000
CXUS51 KLWX 011434
CLMIAD

TTAA00 KLWX 010920


CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1034 AM EDT WED OCT 1 2008

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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2008...

CLIMATE NORMAL PERIOD 1971 TO 2000
CLIMATE RECORD PERIOD 1962 TO 2008

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            93   09/04        91       2
LOWEST             46   09/21        39       7
AVG. MAXIMUM     79.4              78.9     0.5     83.8
AVG. MINIMUM     59.3              55.6     3.7     58.6
MEAN             69.4              67.3     2.1
DAYS MAX >= 90      4               2.9     1.1
DAYS MAX <= 32      0               0.0     0.0
DAYS MIN <= 32      0               0.1    -0.1
DAYS MIN <= 0       0               0.0     0.0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        11.26   1975
 MINIMUM         0.15   2005
TOTALS           7.18              3.82    3.36     1.40
DAILY AVG.       0.24              0.13    0.11
DAYS >= .01         9               9.1    -0.1
DAYS >= .10         6               5.7     0.3
DAYS >= .50         2               2.7    -0.7
DAYS >= 1.00        1               1.0     0.0
GREATEST
 24 HR. TOTAL    5.42   09/05 TO 09/06

DEGREE_DAYS
HEATING TOTAL      24                60     -36       28
 SINCE 7/1         24                65     -41       28
COOLING TOTAL     160               132      28      220
 SINCE 1/1       1154              1057      97     1485
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              5.8
HIGHEST WIND SPEED/DIRECTION    27/350    DATE  09/06
HIGHEST GUST SPEED/DIRECTION    40/350    DATE  09/06

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM

NUMBER OF DAYS FAIR            8
NUMBER OF DAYS PC              9
NUMBER OF DAYS CLOUDY         12

AVERAGE RH (PERCENT)     71

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              1     MIXED PRECIP               0
HEAVY RAIN                4     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                      17     FOG W/VIS <= 1/4 MILE      2
HAZE                      9

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

THE SEPTEMBER 2008 MONTHLY PRECIPITATION OF 7.18 INCHES MADE IT THE
8TH WETTEST SEPTEMBER ON RECORD. ON THE 6TH A NEW DAILY RECORD WAS
SET WHEN TROPICAL STORM HANNA DROPPED 5.11 INCHES OF RAIN BREAKING
THE OLD RECORD OF 3.62 INCHES SET IN 1996. THE DAILY RECORD RAINFALL
ON THE 6TH MADE IT THE 4TH HIGHEST DAILY RAINFALL TALLIED AT DULLES
SINCE RECORD KEEPING BEGAN THERE IN DECEMBER 1962.

SEPTEMBER 2008 WAS THE NINTH WARMEST ON RECORD DATING BACK TO 1963.

$$