Whatcom County Climate
Whatcom County, Washington
Avg Annual Temp
50.0°F
Annual Precip
59.7"
Annual Snowfall
29.7"
Extreme Heat Days
4.85
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Whatcom County Weather
Whatcom’s Cool and Wet Border Climate
Whatcom County averages 50.0°F annually, which is slightly cooler than the national median. The region is known for its high precipitation and moderate maritime temperatures.
Perfectly Aligned with State Averages
The county's average temperature of 50.0°F is nearly identical to the Washington state average of 49.9°F. However, its 59.7 inches of precipitation is much higher than the state's 38.5-inch average.
Snowier than the Southern Puget Sound
Whatcom sees 29.7 inches of snow annually, which is vastly more than Thurston County’s 3.9 inches. This is due to its northern position and proximity to cold mountain air currents.
Mild Summers and Snowy Winters
The county only experiences 5 extreme heat days per year, with summer averages staying cool at 63.0°F. Winters are chilly, averaging 37.6°F with significant seasonal snowfall.
Prepare for Snow and Rain
Residents need to be ready for both 59.7 inches of rain and nearly 30 inches of snow. While AC is rarely urgent due to few 90°F days, reliable heating and waterproof layers are mandatory.
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.