Annual Average Humidity in Idaho

The average humidity year round is listed below for places in Idaho. The tables give daily averages along with highest and lowest relative humidity levels.

Relative humidity measures the actual amount of moisture in the air as a percentage of the maximum amount of moisture the air can hold.

All the numbers here are averages for the years 1961 to 1990.

Average Humidity

In this table, the Daily number is the average of humidity readings taken every three hours throughout the day. Morning percentages are at 7 am for Lewiston and 8 am for Boise and Pocatello. Afternoon readings are at 4 pm for Lewiston and 5 pm for Boise and Pocatello, local standard time.

Average yearly relative humidity (%)
Daily Place Morning Afternoon
55 Boise 64 41
Lewiston 71 47
58 Pocatello 66 44

Highest and Lowest Humidity

Below are averages over the year for maximum and minimum humidity levels in Idaho. The hours when the highest and lowest humidity readings usually occur are given in local standard time.

Annual averages for daily high and low relative humidity (%)
High Time Place Low Time
68.1 5 am Boise 41.4 5 pm
74.2 4 am Lewiston 47.0 4 pm
71.8 5 am Pocatello 43.7 2 pm

World Data Center for Meteorology. Climate of the World.

Idaho Humidity
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