Climatological Report (Monthly)
Issued by NWS Sterling, VA

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CXUS51 KLWX 020226
CLMIAD

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1026 PM EDT TUE OCT 1 2019

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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2019...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1960 TO 2019

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
RECORD
 HIGH              99   09/11/1983
                        09/10/1983
                        09/02/1980
 LOW               30   09/24/1974
HIGHEST            95   09/12        91       4
LOWEST             45   09/20        39       6
AVG. MAXIMUM     84.3              79.4     4.9     79.4
AVG. MINIMUM     60.6              56.3     4.3     65.4
MEAN             72.4              67.9     4.5
DAYS MAX >= 90      7               2.7     4.3
DAYS MAX <= 32      0               0.0     0.0
DAYS MIN <= 32      0               0.0     0.0
DAYS MIN <= 0       0               0.0     0.0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        11.26   1975
 MINIMUM         0.15   2005
TOTALS           0.41              3.92   -3.51     7.36
DAILY AVG.       0.01              0.13   -0.12
DAYS >= .01         4               8.7    -4.7
DAYS >= .10         1               5.8    -4.8
DAYS >= .50         0               2.6    -2.6
DAYS >= 1.00        0               1.1    -1.1
GREATEST
 24 HR. TOTAL    0.32   09/02 TO 09/02

DEGREE_DAYS
HEATING TOTAL       5                56     -51       13
 SINCE 7/1          5                58     -53       13
COOLING TOTAL     238               141      97      241
 SINCE 1/1       1473              1157     316     1425
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              5.5
HIGHEST WIND SPEED/DIRECTION    32/290    DATE  09/11
HIGHEST GUST SPEED/DIRECTION    46/290    DATE  09/11

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            6
NUMBER OF DAYS PC             18
NUMBER OF DAYS CLOUDY          6

AVERAGE RH (PERCENT)     66

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

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

&&

WASHINGTON DULLES INTERNATIONAL AIRPORT...

THE AVERAGE TEMPERATURE IN SEPTEMBER 2019 WAS WELL ABOVE NORMAL. IN
FACT, IT RAKED AS THE THIRD WARMEST ON RECORD. IT WAS THE WARMEST
SEPTEMBER SINCE 2016, THE WARMEST ON RECORD, WHEN THE AVERAGE
TEMPERATURE WAS 73.1 DEGREES.

MONTHLY PRECIPITATION WAS ONLY 10 PERCENT OF NORMAL. IN FACT, IT
RANKED AS THE SECOND DRIEST ON RECORD. IT WAS THE DRIEST SEPTEMBER
SINCE 2005, THE DRIEST ON RECORD, WHEN ONLY 0.15 INCHES OF
PRECIPITATION FELL.

A RECORD HIGH TEMPERATURE OF 95 DEGREES WAS TIED ON SEPTEMBER 12TH.
THIS MATCHED THE RECORD PREVIOUSLY SET IN 1998.

A RECORD HIGH TEMPERATURE OF 94 DEGREES WAS SET ON SEPTEMBER 23RD.
THIS BROKE THE OLD RECORD OF 93 DEGREES SET IN 2010.

A RECORD WARM MINIMUM TEMPERATURE OF 68 DEGREES WAS ALSO TIED ON
SEPTEMBER 23RD. THIS MATCHED THE RECORD PREVIOUSLY SET IN 2005.

A RECORD HIGH TEMPERATURE OF 86 DEGREES WAS TIED ON SEPTEMBER 28TH.
THIS MATCHED THE RECORD PREVIOUSLY SET IN 1998.

A RECORD HIGH TEMPERATURE OF 89 DEGREES WAS SET ON SEPTEMBER 29TH.
THIS BROKE THE OLD RECORD OF 85 DEGREES SET IN 1986.

A RECORD WARM MINIMUM TEMPERATURE OF 68 DEGREES WAS TIED ON
SEPTEMBER 30TH. THIS MATCHED THE RECORD PREVIOUSLY SET IN 1986.

WEATHER RECORDS FOR THE DULLES VA AREA HAVE BEEN RECORDED AT WHAT IS
NOW WASHINGTON DULLES INTERNATIONAL AIRPORT SINCE 1960. THE OFFICIAL
RECORD CONSISTS SOLELY OF DATA RECORDED AT THE AIRPORT. TEMPERATURE
AND PRECIPITATION RECORDS BEGAN IN 1960. SNOWFALL RECORDS BEGAN IN
1962.

ALL CLIMATE DATA ARE CONSIDERED PRELIMINARY UNTIL REVIEWED BY THE
NATIONAL CENTERS FOR ENVIRONMENTAL INFORMATION (NCEI).

$$

RCM


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