Climate of Idaho, USA
Area-weighted average across Idaho. For where people actually live and travel, see the cities below.
Idaho, a subdivision of United States of America, has a seasonal climate on average. Area-weighted monthly temperatures across the whole territory range from -5.3°C / 22.5°F in January to 17.4°C / 63.3°F in July, with rainfall from 22 mm / 0.9 in to 54 mm / 2.1 in depending on the season (474 mm / 18.7 in total across the year). See the city listed below for point-value climate at specific locations — these often differ from the area-weighted average, especially in geographically diverse subdivisions.
| Month | Temperature | Rainfall | Matches |
|---|---|---|---|
| January | -5.3°C22.5°F | 54 mm2.1″ | Snowy |
| February | -3.2°C26.2°F | 41 mm1.6″ | Snowy |
| March | 0.3°C32.5°F | 41 mm1.6″ | Snowy |
| April | 4.2°C39.6°F | 36 mm1.4″ | — |
| May | 8.8°C47.8°F | 46 mm1.8″ | — |
| June | 13.2°C55.8°F | 43 mm1.7″ | — |
| July | 17.4°C63.3°F | 22 mm0.9″ | Sunny & Mild |
| August | 17.3°C63.1°F | 25 mm1″ | Sunny & Mild |
| September | 12.6°C54.7°F | 30 mm1.2″ | — |
| October | 6.8°C44.2°F | 33 mm1.3″ | — |
| November | -0.1°C31.8°F | 50 mm2″ | Snowy |
| December | -4.9°C23.2°F | 53 mm2.1″ | Snowy |
Frequently asked questions
What is the best time to visit Idaho?
The best months to visit Idaho, United States of America for sunny, dry weather are July, August. The warmest month is July at an area-wide average of 17.4°C / 63.3°F, and the driest is July with about 22 mm / 0.9 in of rainfall.
What is the climate of Idaho?
Idaho, United States of America has area-weighted monthly average temperatures ranging from -5.3°C / 22.5°F in January to 17.4°C / 63.3°F in July. Annual rainfall averages about 474 mm / 18.7 in, with the wettest month being January (54 mm / 2.1 in) and the driest July (22 mm / 0.9 in). Because this is an area average across the whole subdivision, local city values can differ substantially.
What is the hottest month in Idaho?
The hottest month in Idaho is July, with an area-wide average temperature of 17.4°C / 63.3°F.
What is the coldest month in Idaho?
The coldest month in Idaho is January, with an area-wide average temperature of -5.3°C / 22.5°F.
When does it rain most in Idaho?
The wettest month in Idaho is January, averaging about 54 mm / 2.1 in of rainfall. The driest is July with about 22 mm / 0.9 in.