Annual Average Humidity in Montana

The average humidity year round is listed below for places in Montana. 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 for 8 am and Afternoon measures are for 5 pm local standard time.

Average yearly relative humidity (%)
Daily Place Morning Afternoon
55 Billings 63 44
62 Glasgow 69 50
55 Great Falls 61 45
57 Helena 66 45
68 Kalispell 76 54
61 Miles City 68 49
68 Missoula 79 52

Highest and Lowest Humidity

Below are averages over the year for maximum and minimum humidity levels in Montana. 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
65.6 5 am Billings 42.0 2 pm
74.8 8 am Glasgow 48.4 2 pm
66.3 5 am Great Falls 43.1 2 pm
70.8 5 am Helena 43.0 2 pm
81.4 5 am Kalispell 53.0 2 pm
73.9 5 am Miles City 47.1 2 pm
82.8 5 am Missoula 52.0 2 pm
Reference

World Data Center for Meteorology. Climate of the World.

Montana Humidity
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