Climate in Idaho
(United States)

Average daytime and nighttime temperatures

All climate diagrams on this site result from the collected data from nine measuring weather stations in Idaho.
Weather stations at an altitude above 1690m have not been included.
All data correspond to the average monthly values of the last 20 years.

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Idaho is one of the coldest regions in the United States of America with an average daily high temperature of only 15 degrees. The climate is varied and offers seasons with strong winters and warm summers.
Overview: Climate in the United States of America
Daylengths and sun positions in the United States of America
Compare climate with other regions or countries
Sunshine hours per day
The number of hours of sunshine refers to the time when the sun is actually visible. That is, without any obstruction of visibility by clouds, fog or mountains. With 12 hours per day, July is the sunniest month in the state of Idaho. In December, the sun shines the least.
Rain days per month
A rain day is a day on which at least 0.1 mm precipitation (=0.1 liter) per square meter falls. This can be rain, snow, hail or even dew. So it does not have to rain the whole day. With 8 rain days, May offers the most rain days, while July has the fewest.
Precipitation amount in mm/day
The amount of precipitation is measured in millimeters per square meter. Thus, at two mm/day, two liters of water fall on one square meter within 24 hours. With only 0.5 mm, the least amount of rain falls in July. June, on the other hand, has the most rain.
Relative humidity in %
Warm air can absorb more moisture than cold air. The relative humidity indicates how much moisture can be physically contained in the air. At high humidity, a person feels uncomfortable and perceives this as oppressive. In general, a relative humidity of 40-60% feels pleasant. With humidity averaging 72%, December is the most uncomfortable. In July, on the other hand, it is easier to endure.
Absolute humidity in g/m³
In warm months, there is also a higher absolute humidity almost everywhere. At a temperature of 25°C, air can absorb up to 23 grams of water per cubic meter. At 20°C, it is only 17.3 grams. A relative humidity of 40% at 25°C thus corresponds to an absolute humidity of 9.2 grams of water. From a proportion of approx. 13.5 grams, humans perceive the air as muggy.
The "Humidex" (humidity index) is an index of well-being in warmer areas, calculated from the air temperature, relative humidity and dew point. The index corresponds approximately to the temperature felt. At high temperatures, the body transports heat away by sweating. At high humidity, the ambient air can only absorb a small amount of sweat and thus one feels uncomfortable. An index of 20-29 is considered comfortable. Up to 39, people perceive the air as slightly uncomfortable, and above 40, as very uncomfortable. Values above 45 are dangerous in the long run and often lead to heat stroke.
Map of Idaho

Most important cities in the federal state »Idaho«

The federal state has a west-east extension of about 410 km and over 690 km from north to south.

CityPopulationGeo position
Boise223,15443° 36' 49"N116° 12' 12"W
Nampa81,55743° 32' 27"N116° 33' 48"W
Meridian75,09243° 36' 44"N116° 23' 29"W
Idaho Falls56,81343° 27' 60"N112° 2' 3"W
Pocatello54,25542° 52' 17"N112° 26' 44"W
Caldwell46,23743° 39' 47"N116° 41' 14"W
Coeur d'Alene44,13747° 40' 40"N116° 46' 50"W
Twin Falls44,12542° 33' 47"N114° 27' 39"W
Lewiston31,89446° 24' 60"N117° 1' 4"W
Lewiston Orchards31,42246° 22' 50"N116° 58' 32"W
Post Falls27,57447° 43' 5"N116° 57' 6"W
Rexburg25,48443° 49' 34"N111° 47' 23"W
Moscow23,80046° 43' 57"N117° 0' 1"W
Eagle19,90843° 41' 44"N116° 21' 14"W
Kuna15,21043° 29' 31"N116° 25' 12"W
Mountain Home14,20643° 7' 59"N115° 41' 28"W
Chubbuck13,92242° 55' 15"N112° 27' 58"W
Ammon13,81643° 28' 11"N111° 57' 60"W
Hayden13,29447° 45' 58"N116° 47' 12"W
Blackfoot11,89943° 11' 26"N112° 20' 42"W
Garden City10,97243° 37' 20"N116° 14' 17"W
Jerome10,89042° 43' 27"N114° 31' 7"W
Burley10,34542° 32' 9"N113° 47' 34"W
Hailey7,96043° 31' 11"N114° 18' 55"W
Payette7,43344° 4' 42"N116° 56' 2"W
Sandpoint7,36548° 16' 36"N116° 33' 12"W
Rathdrum6,82647° 48' 45"N116° 53' 48"W
Emmett6,55743° 52' 25"N116° 29' 57"W
Star5,79343° 41' 32"N116° 29' 36"W
Rupert5,55442° 37' 9"N113° 40' 38"W

Data basis: German Weather Service, individual values averaged and supplemented by own elements. Data on cities and inhabitants:, United Nations Statistics Division and own research.
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