Rainy days · Idaho
How often does it rain in Boise?
Boise gets its wet days in winter and then spends the summer bone dry and proud of it.
Boise gets measurable rain or snow on about 89 days a year, adding up to about 11 inches.
November usually brings Boise about 10 wet days and 1.2 inches. The wettest month is usually December, with about 12 wet days, and the driest is August, with about 2 wet days. That makes Boise number 104 of the 129 US cities we track, rainiest first.
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Rainy days, month by month
| Month | Wet days | Inches |
|---|---|---|
| January | 11 | 1.4 |
| February | 9 | 1.0 |
| March | 10 | 1.3 |
| April | 9 | 1.2 |
| May | 8 | 1.4 |
| June | 5 | 0.8 |
| July | 2 | 0.2 |
| August | 2 | 0.2 |
| September | 4 | 0.4 |
| October | 6 | 0.8 |
| November | 10 | 1.2 |
| December | 12 | 1.5 |
Cities with about as many rainy days
- Honolulu, Hawaii: about 89 wet days a year
- Casper, Wyoming: about 91 wet days a year
- Wichita, Kansas: about 87 wet days a year
Source: NOAA daily precipitation records for the Boise area, 1991 to 2020 (at least 30 complete years behind every month), via the Applied Climate Information System. A wet day here means at least a hundredth of an inch of rain or melted snow.