Climatological Report (Monthly)
Issued by NWS Sterling, VA

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000
CXUS51 KLWX 010925
CLMDCA

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
525 AM EDT WED NOV 1 2017

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

...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 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              96   10/05/1941
 LOW               26   10/31/1917
                        10/31/1893
                        10/30/1873
HIGHEST            86   10/10        84       2
                        10/09
LOWEST             43   10/27        37       6
AVG. MAXIMUM     73.6              68.4     5.2       MM
AVG. MINIMUM     56.2              50.6     5.6       MM
MEAN             64.9              59.5     5.4
DAYS MAX >= 90      0               0.1    -0.1
DAYS MAX <= 32      0               0.0     0.0
DAYS MIN <= 32      0               0.0     0.0
DAYS MIN <= 0       0               0.0     0.0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         9.41   2005
 MINIMUM            T   1963
TOTALS           2.02              3.40   -1.38       MM
DAILY AVG.       0.07              0.11   -0.04
DAYS >= .01         9               7.7     1.3
DAYS >= .10         4               4.8    -0.8
DAYS >= .50         2               2.5    -0.5
DAYS >= 1.00        0               1.0    -1.0
GREATEST
 24 HR. TOTAL    0.97   10/29 TO 10/29

SNOWFALL (INCHES)
RECORDS
 TOTAL            2.2   1925
TOTALS            0.0               0.0     0.0
SINCE 7/1         0.0               0.0     0.0
SNOWDEPTH AVG.      0
DAYS >= TRACE       0               0.0     0.0
DAYS >= 1.0         0               0.0     0.0
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL      0.0

DEGREE_DAYS
HEATING TOTAL      87               205    -118       MM
 SINCE 7/1         93               229    -136       MM
COOLING TOTAL      91                34      57       MM
 SINCE 1/1       1823              1547     276       MM
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              8.1
HIGHEST WIND SPEED/DIRECTION    35/320    DATE  10/29
HIGHEST GUST SPEED/DIRECTION    47/320    DATE  10/29

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR           10
NUMBER OF DAYS PC             13
NUMBER OF DAYS CLOUDY          8

AVERAGE RH (PERCENT)     70

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              2     MIXED PRECIP               0
HEAVY RAIN                3     RAIN                       4
LIGHT RAIN               11     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      10     FOG W/VIS <= 1/4 MILE      1
HAZE                      3

-  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...

THE MONTHLY AVERAGE TEMPERATURE RANKED AS THE 3RD WARMEST ON RECORD.
MONTHLY PRECIPITATION WAS BELOW NORMAL.

THE LOW TEMPERATURE ON THE 8TH ONLY DROPPED TO 75 DEGREES. THIS IS
THE WARMEST LOW TEMPERATURE EVER RECORDED FOR THE MONTH OF OCTOBER.
THE PREVIOUS RECORD WAS 74 SET ON OCTOBER 4TH 1941 AND OCTOBER 4TH
AND 5TH 1898.

THREE DAYS HAD LOW TEMPERATURES IN THE 70S. THIS IS TIED WITH
1959...1954 AND 1898 FOR THE SECOND MOST ON RECORD IN OCTOBER. 1941
HAD 4 DAYS WITH LOW TEMPERATURES IN THE 70S.

FOUR DAILY WARM LOW TEMPERATURE RECORDS WERE SET LAST MONTH:
A LOW OF 75 DEGREES ON THE 8TH BROKE THE RECORD OF 68 SET IN 2007.
A LOW OF 74 DEGREES ON THE 9TH BROKE THE RECORD OF 72 SET IN 1959.
A LOW OF 72 DEGREES ON THE 10TH BROKE THE RECORD OF 69 SET IN 1990
AND 1959.
A LOW OF 67 DEGREES ON THE 11TH BROKE THE OLD RECORD OF 66 SET IN
1970...1959 AND 1904.

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).

$$

DH/HTS



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