Humidity Levels in California During December

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The average humidity in December is listed below for places in California. 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
Southern California
76 Bakersfield 86 62
66 Long Beach 75 52
63 Los Angeles 67 60
64 San Diego 68 58
68 Santa Barbara 76 56
71 Santa Maria 80 58
Northern California
84 Fresno 92 69
83 Sacramento 90 70
78 San Francisco 85 67
84 Stockton 91 71


Highest and Lowest Humidity

Below are the averages during December for maximum and minimum humidity levels in California. 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
Southern California
86.0 7 am Bakersfield 61.6 4 pm
76.8 4 am Long Beach 46.1 1 pm
68.8 4 am Los Angeles 49.4 1 pm
70.9 1 am San Diego 50.1 1 pm
76.2 4 am Santa Barbara 51.8 1 pm
84.5 1 am Santa Maria 47.4 1 pm
Northern California
92.4 7 am Fresno 69.0 4 pm
90.1 7 am Sacramento 70.0 4 pm
85.3 7 am San Francisco 67.1 4 pm
90.5 7 am Stockton 71.1 4 pm
Reference

World Data Center for Meteorology. Climate of the World.

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