Climatological Report (Monthly)
Issued by NWS Sterling, VA

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CXUS51 KLWX 021857
CLMIAD

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

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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF JANUARY 2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1960 TO 2018

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                  01/07         2      -3
AVG. MAXIMUM     43.3              42.5     0.8     46.7
AVG. MINIMUM     21.4              23.9    -2.5     32.1
MEAN             32.4              33.2    -0.8
DAYS MAX >= 90      0               0.0     0.0
DAYS MAX <= 32     10               5.2     4.8
DAYS MIN <= 32     25              24.3     0.7
DAYS MIN <= 0       1               0.6     0.4

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         6.61   1979
 MINIMUM         0.40   1981
TOTALS           1.79              2.68   -0.89     2.73
DAILY AVG.       0.06              0.09   -0.03
DAYS >= .01         7               9.9    -2.9
DAYS >= .10         4               5.7    -1.7
DAYS >= .50         2               1.8     0.2
DAYS >= 1.00        0               0.5    -0.5
GREATEST
 24 HR. TOTAL    0.91   01/12 TO 01/12

SNOWFALL (INCHES)
RECORDS
 TOTAL           30.9   1996
TOTALS            0.4               7.3    -6.9
SINCE 7/1         5.0              11.3    -6.3
SNOWDEPTH AVG.      0
DAYS >= TRACE       7               3.5     3.5
DAYS >= 1.0         0               1.9    -1.9
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL      0.3

DEGREE_DAYS
HEATING TOTAL    1003               986      17      786
 SINCE 7/1       2720              2784     -64     2336
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0        0
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              9.2
HIGHEST WIND SPEED/DIRECTION    37/320    DATE  01/04
HIGHEST GUST SPEED/DIRECTION    49/320    DATE  01/04

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR           11
NUMBER OF DAYS PC             10
NUMBER OF DAYS CLOUDY         10

AVERAGE RH (PERCENT)     64

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                2     RAIN                       2
LIGHT RAIN                5     FREEZING RAIN              0
LT FREEZING RAIN          1     HAIL                       0
HEAVY SNOW                0     SNOW                       2
LIGHT SNOW                5     SLEET                      1
FOG                       8     FOG W/VIS <= 1/4 MILE      1
HAZE                      2

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

&&

WASHINGTON DULLES INTERNATIONAL AIRPORT...

...6TH LEAST SNOWY JANUARY ON RECORD AT DULLES...

THE MONTHLY AVERAGE TEMPERATURE WAS SLIGHTLY BELOW 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. IT WAS THE COLDEST JANUARY SINCE 2016.

MONTHLY PRECIPITATION WAS ONLY 67 PERCENT OF NORMAL. IT WAS THE
DRIEST JANUARY SINCE 2008, WHEN ONLY 1.26 INCHES OF PRECIPITATION
FELL.

MONTHLY SNOWFALL WAS ONLY 5 PERCENT OF NORMAL. THIS MAKES JANUARY
2018 THE 6TH LEAST SNOWY ON RECORD. IT WAS THE LEAST SNOWY JANUARY
SINCE 2006, WHEN ONLY A TRACE OF SNOW FELL.

A DAILY RECORD LOW MAXIMUM TEMPERATURE OF 23 DEGREES WAS SET ON
JANUARY 1ST. THIS BROKE THE OLD RECORD OF 26 DEGREES SET IN 1977.

A DAILY RECORD LOW MINIMUM TEMPERATURE OF 1 DEGREE WAS SET ON
JANUARY 3RD. THIS BROKE THE OLD RECORD OF 8 DEGREES SET IN 1979 AND
1971.

A DAILY RECORD LOW MAXIMUM TEMPERATURE OF 19 DEGREES WAS SET ON
JANUARY 5TH. THIS BROKE THE OLD RECORD OF 21 DEGREES SET IN 1968.

A DAILY RECORD LOW MAXIMUM TEMPERATURE OF 19 DEGREES WAS SET ON
JANUARY 6TH. THIS BROKE THE OLD RECORD OF 20 DEGREES SET IN 1988.

A DAILY RECORD LOW MINIMUM TEMPERATURE OF -1 DEGREE WAS SET ON
JANUARY 7TH. THIS BROKE THE OLD RECORD OF 1 DEGREE SET IN 2014.

A DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 70 DEGREES WAS SET ON
JANUARY 12TH. THIS TIED THE OLD RECORD OF 70 SET IN 2017.

A DAILY RECORD HIGH MINIMUM TEMPERATURE OF 58 DEGREES WAS SET ON
JANUARY 12TH. THIS BROKE THE OLD RECORD OF 49 DEGREES SET IN 2017.

A DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 63 DEGREES WAS SET ON
JANUARY 21ST. THIS BROKE THE OLD RECORD OF 62 DEGREES SET IN 2006.

A DAILY RECORD HIGH MINIMUM TEMPERATURE OF 48 DEGREES WAS SET ON
JANUARY 22ND. THIS BROKE THE OLD RECORD OF 46 DEGREES SET IN 2017.

A DAILY RECORD HIGH MINIMUM TEMPERATURE OF 45 DEGREES WAS SET ON
JANUARY 28TH. THIS BROKE THE OLD RECORD OF 35 DEGREES SET IN 1998,
1990, 1974 AND 1973.

TEMPERATURE AND PRECIPITATION RECORDS AT WASHINGTON DULLES
INTERNATIONAL AIRPORT BEGAN IN 1960. SNOWFALL RECORDS BEGAN IN 1962.

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

$$

RCM


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