Map of rainfall totals, July 28 and 29, 2017. (Jordan Tessler)

A rare winterlike storm, but in late July, drenched the Washington region with widespread rainfall totals of 1.5 to six inches Friday and Saturday. A few places even saw totals exceeding seven inches.

Washington’s official observing site, Reagan National Airport, logged 3.78 inches of rain. 3.31 inches fell Friday alone, a record amount for July 28 — and marking the seventh-wettest July day since records began in 1872. In the course of about 24 hours, the airport received the equivalent of an average month’s supply of rain (3.73 inches).

Thanks to the 3.78 inches of rain from this event, Reagan has registered 9.15 inches for the month, which ranks as the sixth-wettest July on record in Washington.

Baltimore-Washington International Airport also set a daily rainfall record Friday, picking up 2.58 inches. It tacked on another 1.36 inches Saturday for a storm total of 3.94 inches.

Amounts of three to four inches turned out to be most common around the region. The heaviest rainfall totals of five to seven inches concentrated in northeast Montgomery County through southern Howard County.

Incredibly, one weather observer northwest of Silver Spring recorded 3.19 inches in just 45 minutes Friday before noon.

The lowest amounts fell in the west and southwest portions of our region. For example, Washington Dulles International Airport posted just 1.62 inches for the event. Even so, it has tallied 8.8 inches this month — the most on record (although records at Dulles only date back to 1963).

Below, find some select rainfall totals (complete list) from around the region.


  • Manassas: One to two inches
  • Haymarket: 2.49 inches
  • Leesburg: 2.56 inches
  • Centreville: 2.74 inches
  • Dumfries: 3.31 inches
  • Arlington: Three to four inches
  • Vienna: Three to five inches
  • Falls Church: Four to five inches

The District

  • The Washington Post: 2.92 inches
  • White House: 3.0 inches
  • Dalecarlia Reservoir: 3.2 inches
  • Arboretum: 4.8 inches


  • Patuxent River: Two inches
  • Annapolis: 2.28 inches
  • Oxon Hill: 2.45 inches
  • Ellicott City: 2.7 inches
  • Waldorf: 2.88 inches
  • Bowie: 2.89 inches
  • Rockville: Three to four inches
  • Upper Marlboro: 3.86 inches
  • Laurel: About four inches
  • Damascus: 4.03 inches
  • College Park: 4.65 inches
  • Germantown: 4.75 inches
  • Huntington: 4.75 inches
  • Columbia: Three to six inches
  • Silver Spring: 5.61 inches
  • Glenmont: 5.64 inches
  • Takoma Park: 5.73 inches
  • Garrett Park: 5.79 inches
  • Gaithersburg: 5.88 inches
  • Olney: 6.86 inches