It rains on D.C.’s “Bike to Work” day a disproportionate amount


On Friday, it’s “Bike to Work” day in D.C., but it may as well be “Wear a Life Jacket to Work” day given the torrents of rain forecast.  Biking enthusiasts have complained that it “always” rains on their parade, so I decided to check out this claim.

I examined rainfall amounts on the last 10 day “Bike to Work” days from 2004-2013.  With the exception of 2004, when it was held on May 7, Bike to Work day has always occurred on the third Friday of the month.

Of the 10 total days, there has been measurable rain on 5 of the 10 and at least a trace of rain on 7 of the 10.

On average, there are about 12 days with measurable rain during the month of May – or on about 38 percent of the days.  So “Bike to Work” day’s 50 percent average is above the norm.

Here’s the actual rainfall data from the past 10 “Bike to Work days:

2013: No rain
2012: No rain
2011: Trace
2010: No rain
2009: 0.15″
2008: 0.53″
2007: Trace
2006: 0.03″
2005: 2.63″
2004: 0.20″

We actually hit a good stretch between 2010 and 2013 with essentially no rain, but it was pretty wet in the years prior.

Unfortunately, the recent run of good luck ends tomorrow (Friday) which has the potential to mimic the deluge of 2005.

Jason is currently the Washington Post’s weather editor. A native Washingtonian, Jason has been a weather enthusiast since age 10.
Comments
Show Comments
Most Read Local

Heat Tracker

36
90-degree days year-to-date
Yearly Average
36
Record Most
67 (1980,2010)
Record Fewest
7 (1886,1905)
Last Year
24

At a Glance

Tue.

thunderstorms
78° /91°
Drop 30%

Wed.

partlycloudyday
73° /90°

Thu.

thunderstorms
71° /87°
Drop 60%

Fri.

thunderstorms
71° /83°
Drop 50%

Sat.

thunderstorms
71° /82°

Sun.

partlycloudyday
69° /83°
National Airport
Dulles
BWI

Right Now

D.C. Area Almanac

 
National
Dulles
BWI
Avg. High
 
Avg. Low
 
Rec. High
 
Rec. Low
 
Sunrise
 
Sunset
°F
 
 
°C
Next Story
David Streit · May 15, 2014