Seneca Average Rainfall by Month

This page shows the average precipitation in each month of the year in Seneca, Oregon. It is based on NOAA data for the years 1991–2020.
What's the Rainiest Month in Seneca?
In Seneca, May has the greatest precipitation of any month. On average, Seneca gets 1.7 inches of precipitation in May.
However, November is the month with the greatest chance of precipitation. 39.1% of days in November will have at least some rain.
What's the Driest Month in Seneca?
In Seneca, August has the least precipitation of any month. On average, Seneca gets 0.42 inches of precipitation in August.
August is also the month where rain is least common. 10.3% of days in August will have measurable rain.
Month Precipitation % Chance
January 1.53 in 38.0
February 0.98 in 36.6
March 1.23 in 36.2
April 1.15 in 37.3
May 1.66 in 30.2
June 1.12 in 24.1
July 0.53 in 12.7
August 0.42 in 10.3
September 0.61 in 15.3
October 1.07 in 25.1
November 1.35 in 39.1
December 1.59 in 42.5
Year 13.32 in 29.2
Weather Station Details
Years Station Coordinates
1908–2021 Seneca location
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