Dover
Delaware, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Dover, DE

The public Archives building in Dover, Delaware, between two large trees
The public Archives building in Dover, Delaware, between two large trees
December, the first month of the winter, in Dover, is still a chilly month, with average temperature ranging between min 35.6°F (2°C) and max 46.2°F (7.9°C).

Temperature

In December, the average high-temperature slightly decreases, from a cool 54.3°F (12.4°C) in November, to a frosty 46.2°F (7.9°C). In December, the average low-temperature is 35.6°F (2°C).

Humidity

In Dover, Delaware, the average relative humidity is 76%.

Rainfall

In Dover, during December, the rain falls for 10.5 days and regularly aggregates up to 2.09" (53mm) of precipitation. In Dover, during the entire year, the rain falls for 152.3 days and collects up to 26.3" (668mm) of precipitation.

Snowfall

January through March and December are months with snowfall. December is the first month it typically snows in Dover, Delaware. Throughout December, in the average 1.7 snowfall days, it receives 0.51" (13mm) of snow. Throughout the year, there are 10.1 snowfall days, and 4.61" (117mm) of snow is accumulated.

Daylight

The month with the shortest days in Dover is December, with an average of 9.5h of daylight.

Sunshine

The average sunshine in December is 5.2h.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from the exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 2 interpret into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in December in Dover?

In December, in Dover, the average high-temperature is 46.2°F (7.9°C), and the average low-temperature is 35.6°F (2°C).

What is the average humidity in December in Dover?

In Dover, Delaware, the average relative humidity in December is 76%.

How much does it rain in Dover in December?

In December, in Dover, Delaware, the rain falls for 10.5 days. Throughout December, 2.09" (53mm) of precipitation is accumulated.

When does it start snowing in Dover?

December is the first month it typically snows in Dover, Delaware. Throughout December, in the average 1.7 snowfall days, it receives 0.51" (13mm) of snow.

What is the month with the shortest days in Dover?

December has the shortest days of the year, with an average of 9.5h of daylight.

What is the average length of the day in December in Dover?

In Dover, the average length of the day in December is 9.5h.

How long on average sun shines in December in Dover?

In December, the average sunshine in Dover is 5.2h.

What are the months with the lowest UV index in Dover?

Months with the lowest UV index are January and December, with an average maximum UV index of 2.

How high is the UV index in December in Dover?

The average daily maximum UV index in December in Dover is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to the UV radiation.
Average temperature in December - Dover, DE
  • Average high temperature in December: 7.9°C

The warmest month (with the highest average high temperature) is July (29°C).
The month with the lowest average high temperature is January (4.3°C).

  • Average low temperature in December: 2°C

The month with the highest average low temperature is July (21.1°C).
The coldest month (with the lowest average low temperature) is January (-1.8°C).

Average humidity in December - Dover, DE
  • Average humidity in December: 76%

The month with the highest relative humidity is May (79%).
Months with the lowest relative humidity are January, March, April and November (74%).

Average rainfall in December - Dover, DE
  • Average rainfall in December: 53mm

The wettest month (with the highest rainfall) is August (80mm).
The driest month (with the lowest rainfall) is January (37mm).

Average rainfall days in December - Dover, DE
  • Average rainfall days in December: 10.5 days

The month with the highest number of rainy days is July (17.6 days).
The month with the lowest number of rainy days is November (8.1 days).

Average snowfall in December - Dover, DE
  • Average snowfall in December: 13mm

The month with the highest snowfall is January (42mm).
Months with the lowest snowfall are April, May, June, July, August, September, October and November (0mm).

Average snowfall days in December - Dover, DE
  • Average snowfall days in December: 1.7 days

The month with the highest number of snowfall days is January (3.5 days).
Months with the lowest number of snowfall days are April, May, June, July, August, September, October and November (0 days).

Average daylight in December / Average sunshine in December - Dover, DE
  • Average daylight in December: 9.5h

The month with the longest days is June (Average daylight: 14.9h).
The month with shortest days is December (Average daylight: 9.5h).

  • Average sunshine in December: 5.2h

The month with most sunshine is July (Average sunshine: 10.8h).
The month with least sunshine is February (Average sunshine: 5h).

Average UV index in December - Dover, DE
  • Average UV index in December: 2

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January and December (UV index 2).