Climatological Report (Monthly)
Issued by NWS Sterling, VA

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000
CXUS51 KLWX 021809
CLMIAD

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
208 PM EDT THU OCT 2 2014

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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2014...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1962 TO 2014

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            91   09/06        91       0
LOWEST             42   09/23        39       3
AVG. MAXIMUM     77.3              79.4    -2.1       MM
AVG. MINIMUM     57.6              56.3     1.3       MM
MEAN             67.5              67.9    -0.4
DAYS MAX >= 90      2               2.7    -0.7
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           0.93              3.92   -2.99       MM
DAILY AVG.       0.03              0.13   -0.10
DAYS >= .01         7               8.7    -1.7
DAYS >= .10         2               5.8    -3.8
DAYS >= .50         1               2.6    -1.6
DAYS >= 1.00        0               1.1    -1.1
GREATEST
 24 HR. TOTAL    0.64   09/24 TO 09/25

DEGREE_DAYS
HEATING TOTAL      45                56     -11       MM
 SINCE 7/1         48                58     -10       MM
COOLING TOTAL     126               141     -15       MM
 SINCE 1/1        959              1157    -198       MM
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              5.3
HIGHEST WIND SPEED/DIRECTION    25/320    DATE  09/22
HIGHEST GUST SPEED/DIRECTION    35/330    DATE  09/22

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            1
NUMBER OF DAYS PC             20
NUMBER OF DAYS CLOUDY          9

AVERAGE RH (PERCENT)     74

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              3     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       2
LIGHT RAIN                9     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      15     FOG W/VIS <= 1/4 MILE      2
HAZE                      1

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

&&

DULLES INTERNATIONAL AIRPORT...

THE MONTHLY AVERAGE TEMPERATURE AT DULLES INTERNATIONAL AIRPORT FOR
SEPTEMBER 2014 WAS NEAR NORMAL. PRECIPITATION WAS WELL BELOW
NORMAL.

THIS SEPTEMBER WAS THE 4TH DRIEST ON RECORD. THE THREE DRIER
SEPTEMBERS ON RECORD ARE 1978 WITH 0.78 INCHES...1967 WITH 0.62
INCHES...AND 2005 WITH 0.15 INCHES.

THE TWO 90 DEGF DAYS OBSERVED IN SEPTEMBER 2014 FELL SHORT OF THE
AVERAGE NUMBER OF THREE. THIS IS THE FIRST TIME SINCE 2011 THAT THE
NUMBER OF 90 DEGF DAYS IN THE MONTH OF SEPTEMBER HAS BEEN BELOW
NORMAL.

$$








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