Gilliam County Climate
Gilliam County, Oregon
Avg Annual Temp
51.7°F
Annual Precip
11.7"
Annual Snowfall
15.4"
Extreme Heat Days
31.1
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Gilliam County Weather
A Warm and Very Arid Landscape
Gilliam County averages 51.7°F annually, placing it near the national median for temperature. Its 11.7 inches of annual precipitation, however, makes it one of the drier regions in the country.
Warmer but Much Drier than Oregon
The county is slightly warmer than the state average of 50.5°F. Conversely, it receives only a fraction of the state's average rainfall, seeing just 11.7 inches compared to 37.4 inches statewide.
A Warmer Pocket in Northern Oregon
Gilliam's average temperature of 51.7°F is higher than neighboring Jefferson County at 48.5°F. It shares a similar arid profile with other regional neighbors, maintaining very low annual precipitation.
Hot Summers and Light Snowfall
July is hot with an average of 72.3°F and 31 days of extreme heat exceeding 90°F. Winters are manageable, featuring a January average of 34.1°F and 15.4 inches of total annual snowfall.
Prioritize Cooling and Water Management
With 31 extreme heat days, efficient air conditioning is a necessity for residents. The extremely low rainfall of 11.7 inches suggests that xeriscaping is the most practical choice for outdoor spaces.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.