Climatological Report (Monthly)
Issued by NWS Sterling, VA

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000
CXUS51 KLWX 011345
CLMIAD

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
845 AM EST SUN JAN 1 2017

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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2016...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1962 TO 2016

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            67   12/27        66       1
LOWEST              9   12/16        10      -1
AVG. MAXIMUM     46.9              46.0     0.9     57.7
AVG. MINIMUM     29.5              27.1     2.4     39.6
MEAN             38.2              36.6     1.6
DAYS MAX >= 90      0               0.0     0.0
DAYS MAX <= 32      1               2.6    -1.6
DAYS MIN <= 32     22              22.6    -0.6
DAYS MIN <= 0       0               0.1    -0.1

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         6.74   1969
 MINIMUM         0.32   2007
TOTALS           2.36              2.96   -0.60     3.76
DAILY AVG.       0.08              0.10   -0.02
DAYS >= .01         9               9.9    -0.9
DAYS >= .10         7               6.1     0.9
DAYS >= .50         1               2.3    -1.3
DAYS >= 1.00        1               0.4     0.6
GREATEST
 24 HR. TOTAL    1.38   11/30 TO 12/01

SNOWFALL (INCHES)
RECORDS
 TOTAL           24.2   1966
TOTALS              T               3.5    -3.5
SINCE 7/1           T               4.0    -4.0
SNOWDEPTH AVG.      0
DAYS >= TRACE       5               1.6     3.4
DAYS >= 1.0         0               1.0    -1.0
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL        T

DEGREE_DAYS
HEATING TOTAL     823               882     -59      503
 SINCE 7/1       1550              1798    -248     1253
COOLING TOTAL       0                 0       0        2
 SINCE 1/1       1559              1178     381     1326
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              8.2
HIGHEST WIND SPEED/DIRECTION    37/300    DATE  12/15
HIGHEST GUST SPEED/DIRECTION    50/300    DATE  12/15

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            5
NUMBER OF DAYS PC             18
NUMBER OF DAYS CLOUDY          8

AVERAGE RH (PERCENT)     61

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       3
LIGHT RAIN               12     FREEZING RAIN              0
LT FREEZING RAIN          1     HAIL                       0
HEAVY SNOW                0     SNOW                       1
LIGHT SNOW                2     SLEET                      1
FOG                      11     FOG W/VIS <= 1/4 MILE      0
HAZE                      1

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

&&

WASHINGTON DULLES INTERNATIONAL AIRPORT...

THE MONTHLY AVERAGE TEMPERATURE WAS SLIGHTLY ABOVE NORMAL. MONTHLY
PRECIPITATION WAS SLIGHTLY BELOW NORMAL. SNOWFALL WAS BELOW NORMAL.

LAST MONTH MARKED THE THIRD CONSECUTIVE DECEMBER WITHOUT MEASURABLE
SNOWFALL. THIS IS THE ONLY TIME THREE DECEMBERS IN A ROW HAVE NOT
HAD MEASURABLE SNOWFALL IN THE DULLES VA AREA SINCE SNOWFALL RECORDS
BEGAN IN 1962.

LAST MONTH WAS ALSO THE SIXTH STRAIGHT DECEMBER TO RANK WARMER THAN
NORMAL. HOWEVER...IT WAS THE FIRST SINCE 2011 TO NOT HAVE AT LEAST
ONE DAY REACHING 70 DEGREES.

A RECORD DAILY MAXIMUM RAINFALL OF 1.03 INCHES WAS SET ON THE
6TH...BREAKING THE OLD RECORD OF 0.97 SET IN 2013.

A RECORD DAILY LOW TEMPERATURE OF 9 DEGREES WAS SET ON THE
16TH...BREAKING THE OLD RECORD OF 10 SET IN 1989.

CLIMATE RECORDS AT WASHINGTON DULLES INTERNATIONAL AIRPORT BEGAN IN
NOVEMBER OF 1962.

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

$$

DH/WOODY!



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