Idaho climate

World Climates covers 2 places in Idaho. By annual mean temperature, the warmest is Boise (12 °C54 °F) and the coolest is Pocatello (9 °C49 °F). The wettest is Pocatello with 411 mm16 in of precipitation per year, the driest Boise with 389 mm15 in.

The most common climate types (Köppen classification computed from these averages) are hot-summer continental (dry summer) (Dsa, 2 places).

The highest monthly average high is in Boise (35 °C95 °F in July); the lowest monthly average low is in Pocatello (−9 °C15 °F in January).

Temperature and rainfall across Idaho

Annual mean temperatures in Idaho range from 9 °C49 °F to 12 °C54 °F. The typical place (the median of all 2) has a year average of 11 °C51 °F. Annual precipitation ranges from 389 mm15 in to 411 mm16 in. The median place receives about 400 mm16 in in an average year.

In 2 places of 2, the coldest month has an average low below 0 °C (32 °F). In 2 places, the warmest month has an average high above 30 °C (86 °F). No place here gets less than 250 mm (10 in) of precipitation a year. None gets more than 2,000 mm (79 in) a year.

Averaged over all 2 places, July is the warmest month, with a mean of 26 °C79 °F. January is the coldest, with −2 °C28 °F. The wettest month on average is December (55 mm2.2 in). The driest is July (10 mm0.4 in). Single places can differ a lot from this average, so check the page of each city.

The table below lists the places sorted by population. The largest ones covered here are Boise and Pocatello. Each city page has a chart and a table for every month. It also shows the best time to visit and what to pack. The figures are 25-year averages for 2001–2025 from NASA POWER. They describe grid cells of roughly 50–70 km, not single weather stations.

Climate of each place in Idaho

Boise has a hot-summer continental (dry summer) climate (Köppen Dsa). Its year average is 12 °C54 °F. The warmest month is July, with an average high of 35 °C95 °F. The coldest is January, with an average low of −4 °C25 °F. About 389 mm15 in of precipitation falls in a year. December is the wettest month and July the driest. By our comfort score, the best months to visit are May and June and September and October.

Pocatello has a hot-summer continental (dry summer) climate (Köppen Dsa). Its year average is 9 °C49 °F. The warmest month is July, with an average high of 33 °C92 °F. The coldest is January, with an average low of −9 °C15 °F. About 411 mm16 in of precipitation falls in a year. May is the wettest month and July the driest. By our comfort score, the best months to visit are May and June and September.

Frequently asked questions

Which is the warmest place in Idaho?

By annual mean temperature, the warmest place in Idaho is Boise at 12 °C54 °F. The coolest is Pocatello at 9 °C49 °F.

Where does it rain the most in Idaho?

Pocatello gets the most precipitation, 411 mm16 in in an average year. The driest place is Boise with 389 mm15 in.

How many places in Idaho does this site cover?

World Climates has climate data for 2 places in Idaho. Each one has a page with monthly averages for temperature, rainfall, humidity and daylight.