Average Temperatures and Rainfall for Idaho

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).

What is the warmest or hottest month in Idaho?

July is the hottest or warmest month in Idaho, with an average maximum temperate of 31°C/88°F.

What is the coldest or coolest month in Idaho?

January is the coolest or coldest month in Idaho, with an average minimum temperate of -6°C/21°F.

What is the most rainy or wettest month in Idaho?

March is the wettest or most rainy month in Idaho, with an average rainfall of 48mm/2 inches.

What is the least rainy or driest month in Idaho?

July is the driest or least rainy month in Idaho, with an average rainfall of 10mm/0 inches.

What is the warmest or hottest place in Idaho?

Caldwell is the hottest or warmest place in Idaho, with an average maximum temperate of 12°C/54°F.

What is the coldest place in Idaho?

Pocatello is the coldest place in Idaho, with an average maximum temperate of 6°C/43°F.

What is the most rainy or wettest place in Idaho?

Pocatello is the most rainy or wettest place in Idaho, with an average annual rainfall of 836mm/33 inches.

What is the least rainy or driest place in Idaho?

Caldwell is the least rainy or driest place in Idaho, with an average annual rainfall of 220mm/9 inches.

Average Monthly Temperatures
Average Maximum Temperature Average Minimum Temperature
Average Monthly Rainfall
PlaceMin TempMax TempAvg TempRainfall
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