Weather and Climate
During the 106 days the Lewis and Clark Expedition wintered at Fort Clatsop in 1806 it rained all but 12 days and they saw the sun 6 times.
We are not nearly so dreary, but we do see an average of 70 inches of rain a year and we are the foggiest location in the Lower 48 states. Summer months are usually nice with days ranging from 55-70 degrees. Winters are wet and mild, usually 40-55 degrees.
National Weather Service Station
In June of 1998 Fort Clatsop signed a Cooperative Agreement with the National Weather Service wherein Fort Clatsop would receive a basic Weather Station and would record daily weather observations (maximum and minimum temperatures and precipitation amounts) for the NWS. These observations are recorded on a monthly report and sent to the NWS office in Portland, Oregon.
The Resource Management Division at Fort Clatsop has compiled weather records for previous years from the NWS internet site for the Astoria Regional Airport, which for many years housed a National Weather Service Station. The Airport is located only about 2 miles from Fort Clatsop.
The climate of Fort Clatsop is continually mild and wet with annual precipitation averaging 70 inches. Seasonal and daily temperature fluctuations are minimal. Average monthly maximum temperatures range from 47 to 67 degrees F. Average minimums range from 35 to 53 degrees F.