Humidity Levels in Washington During December

The average humidity in December is listed below for places in Washington. 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 7 am and Afternoon measures are for 4 pm local standard time.

Average relative humidity (%) in December
Daily Place Morning Afternoon
89 Olympia 92 84
90 Quillayute 92 86
80 Seattle 83 77
86 Spokane 88 82
80 Yakima 84 74

Highest and Lowest Humidity

Below are the averages during December for maximum and minimum humidity levels in Washington. The hours when this month's highest and lowest humidity readings usually occur are given in local standard time.

Daily high and low relative humidity (%) averages in December
High Time Place Low Time
91.9 4 am Olympia 83.7 1 pm
92.0 7 am Quillayute 85.3 1 pm
82.8 7 am Seattle 76.4 1 pm
87.8 7 am Spokane 80.9 1 pm
83.6 7 am Yakima 71.4 1 pm

World Data Center for Meteorology. Climate of the World.

Washington Humidity
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