751

CXUS51 KLWX 020247

CLMDCA



CLIMATE REPORT

NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC                  

947 PM EST SUN NOV 1 2009



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



...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 2009...



CLIMATE NORMAL PERIOD 1971 TO 2000

CLIMATE RECORD PERIOD 1871 TO 2009



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            85   10/09        84       1                       

LOWEST             39   10/18        37       2                       

AVG. MAXIMUM     66.1              68.0    -1.9     67.7              

AVG. MINIMUM     50.8              49.6     1.2     50.0              

MEAN             58.5              58.8    -0.3                       

DAYS MAX >= 90      0               0.1    -0.1                       

DAYS MAX <= 32      0               0.0     0.0                       

DAYS MIN <= 32      0               0.2    -0.2                       

DAYS MIN <= 0       0               0.0     0.0                       



PRECIPITATION (INCHES)

RECORD

 MAXIMUM         9.41   2005                                          

 MINIMUM            T   1963                                          

TOTALS           5.71              3.22    2.49     1.13              

DAILY AVG.       0.18              0.10    0.08                       

DAYS >= .01        13               7.8     5.2                       

DAYS >= .10         8               4.7     3.3                       

DAYS >= .50         5               2.3     2.7                       

DAYS >= 1.00        2               1.0     1.0                       

GREATEST

 24 HR. TOTAL    1.73   10/27 TO 10/28                                



SNOWFALL (INCHES)

RECORDS

 TOTAL            2.2   1925                                                            TOTALS           0.0                 T     0.0                       

TOTALS            0.0                 T     0.0

SINCE 7/1         0.0                 T     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     208               205       3      225              

 SINCE 7/1        216               231     -15      227              

COOLING TOTAL      14                28     -14       44              

 SINCE 1/1       1433              1527     -94     1713              

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



WIND (MPH)

AVERAGE WIND SPEED              8.4

HIGHEST WIND SPEED/DIRECTION    33/280    DATE  10/07

HIGHEST GUST SPEED/DIRECTION    45/270    DATE  10/07



SKY COVER

POSSIBLE SUNSHINE (PERCENT)   MM                                      



NUMBER OF DAYS FAIR            3

NUMBER OF DAYS PC             10

NUMBER OF DAYS CLOUDY         18



AVERAGE RH (PERCENT)     67



WEATHER CONDITIONS. NUMBER OF DAYS WITH 

THUNDERSTORM              0     MIXED PRECIP               0

HEAVY RAIN                4     RAIN                       8

LIGHT RAIN               18     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                      3                                           

                                                                    

-  INDICATES NEGATIVE NUMBERS.                                      

R  INDICATES RECORD WAS SET OR TIED.                                

MM INDICATES DATA IS MISSING.                                       

T  INDICATES TRACE AMOUNT.                                          



&&



THE AVERAGE MONTHLY TEMPERATURE THIS OCTOBER WAS NEAR NORMAL AT 

REAGAN NATIONAL AIRPORT (DCA). A SLOW MOVING STORM SYSTEM BROUGHT 

CLOUDY...WET AND VERY COOL CONDITIONS DURING THE MIDDLE OF THE 

MONTH. THE HIGH TEMPERATURE FAILED TO REACH 50F ON THE 16TH AND 

17TH...BREAKING THE LOW MAX TEMPERATURE RECORD FOR EACH DATE.



DCA EXPERIENCED WETTER THAN NORMAL CONDITIONS THIS OCTOBER...THE 

FIRST MONTH WITH ABOVE NORMAL PRECIPITATION SINCE JUNE. THIS MONTH 

WAS TIED FOR THE 15TH WETTEST OCTOBER ON RECORD IN WASHINGTON. ABOVE 

NORMAL RAINFALL HAS BEEN RECORDED SIX OUT OF THE LAST EIGHT 

OCTOBERS. MEASURABLE RAINFALL WAS OBSERVED ON 13 DAYS THIS 

MONTH...TIED FOR THE MOST OFTEN DURING THE MONTH OF OCTOBER SINCE 

1925.



$$

JRK/SMZ