Humidity Levels in Pennsylvania During December

The average humidity in December is listed below for places in Pennsylvania. 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
71 Allentown 78 63
75 Erie 77 73
66 Harrisburg 72 58
68 Philadelphia 74 60
72 Pittsburgh 77 66
73 Wilkes-Barre & Scranton 77 66
72 Williamsport 78 63

Highest and Lowest Humidity

Below are the averages during December for maximum and minimum humidity levels in Pennsylvania. 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
78.0 7 am Allentown 62.7 1 pm
76.7 7 am Erie 72.3 1 pm
72.0 7 am Harrisburg 58.0 4 pm
74.4 7 am Philadelphia 58.9 1 pm
76.6 7 am Pittsburgh 65.7 4 pm
77.3 7 am Wilkes-Barre & Scranton 65.6 4 pm
77.8 7 am Williamsport 62.8 4 pm
Reference

World Data Center for Meteorology. Climate of the World.

Pennsylvania Humidity
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