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054
CXUS51 KLWX 071516
CLMIAD

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1016 AM EST WED JAN 7 2015

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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 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              79   12/06/1998
 LOW               -4   12/25/1989
HIGHEST            70   12/01        66       4
LOWEST             18   12/31        10       8
AVG. MAXIMUM     45.6              46.0    -0.4     48.0
AVG. MINIMUM     31.0              27.1     3.9     30.4
MEAN             38.3              36.6     1.7
DAYS MAX >= 90      0               0.0     0.0
DAYS MAX <= 32      0               2.6    -2.6
DAYS MIN <= 32     17              22.6    -5.6
DAYS MIN <= 0       0               0.1    -0.1

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         6.74   1969
 MINIMUM         0.32   2007
TOTALS           3.26              2.96    0.30     5.58
DAILY AVG.       0.11              0.10    0.01
DAYS >= .01        14               9.9     4.1
DAYS >= .10         6               6.1    -0.1
DAYS >= .50         3               2.3     0.7
DAYS >= 1.00        0               0.4    -0.4
GREATEST
 24 HR. TOTAL    0.80   12/23 TO 12/24

SNOWFALL (INCHES)
RECORDS
 TOTAL           24.2   1966
TOTALS              T               3.5    -3.5
SINCE 7/1         1.6               4.0    -2.4
SNOWDEPTH AVG.      0
DAYS >= TRACE       2               1.6     0.4
DAYS >= 1.0         0               1.0    -1.0
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL        T

DEGREE_DAYS
HEATING TOTAL     817               882     -65      793
 SINCE 7/1       1811              1798      13     1757
COOLING TOTAL       0                 0       0        2
 SINCE 1/1        968              1178    -210     1274
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              7.0
HIGHEST WIND SPEED/DIRECTION    31/290    DATE  12/11
HIGHEST GUST SPEED/DIRECTION    40/300    DATE  12/11

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.70
NUMBER OF DAYS FAIR            3
NUMBER OF DAYS PC             15
NUMBER OF DAYS CLOUDY         13

AVERAGE RH (PERCENT)     71

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       5
LIGHT RAIN               15     FREEZING RAIN              0
LT FREEZING RAIN          3     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      2
FOG                      15     FOG W/VIS <= 1/4 MILE      5
HAZE                      2

-  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 THIS
NOVEMBER 2014 WAS ABOVE NORMAL. PRECIPITATION WAS SLIGHTLY ABOVE
NORMAL.

LAST MONTH WAS COOLER THAN DECEMBER 2013 BY 2.4 DEGREES.

ONLY A TRACE OF SNOWFALL WAS OBSERVED THE ENTIRE MONTH...THE LOWEST
MONTHLY SNOWFALL SINCE 2011.

$$







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