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000
CXUS51 KLWX 011439
CLMDCA

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1039 AM EDT FRI OCT 01 2021

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

...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2021...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1871 TO 2021

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE
                                          NORMAL
..............................................................
TEMPERATURE (F)
RECORD
 HIGH            104   09/07/1881
 LOW              36   09/23/1904
HIGHEST           90   09/13         92      -2       91
                       09/15
LOWEST            54   09/30         48       6       46
AVG. MAXIMUM    81.7               80.7     1.0     78.0
AVG. MINIMUM    64.7               64.1     0.6     62.4
MEAN            73.2               72.4     0.8     70.2
DAYS MAX >= 90     2                3.6    -1.6        2
DAYS MAX <= 32     0                0.0     0.0        0
DAYS MIN <= 32     0                0.0     0.0        0
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM       17.45   1934
 MINIMUM        0.11   2005
TOTALS          4.03               3.93    0.10     5.53
DAILY AVG.      0.13               0.13   -0.00     0.18
DAYS >= .01        7                8.7    -1.7       13
DAYS >= .10        5                5.8    -0.8        9
DAYS >= .50        3                2.5     0.5        2
DAYS >= 1.00       2                1.0     1.0        1
GREATEST
 24 HR. TOTAL   1.63   09/22 TO 09/23               3.44
 STORM TOTAL    1.34                                2.88
 (MM/DD(HH))

SNOWFALL (INCHES)
RECORDS
 TOTAL            MM   MM
TOTALS           0.0                0.0     0.0      0.0
SINCE 7/1        0.0                0.0     0.0       MM
DAYS >= TRACE      0                0.0     0.0        0
DAYS >= 1.0        0                0.0     0.0        0
GREATEST
 SNOW DEPTH        0                                   0

DEGREE DAYS
HEATING TOTAL      0                 16     -16       30
 SINCE 7/1         0                 14     -14       MM
COOLING TOTAL    256                238      18      193
 SINCE 1/1      1775               1690      85       MM
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              7.6
HIGHEST WIND SPEED/DIRECTION    32/170
HIGHEST GUST SPEED/DIRECTION    41/240
                                41/180

SKY COVER
AVERAGE SKY COVER           0.52

AVERAGE RH (PERCENT)     66

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              6     MIXED PRECIP               0
HEAVY RAIN                5     RAIN                       4
LIGHT RAIN               10     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       8     FOG W/VIS <= 1/4 MILE      0
HAZE                      6

-  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 AVERAGE TEMPERATURE IN SEPTEMBER 2021 WAS SLIGHTLY ABOVE NORMAL.
IT WAS THE WARMEST SEPTEMBER SINCE 2019, WHEN THE AVERAGE TEMPERATURE
WAS 76.5 DEGREES.

TOTAL PRECIPITATION WAS 103 PERCENT OF NORMAL. IT WAS THE DRIEST
SEPTEMBER SINCE 2019, WHEN ONLY 0.25 INCHES OF PRECIPITATION FELL.

NO DAILY RECORDS WERE SET IN SEPTEMBER 2021.

WEATHER RECORDS FOR THE WASHINGTON DC AREA HAVE BEEN RECORDED AT
WHAT IS NOW RONALD REAGAN WASHINGTON NATIONAL AIRPORT SINCE 1941.
THE OFFICIAL WEATHER RECORD CONSISTS OF THAT DATA BACK TO 1945, AND
OBSERVATIONS TAKEN IN DOWNTOWN WASHINGTON FROM 1871 THROUGH 1944.
TEMPERATURE RECORDS FOR THE WASHINGTON DC AREA EXTEND BACK TO
JANUARY OF 1872, WITH PRECIPITATION RECORDS EXTENDING BACK TO
JANUARY OF 1871 AND SNOWFALL RECORDS EXTENDING BACK TO JANUARY OF
1884.

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

$$

RCM