Climatological Report (Monthly)
Issued by NWS Sterling, VA

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CXUS51 KLWX 011054
CLMDCA

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
420 AM EST TUE JAN 1 2019

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

...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2018

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            67   12/21        66       1
LOWEST             26   12/11        17       9
AVG. MAXIMUM     50.1              46.8     3.3     46.3
AVG. MINIMUM     36.8              32.5     4.3     32.1
MEAN             43.5              39.7     3.8
DAYS MAX >= 90      0               0.0     0.0
DAYS MAX <= 32      0               1.8    -1.8
DAYS MIN <= 32      8              14.5    -6.5
DAYS MIN <= 0       0               0.0     0.0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         7.56   1901
 MINIMUM         0.19   1889
TOTALS           5.82              3.05    2.77     0.50
DAILY AVG.       0.19              0.10    0.09
DAYS >= .01        11               9.7     1.3
DAYS >= .10         9               5.6     3.4
DAYS >= .50         3               2.4     0.6
DAYS >= 1.00        2               0.5     1.5
GREATEST
 24 HR. TOTAL    2.55   12/15 TO 12/15

SNOWFALL (INCHES)
RECORDS
 TOTAL           16.6   2009
TOTALS            0.0               2.3    -2.3
SINCE 7/1         1.4               2.8    -1.4
SNOWDEPTH AVG.      0
DAYS >= TRACE       0               1.5    -1.5
DAYS >= 1.0         0               0.7    -0.7
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL      0.0

DEGREE_DAYS
HEATING TOTAL     659               786    -127      792
 SINCE 7/1       1399              1481     -82     1341
COOLING TOTAL       0                 0       0        0
 SINCE 1/1       2053              1549     504     1826
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              7.7
HIGHEST WIND SPEED/DIRECTION    28/290    DATE  12/22
HIGHEST GUST SPEED/DIRECTION    38/300    DATE  12/22

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.70
NUMBER OF DAYS FAIR            3
NUMBER OF DAYS PC             12
NUMBER OF DAYS CLOUDY         16

AVERAGE RH (PERCENT)     66

WEATHER CONDITIONS. NUMBER OF DAYS WITH
  0
  7
  0
  0
  0
  0
  2
HAZE                      1

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

$$


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