Climatological Report (Monthly)
Issued by NWS Sterling, VA

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CXUS51 KLWX 042146
CLMDCA

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

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

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

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
RECORD
 HIGH              79   01/26/1950
 LOW              -14   01/01/1881
HIGHEST            72   01/12        65       7
LOWEST             15   01/08        12       3
AVG. MAXIMUM     48.5              43.4     5.1     42.5
AVG. MINIMUM     35.7              28.6     7.1     27.3
MEAN             42.1              36.0     6.1
DAYS MAX >= 90      0               0.0     0.0
DAYS MAX <= 32      3               4.4    -1.4
DAYS MIN <= 32      8              19.3   -11.3
DAYS MIN <= 0       0               0.1    -0.1

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         7.83   1937
 MINIMUM         0.31   1955
TOTALS           2.75              2.81   -0.06     2.68
DAILY AVG.       0.09              0.09    0.00
DAYS >= .01        13               9.6     3.4
DAYS >= .10         6               5.6     0.4
DAYS >= .50         2               2.1    -0.1
DAYS >= 1.00        0               0.6    -0.6
GREATEST
 24 HR. TOTAL    0.91   01/02 TO 01/03

SNOWFALL (INCHES)
RECORDS
 TOTAL           31.5   1922
TOTALS            1.4               5.6    -4.2
SINCE 7/1         1.4               8.4    -7.0
SNOWDEPTH AVG.      0
DAYS >= TRACE       5               3.0     2.0
DAYS >= 1.0         1               1.6    -0.6
GREATEST
 SNOW DEPTH         1   01/30
 24 HR TOTAL      1.0

DEGREE_DAYS
HEATING TOTAL     701               899    -198      923
 SINCE 7/1       1898              2380    -482     1879
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0        0
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              9.5
HIGHEST WIND SPEED/DIRECTION    37/060    DATE  01/23
HIGHEST GUST SPEED/DIRECTION    47/050    DATE  01/23

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.80
NUMBER OF DAYS FAIR            2
NUMBER OF DAYS PC              5
NUMBER OF DAYS CLOUDY         24

AVERAGE RH (PERCENT)     66

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                2     RAIN                       6
LIGHT RAIN               13     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                1     SNOW                       1
LIGHT SNOW                5     SLEET                      1
FOG                      14     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.

&&

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

THE MONTHLY AVERAGE TEMPERATURE WAS WELL ABOVE NORMAL. MONTHLY
PRECIPITATION WAS NEAR NORMAL. SNOWFALL WAS WELL BELOW NORMAL.

THIS WAS THE LEAST SNOWIEST JANUARY IN THE WASHINGTON DC AREA SINCE
2013. IT WAS ALSO THE WARMEST JANUARY SINCE 2006.

TWO RECORD DAILY WARM LOW TEMPERATURES WERE SET IN JANUARY. THE LOW
OF 51 DEGREES ON THE 12TH BROKE THE OLD RECORD OF 47 SET IN 1890.
THE LOW OF 47 DEGREES ON THE 21ST BROKE THE OLD RECORD OF 44 SET IN
1906.

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/BJL


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