Climatological Report (Monthly)
Issued by NWS Sterling, VA

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000
CXUS51 KLWX 021832
CLMDCA

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
132 PM EST FRI FEB 2 2018

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

...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR THE MONTH OF JANUARY 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   01/26/1950
 LOW              -14   01/01/1881
HIGHEST            68   01/23        65       3
LOWEST              8   01/07        12      -4
AVG. MAXIMUM     44.7              43.4     1.3     48.5
AVG. MINIMUM     26.7              28.6    -1.9     35.7
MEAN             35.7              36.0    -0.3
DAYS MAX >= 90      0               0.0     0.0
DAYS MAX <= 32      8               4.4     3.6
DAYS MIN <= 32     23              19.3     3.7
DAYS MIN <= 0       0               0.1    -0.1

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         7.83   1937
 MINIMUM         0.31   1955
TOTALS           0.94              2.81   -1.87     2.75
DAILY AVG.       0.03              0.09   -0.06
DAYS >= .01         7               9.6    -2.6
DAYS >= .10         5               5.6    -0.6
DAYS >= .50         0               2.1    -2.1
DAYS >= 1.00        0               0.6    -0.6
GREATEST
 24 HR. TOTAL    0.37   01/12 TO 01/12

SNOWFALL (INCHES)
RECORDS
 TOTAL           31.5   1922
TOTALS            1.2               5.6    -4.4
SINCE 7/1         3.1               8.4    -5.3
SNOWDEPTH AVG.      0
DAYS >= TRACE       5               3.0     2.0
DAYS >= 1.0         0               1.6    -1.6
GREATEST
 SNOW DEPTH         1   01/05
                        01/04
 24 HR TOTAL      0.8

DEGREE_DAYS
HEATING TOTAL     900               899       1      701
 SINCE 7/1       2241              2380    -139     1898
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0        0
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              9.9
HIGHEST WIND SPEED/DIRECTION    36/300    DATE  01/13
HIGHEST GUST SPEED/DIRECTION    49/310    DATE  01/04

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR           10
NUMBER OF DAYS PC             11
NUMBER OF DAYS CLOUDY         10

AVERAGE RH (PERCENT)     59

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                2     RAIN                       2
LIGHT RAIN                7     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       1
LIGHT SNOW                4     SLEET                      1
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 WASHINGTON NATIONAL AIRPORT...

...4TH DRIEST JANUARY ON RECORD IN WASHINGTON DC...

THE AVERAGE TEMPERATURE IN JANUARY WAS NEAR NORMAL. THIS WAS THE
RESULT OF EXTREME COLD AT THE BEGINNING OF THE MONTH BEING AVERAGED
WITH SIGNIFICANT WARM SPELLS DURING THE MIDDLE AND LATTER PORTIONS
OF THE MONTH.

MONTHLY PRECIPITATION WAS ONLY 33 PERCENT OF NORMAL. THIS MAKES
JANUARY 2018 THE 4TH DRIEST ON RECORD. IT WAS THE DRIEST JANUARY
SINCE 1981, WHEN 0.38 INCHES OF PRECIPITATION FELL.

MONTHLY SNOWFALL WAS ONLY 21 PERCENT OF NORMAL. IT WAS THE LEAST
SNOWY JANUARY SINCE 2013, WHEN 0.9 INCHES OF SNOW FELL.

A DAILY RECORD HIGH MINIMUM TEMPERATURE OF 57 DEGREES WAS SET ON
JANUARY 12TH. THIS BROKE THE OLD RECORD OF 51 SET IN 2017.

CLIMATE RECORDS HAVE BEEN KEPT AT RONALD REAGAN WASHINGTON NATIONAL
AIRPORT SINCE AUGUST OF 1941. ADDITIONAL TEMPERATURE RECORDS FOR THE
WASHINGTON DC AREA OBSERVED DOWNTOWN 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).

$$

RCM



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