October recap: A month with meaningful moisture
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At Reagan National Airport (DCA), October marks the fifth cooler than average month in the last six (though just barely, at -0.3 degrees below the mean). But most will remember the month for the dismal stretches of clouds and rain. 5.71" of rain fell during the month at Reagan National Airport (DCA), nearly 2.5" above average. October's rain surplus puts us in the black for the year, after we fell a little behind in September. Here are excerpts from the National Weather Service summaries for the month for DCA, Dulles Airport (IAD), and Baltimore-Washington International (BWI)...
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.
Keep reading for the rest of the climate summaries
DCA EXPERIENCED ...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.
THE AVERAGE MONTHLY TEMPERATURE WAS SLIGHTLY ABOVE NORMAL...MAINLY DUE TO THE LOW TEMPERATURE BEING WELL ABOVE NORMAL. A READING OF 87F ON THE 9TH TIED FOR THE SECOND WARMEST HIGH TEMPERATURE FOR THAT DAY.
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 DURING A THREE DAY-PERIOD BETWEEN OCTOBER 15-17...WHICH TIED FOR THE LONGEST STRETCH OF CONSECUTIVE DAYS NOT REACHING 50F DURING ANY OCTOBER AT DULLES SINCE 1962.
DULLES HAD ABOVE NORMAL PRECIPITATION THIS MONTH FOR THE FIRST TIME SINCE JUNE 2009. IT WAS THE 8TH WETTEST OCTOBER ON RECORD. WETTER THAN NORMAL CONDITIONS HAVE OCCURRED SIX OUT OF THE LAST EIGHT OCTOBERS. AT LEAST 0.50 INCHES OF PRECIPITATION FELL ON SIX DAYS THIS MONTH...WHICH TIED FOR THE MOST OCCURRENCES OF HALF INCH OR HIGHER RAINFALL EVENTS FOR ANY OCTOBER SINCE 1976.
RAINFALL OF 1.69 INCHES ON THE 24TH SET A DAILY RECORD FOR THE DATE AT DULLES.
BALTIMORE-WASHINGTON AIRPORT (BWI) EXPERIENCED SLIGHTLY COOLER THAN NORMAL TEMPERATURES THIS OCTOBER. A SLOW MOVING STORM SYSTEM BROUGHT CLOUDY...WET AND VERY COOL CONDITIONS DURING THE MIDDLE OF THE MONTH. FROM THE 14TH THROUGH THE 17TH THE HIGH TEMPERATURE WAS 50F OR LESS...THE LONGEST STRETCH OF CONSECUTIVE DAYS DURING THE MONTH OF OCTOBER OF MAX TEMPS OF 50F OR LESS SINCE 1872. FOUR LOW MAXIMUM TEMPERATURE RECORDS WERE SET FROM THE 14TH THROUGH THE 17TH.
THIS OCTOBER TIED FOR THE 12TH WETTEST OCTOBER EVER ON RECORD IN BALTIMORE. ABOVE NORMAL RAINFALL WAS RECORDED FIVE OUT OF THE LAST SEVEN MONTHS AND SIX OUT OF THE LAST EIGHT OCTOBERS. MEASURABLE RAINFALL WAS OBSERVED ON 13 DAYS THIS MONTH...TIED FOR THE MOST OFTEN DURING OCTOBER SINCE 1906. AT LEAST 0.50 INCHES OF PRECIPITATION FELL ON SIX DAYS THIS MONTH...THE MOST OCCURRENCES ON RECORD FOR THE MONTH OF OCTOBER.
Bold text = CWG emphasis
Related link: After the deluge: The cold, hard local climate facts
| November 2, 2009; 11:00 AM ET
Categories: Local Climate, Recaps
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