Humidity Levels in Oregon During December

The average humidity in December is listed below for places in Oregon. 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
84 Astoria 86 80
89 Eugene 92 83
87 Medford 91 76
78 Pendleton 80 76
83 Portland 86 78
85 Salem 88 80

Highest and Lowest Humidity

Below are the averages during December for maximum and minimum humidity levels in Oregon. 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
86.2 7 am Astoria 79.0 1 pm
91.8 4 am Eugene 82.3 1 pm
91.3 7 am Medford 76.0 4 pm
80.4 7 am Pendleton 73.0 1 pm
86.1 7 am Portland 77.1 1 pm
88.1 7 am Salem 78.9 1 pm

World Data Center for Meteorology. Climate of the World.

Oregon Humidity
Back to Top