Average Weather in Delaware

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Annual average temperatures, precipitation, snowfall, humidity and sunshine at cities and towns throughout Delaware are listed below.

Delaware Temperatures

This table gives the averages in degrees Fahrenheit and Celsius for maximum and minimum yearly temperatures. These normal temperatures are based on weather data collected from 1981 to 2010 for the NOAA National Climatic Data Center.

Average annual temperatures
High °F Low °F Place High °C Low °C
66 47 Dover 19   9
66 47 Georgetown 19   8
67 50 Lewes 19 10
66 45 Milford 19   7
67 45 Newark 19   7
64 46 Wilmington 18   8

Delaware Precipitation

Here are the yearly averages for rainfall plus snowfall in Delaware. Each place has a total for how many days of wet weather it usually gets in a year and for the normal amount of precipitation, based on the weather during 1981 to 2010. The calculation of days only includes those when precipitation totalled 0.01 inches (0.25 millimetres) or more.

Average total precipitation for a year
Days Place Inches Millimetres
113 Dover 46.1 1170
114 Georgetown 45.9 1167
116 Lewes 46.8 1190
108 Newark 46.2 1174
118 Wilmington 43.1 1094

Annual Snowfall in Delaware

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 annual averages of snowfall measurements made during 1981 to 2010.

Average total snowfall
Days Place Inches Centimetres
  5.3 Dover 15.7 39.9
  5.2 Georgetown 13.2 33.5
  3.0 Lewes   9.6 24.4
  3.2 Newark   7.8 19.8
11.8 Wilmington 20.2 51.3

Annual Sunshine in Delaware

In the table below, the average number of Sunny Days in Delaware is the total days in a year 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 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
City Sunny Partly Sunny Total Days
With Sun
Wilmington 97 104 201

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 annual relative humidity (%)
Daily City Morning Afternoon
68 Wilmington 78 54
References

National Climatic Data Center. Comparative Climatic Data.

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

World Data Center for Meteorology. Climate of the World.

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