARM REMAINING 19
DAYS OF THE MONTH. THE FIRST 11 DAYS AVERAGED 59.9F, WHILE THE LAST
19 DAYS AVERAGED ABOUT 10 DEGREES WARMER AT 69.3F. THERE WERE 3
RECORD HIGHS ESTABLISHED, 91F/24TH, 91F/26TH AND 91F/27TH. THE FOUR
DAYS REACHING 91F (24TH - 27TH) WERE THE LATEST FOUR CONSECUTIVE
DAYS REACHING INTO THE 90S AT ROCHESTER. THIS SEPTEMBER PAIRS WITH
FEBRUARY AS HAVING THREE RECORD HIGH TEMPERATURES IN A MONTH, GREATEST
THIS YEAR. THE 15 DAYS OF 80F OR GREATER TEMPERATURES IS TIED FOR
THIRD GREATEST FOR THE MONTH OF SEPTEMBER, AND THE 4 DAYS REACHING
90F IS THE GREATEST AMOUNT IN SEPTEMBER SINCE 2002, WHEN THERE WERE
5 DAYS.

PRECIPITATION TOTALED 1.28 INCHES THIS MONTH, WHICH IS WELL BELOW
NORMAL OF 3.38 INCHES. THIS SEPTEMBER JOINS ONLY AUGUST FOR THE YEAR
WITH BELOW NORMAL PRECIPITATION. THE BULK OF THIS PRECIPITATION
OCCURRED THE FIRST WEEK, INCLUDING THIS MONTHS GREATEST DAILY
RAINFALL TOTAL OF 0.35 INCHES ON THE 3RD IN REMNANTS FROM HURRICANE
HARVEY. THE STRETCH OF 20 CONSECUTIVE DAYS WITHOUT MEASURABLE
RAINFALL (9TH TO 28TH) WAS TIED FOR THE 5TH LONGEST, AND WAS LONGEST
STRETCH OF NON MEASURABLE PRECIPITATION SINCE MAY OF 1977.

HIGH PRESSURE STARTED THE MONTH WITH FAIR WEATHER ACROSS WESTERN NEW
YORK. THE REMNANTS OF HURRICANE HARVEY PASSED BY THE REGION ON THE
2ND AND 3RD WITH MINOR RAINFALL AMOUNTS. FOLLOWING ONE MILD
AFTERNOON ON THE 4TH, A LINE OF THUNDERSTORMS CROSSED THE REGION
THAT EVENING, WITH STRONG WINDS FELLING TREES ACROSS THE SOUTHERN
TIER AND TOWARDS THE FINGER LAKES REGION. COOLER AIR THEN SETTLED
INTO WESTERN NEW YORK FROM THE 5TH THROUGH THE 11TH. A DISTINCT
PATTERN CHANGE THEN OCCURRED MID-MONTH, WITH TEMPERATURES SOARING TO
79F ON THE 12TH. RAIN FROM HURRICANE IRMA REMAINED JUST SOUTH AND
EAST OF THE REGION ON THE 12TH AND 13TH, ALLOWING FOR A PROLONGED
STRETCH OF DRY WEATHER. THE DRY GROUND, COUPLED WITH HEAT BROUGHT
NORTHWARD FROM TROPICAL ACTIVITY BUILT A STRONG HIGH PRESSURE OVER
THE EASTERN US, SUCH THAT AIR TEMPERATURES REACHED 91F ON FOUR
CONSECUTIVE DAYS FROM THE 24TH TO 27TH. THIS HEAT AND DRY WEATHER
DELAYED THE TURNING OF FALL FOLIAGE WITH MANY TREES STILL GREEN TO
FINISH THE MONTH. THE FINAL TWO DAYS OF THE MONTH ENDED BELOW NORMAL
WITH RAIN BOTH DAYS.

STRONGEST WINDS THIS MONTH WERE 35 MPH ON AFTERNOON OF THE 4TH.
AVERAGE WIND SPEEDS WERE 1.5 MPH BELOW NORMAL, FINISHING AT 5.9 MPH.

IN ALL, A COOL START TO THE MONTH GIVING WAY TO LATE SUMMER`S HEAT.

&&

THOMAS

$$



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