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Climate Statistics · City

Normal annual rainfall in Boise

1991–2020 · 1 data point Updated Oct 21, 2026
Climate · Boise

Source: NOAA National Centers for Environmental Information — GHCN-Daily, 1991–2020

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Latest value · 1991–2020 11.5 in
Weather through the year long-term average 1991–2020 · Boise Air Terminal weather station, 6 km away
39° 25°
Jan
46° 29°
Feb
55° 35°
Mar
62° 39°
Apr
72° 47°
May
81° 54°
Jun
93° 62°
Jul
91° 61°
Aug
80° 52°
Sep
65° 41°
Oct
49° 31°
Nov
39° 25°
Dec
1.4
1.0
1.3
1.2
1.4
0.7
0.2
0.2
0.4
0.8
1.2
1.5
High and low, °F Precipitation, inches

Source: NOAA National Centers for Environmental Information — GHCN-Daily, 1991–2020

What it means

How much rain and snow (as water) falls in a typical year.

How it is calculated

Sum of the twelve monthly precipitation normals at the nearest weather station: 1991–2020, or the latest ten years; months with a few missing days are scaled up.