Climatological Report (Monthly)
Issued by NWS Sterling, VA

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CXUS51 KLWX 011343
CLMDCA

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

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

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

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2016

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
RECORD
 HIGH              79   12/07/1998
 LOW              -13   12/31/1880
HIGHEST            68   12/27        66       2
LOWEST             17   12/16        17       0
AVG. MAXIMUM     49.2              46.8     2.4     58.8
AVG. MINIMUM     34.4              32.5     1.9     43.5
MEAN             41.8              39.7     2.1
DAYS MAX >= 90      0               0.0     0.0
DAYS MAX <= 32      1               1.8    -0.8
DAYS MIN <= 32     12              14.5    -2.5
DAYS MIN <= 0       0               0.0     0.0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         7.56   1901
 MINIMUM         0.19   1889
TOTALS           2.61              3.05   -0.44     4.84
DAILY AVG.       0.08              0.10   -0.02
DAYS >= .01         9               9.7    -0.7
DAYS >= .10         7               5.6     1.4
DAYS >= .50         2               2.4    -0.4
DAYS >= 1.00        1               0.5     0.5
GREATEST
 24 HR. TOTAL    1.03   12/06 TO 12/06
                        12/05 TO 12/06
                        12/06 TO 12/06

SNOWFALL (INCHES)
RECORDS
 TOTAL           16.6   2009
TOTALS              T               2.3    -2.3
SINCE 7/1           T               2.8    -2.8
SNOWDEPTH AVG.      0
DAYS >= TRACE       2               1.5     0.5
DAYS >= 1.0         0               0.7    -0.7
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL        T

DEGREE_DAYS
HEATING TOTAL     710               786     -76      421
 SINCE 7/1       1197              1481    -284      956
COOLING TOTAL       0                 0       0        1
 SINCE 1/1       1994              1549     445     1999
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              9.2
HIGHEST WIND SPEED/DIRECTION    45/330    DATE  12/18
HIGHEST GUST SPEED/DIRECTION    54/330    DATE  12/18

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            6
NUMBER OF DAYS PC             11
NUMBER OF DAYS CLOUDY         14

AVERAGE RH (PERCENT)     61

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                2     RAIN                       4
LIGHT RAIN               11     FREEZING RAIN              1
LT FREEZING RAIN          1     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                2     SLEET                      0
FOG                       9     FOG W/VIS <= 1/4 MILE      1
HAZE                      0

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

&&

WASHINGTON DC...RONALD REAGAN NATIONAL AIRPORT...

THE MONTHLY AVERAGE TEMPERATURE WAS 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 WASHINGTON DC AREA SINCE SNOWFALL
RECORDS BEGAN IN 1884.

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.

CLIMATE RECORDS HAVE BEEN KEPT AT RONALD REAGAN NATIONAL AIRPORT
SINCE AUGUST OF 1941. ADDITIONAL TEMPERATURE RECORDS FOR THE
WASHINGTON DC AREA EXTEND BACK TO JANUARY OF 1872. PRECIPITATION
RECORDS EXTEND BACK TO JANUARY OF 1871. SNOWFALL RECORDS BEGAN IN
JANUARY OF 1884.

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

$$

DH/WOODY!



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