Idaho local data guide

Average Annual Snowfall in Boise, Idaho

Boise receives an average of 17.6 inches of snowfall annually, based on the official 1991–2020 climatological period recorded by the National Weather Service. While this long-term average provides a baseline for planning, local snowfall is highly variable from year to year.

Updated with grounded research as of 2026-09-08.

The short answer

The official 30-year average annual snowfall for Boise, Idaho, is 17.6 inches, as measured at the Boise Airport weather station. Residents should expect significant seasonal variability, as actual annual totals can fluctuate widely based on specific weather patterns.

Key facts

Average Annual Snowfall (1991–2020 Normal)
17.6 inches
Observed Variability
Annual totals fluctuate, often ranging from a few inches to over 40 inches.

Understanding Boise's Climate Normals

The 'normal' snowfall figure of 17.6 inches is a climatological standard derived from the 1991–2020 period by the National Weather Service. This number represents the official measurement taken at the Boise Airport. It is important to view this as a multi-decade average rather than a prediction for any specific winter, as Boise's high-desert climate often produces years that deviate significantly from this mean.

Geographic Variability

Snowfall totals are not uniform across the Treasure Valley. Because official measurements are recorded at the airport, residents living in the Boise foothills or higher-elevation areas surrounding the city often experience significantly higher snowfall accumulation than the city center. When planning for property maintenance or commuting, account for these microclimates, which can vary sharply over just a few miles.

Seasonal Expectations

Boise winters are characterized by variability. Historical data indicates that while the average is 17.6 inches, it is not uncommon for the region to experience light winters with minimal accumulation or heavier seasons where totals exceed 40 inches. This inconsistency is a standard feature of the regional climate, influenced by broader weather patterns across the Pacific Northwest.

Common questions

Does it snow every year in Boise?

Yes, Boise receives snowfall annually, though the amount varies drastically. Historical records show some years with very little snow and others with substantial accumulation.

How does elevation affect snowfall in the Boise area?

There is a distinct gradient; as you move from the airport and valley floor toward the foothills and mountains, annual snowfall totals increase significantly.

Related Idaho questions

  • What is the average annual precipitation in Boise, Idaho?
  • When does it typically snow in Boise?
  • How does Boise's snowfall compare to nearby mountain areas like Bogus Basin?

Sources and verification