National Weather Service United States Department of Commerce

Atmospheric River in the Pacific Northwest and Northern Rockies this Weekend

A Pacific storm and atmospheric river will impact the Pacific Northwest states and northern Rockies this weekend, bringing locally heavy low elevations rain and heavy high elevation snow in the mountains. By Sunday over the Interior Northwest, rain combined with snowmelt will increase the risk of flood hazards. Flood Watches are in effect. Read More >

Baltimore/Washington

Weather Forecast Office

Normals, Means, and Extremes

Weather.gov > Baltimore/Washington > Normals, Means, and Extremes

How to obtain information for daily & monthly normal & extremes
(temperature, precipitation, and snowfall)
 

You can get data for:

  • Washington DC (includes DCA)

  • Baltimore (includes BWI)

  • Sterling-Dulles Airport (includes IAD)

  • Baltimore Downtown (includes DMH)

  • Annapolis (includes NAK)

  • Hagerstown (includes HGR)

  • Charlottesville (includes CHO) Airport

and several other locations

 

** For official data contact National Centers for Environmental Information **

 

How to obtain daily & monthly normals/averages (includes snowfall):
Click here 
  • Select "1. Location"
  • Under "2. Product", select "Daily/monthly normals"
  • Under "3. Options" choose "Monthly" or "Daily", and then the "Variable" that you want
  • Finally hit "Go". Created is a graph with a chart of values below
How to obtain monthly extremes (includes snowfall):
Click here 
  • Select "1. Location"
  • Under "2. Product", select "Monthly summarized data"
  • Under "3. Options" select the year range (note you can type POR for Period of Record)
  • Select the "Variable", and then under "Summary" select "Daily Maximum" or "Daily Minimum"
  • Finally hit "Go"
How to obtain daily extremes (includes snowfall):
Click here 
  • Select "1. Location"
  • Under "2. Product", select "Calendar day summaries"
  • Under "3. Options" select the year range (note you can type POR for Period of Record)
  • Select the "Variable", and then under "Summary" make your selection
  • Finally hit "Go"
 
Click HERE to obtain other information on daily extremes/normals
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