Washington Weather can't be forecast more than a week or so in advance, but weather averages are good indicators of what to expect any month. The latitude and longitude can be used on a U.S. Naval Observatory Web site to find the time of twilight, sunrise, sunset and moon rise and moon set for any location on Earth. Click here for a link to this site.
Total precipitation includes rain and melted snow or sleet in inches.
Average snowfall is the month's snowfall in inches, while snow depth is the amount of snow on the ground in inches. Temperatures and precipitation are based on a period less than the 30-year average used to establish climate normals . More about weather averages .