Average December Weather in Delaware

Typical temperatures, precipitation, snowfall, humidity and sunshine during December at cities and towns throughout Delaware are listed below.

Temperatures in Delaware for December

This table gives the averages in degrees Fahrenheit and Celsius for maximum and minimum monthly temperatures. These normal temperatures are based on weather data collected from 1991 to 2020 for the US National Centers for Environmental Information.

Average December temperatures
High °F Low °F Place High °C Low °C
49 32 Dover 9 0
50 33 Georgetown 10 0
48 29 Greenwood 9 -2
50 35 Lewes 10 2
47 30 Newark 8 -1
46 30 Wilmington 8 -1

Precipitation in Delaware for December

Here are the December averages for rainfall plus snowfall in Delaware. Each place has a total for how many days of wet weather it usually gets this month and for the normal amount of precipitation, based on the weather during 1991 to 2020. The calculation of days only includes those when precipitation totalled 0.01 inches (0.25 millimetres) or more.

Average precipitation in December
Days Place Inches Milli­metres
10 Dover 4.0 101
10 Georgetown 3.5 88
10 Greenwood 3.8 96
12 Lewes 4.2 106
10 Newark 4.0 103
11 Wilmington 3.9 98

Snowfall in Delaware for December

Listed here are the totals for amount of snow and how many days it snows at least 0.1 inches (0.25 centimetres) in Delaware. The numbers are this month's averages of snowfall measurements made during 1991 to 2020.

Average total snowfall in December
Days Place Inches Centi­metres
0.8 Dover 2.6 6.6
1.0 Greenwood 1.8 4.6
0.4 Lewes 1.0 2.5
1.7 Wilmington 2.9 7.4

Sunshine in Delaware for December

In the table below, the average number of Sunny Days in Delaware is the total days this month when the sky is mostly clear. This includes the days when cloud covers up to 30% of the sky during daylight hours.

Partly Sunny Days have cloud covering from 40% to 70% of the sky during the daytime. The rest of the days during December are mainly overcast, with at least 80% cloud cover. Total Days With Sun is a sum of the Sunny plus Partly Sunny days. These numbers are averages of most the years the weather station has operated.

Days of sunshine in December
City Sunny Partly Sunny Total Days
With Sun
Wilmington 8 7 15

Humidity in Delaware

In the table below, the Daily number is the average of relative humidity readings taken every three hours throughout the day. Morning percentages are for 7 am and Afternoon levels are for 4 pm local standard time. All the humidity numbers are averages for the years 1961 to 1990.

Average December humidity (%)
Daily City Morning Afternoon
69 Wilmington 76 59
References

National Climatic Data Center. Comparative Climatic Data.

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

World Data Center for Meteorology. Climate of the World.

More Delaware Weather Information

Delaware Weather
Back to Top