Average annual temperatures for Idaho (9°C/48°F) are slightly below the average for United States (13°C/55°F).
Average annual rainfall for Idaho (399mm/16 inches) is significantly below the average for United States (1,039mm/41 inches).
July is the hottest or warmest month in Idaho, with an average maximum temperate of 31°C/88°F.
January is the coolest or coldest month in Idaho, with an average minimum temperate of -6°C/21°F.
March is the wettest or most rainy month in Idaho, with an average rainfall of 48mm/2 inches.
July is the driest or least rainy month in Idaho, with an average rainfall of 10mm/0 inches.
Caldwell is the hottest or warmest place in Idaho, with an average maximum temperate of 12°C/54°F.
Pocatello is the coldest place in Idaho, with an average maximum temperate of 6°C/43°F.
Pocatello is the most rainy or wettest place in Idaho, with an average annual rainfall of 836mm/33 inches.
Caldwell is the least rainy or driest place in Idaho, with an average annual rainfall of 220mm/9 inches.
| Place | Min Temp | Max Temp | Avg Temp | Rainfall |
|---|---|---|---|---|
| Boise | 1 | 16 | 8 | - |
| Caldwell | 4 | 20 | 12 | 220 |
| Idaho Falls | 0 | 15 | 7 | 282 |
| Meridian | 6 | 18 | 12 | 339 |
| Nampa | 6 | 18 | 12 | 339 |
| Pocatello | 0 | 12 | 6 | 836 |