Ada County · Idaho
Boise, ID weather averages
NOAA climate normals for 1991-2020, measured at Boise Air Terminal, 6 km from the city centre — month by month temperature, rain and snow.
Quick answer
Boise averages a daily high of 63.6°F and a daily low of 41.3°F across the year, with 11.73 inches of precipitation. July is the warmest month at 91.2°F and December the coldest at 24°F.
- Average annual high
- 63.6°FWarmest month July
- Average annual low
- 41.3°FColdest month December
- Precipitation per year
- 11.73 inWettest month December
- Snowfall per year
- 19.2 in100.9 days at or below 32°F
Boise weather month by month
Normal daily high and low, precipitation and snowfall for each month, 1991-2020.
| Month | High °F | Low °F | Precip in | Snow in | Range |
|---|---|---|---|---|---|
| January | 37.8 | 24.7 | 1.24 | 5.1 | 24.7 to 37.8 degrees |
| February | 44.7 | 28.3 | 0.99 | 2.8 | 28.3 to 44.7 degrees |
| March | 54.6 | 34.4 | 1.39 | 1.3 | 34.4 to 54.6 degrees |
| April | 62.3 | 39.3 | 1.23 | 0.3 | 39.3 to 62.3 degrees |
| May | 71.6 | 46.5 | 1.39 | 0 | 46.5 to 71.6 degrees |
| June | 81.3 | 53.7 | 0.69 | 0 | 53.7 to 81.3 degrees |
| July | 91.2 | 60.4 | 0.33 | 0 | 60.4 to 91.2 degrees |
| August | 89.7 | 59.6 | 0.24 | 0 | 59.6 to 89.7 degrees |
| September | 78.8 | 51 | 0.58 | 0 | 51 to 78.8 degrees |
| October | 64.8 | 40.9 | 0.75 | 0.1 | 40.9 to 64.8 degrees |
| November | 48.2 | 31.9 | 1.35 | 2.6 | 31.9 to 48.2 degrees |
| December | 37.5 | 24 | 1.55 | 7 | 24 to 37.5 degrees |
Source: NOAA NCEI, U.S. Climate Normals 1991-2020 — station USW00024131, Boise Air Terminal · rates as published for 1991-2020 normals
How to read Boise climate normals
What a climate normal is, and what it is not.
A normal is the average of thirty years of daily observations at one station — here Boise Air Terminal, 6 km from the centre of Boise. It describes a typical year, so any single year will run warmer, cooler, wetter or drier. Readings taken at an airport on the edge of town usually sit a degree or two below a dense downtown on summer nights. Boise sees about 47.5 days a year at or above 90°F and about 38.9 days with a tenth of an inch of precipitation or more.
Keep going
Other Boise data on this site.