Climatological Report (Monthly)
Issued by NWS Sterling, VA

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000
CXUS51 KLWX 042148
CLMIAD

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
448 PM EST SAT FEB 4 2017

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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF JANUARY 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1962 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
RECORD
 HIGH              75   01/29/1975
 LOW              -18   01/22/1984
HIGHEST            70   01/12        63       7
LOWEST              7   01/09         2       5
AVG. MAXIMUM     46.7              42.5     4.2     41.5
AVG. MINIMUM     32.1              23.9     8.2     21.4
MEAN             39.4              33.2     6.2
DAYS MAX >= 90      0               0.0     0.0
DAYS MAX <= 32      4               5.2    -1.2
DAYS MIN <= 32     14              24.3   -10.3
DAYS MIN <= 0       0               0.6    -0.6

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         6.61   1979
 MINIMUM         0.40   1981
TOTALS           2.73              2.68    0.05     4.47
DAILY AVG.       0.09              0.09    0.00
DAYS >= .01        14               9.9     4.1
DAYS >= .10         5               5.7    -0.7
DAYS >= .50         2               1.8     0.2
DAYS >= 1.00        0               0.5    -0.5
GREATEST
 24 HR. TOTAL    0.96   01/02 TO 01/03

SNOWFALL (INCHES)
RECORDS
 TOTAL           30.9   1996
TOTALS            1.0               7.3    -6.3
SINCE 7/1         1.0              11.3   -10.3
SNOWDEPTH AVG.      0
DAYS >= TRACE      10               3.5     6.5
DAYS >= 1.0         0               1.9    -1.9
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL      0.6

DEGREE_DAYS
HEATING TOTAL     786               986    -200     1033
 SINCE 7/1       2336              2784    -448     2286
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0        0
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              8.5
HIGHEST WIND SPEED/DIRECTION    37/290    DATE  01/26
HIGHEST GUST SPEED/DIRECTION    46/280    DATE  01/26

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.80
NUMBER OF DAYS FAIR            2
NUMBER OF DAYS PC             12
NUMBER OF DAYS CLOUDY         17

AVERAGE RH (PERCENT)     66

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       5
LIGHT RAIN               13     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       1
LIGHT SNOW                6     SLEET                      2
FOG                      14     FOG W/VIS <= 1/4 MILE      4
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 WELL ABOVE NORMAL...AND RANKED
AS THE FOURTH WARMEST JANUARY ON RECORD. MONTHLY PRECIPITATION WAS
NEAR NORMAL. SNOWFALL WAS WELL BELOW NORMAL.

THIS WAS THE LEAST SNOWIEST JANUARY IN THE DULLES VA AREA SINCE 2006.

A RECORD DAILY HIGH TEMPERATURE OF 70 DEGREES WAS SET ON THE
12TH...BREAKING THE OLD RECORD OF 63 SET IN 1995.

FIVE RECORD DAILY WARM LOW TEMPERATURES WERE SET IN JANUARY. THE LOW
OF 49 DEGREES ON THE 12TH BROKE THE OLD RECORD OF 41 SET IN 2013.
THE LOW OF 40 DEGREES ON THE 17TH TIED THE RECORD PREVIOUSLY SET IN
2012. THE LOW OF 46 ON THE 21ST BROKE THE OLD RECORD OF 40 SET IN
1972...AND THE LOW OF 46 ON THE 22ND BROKE THE OLD RECORD OF 38 SET
IN 1999. THE LOW OF 40 ON THE 26TH TIED THE RECORD PREVIOUSLY SET IN
2012.

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/BJL



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