December weather forecast and climate
Dover, NJ

Weather in December

The first month of the winter, December, is still a cold month in Dover, New Jersey, with average temperature fluctuating between 40.1°F (4.5°C) and 28.6°F (-1.9°C).

Temperature

In Dover, the average high-temperature drops, from a frosty 49.3°F (9.6°C) in November, to a cold 40.1°F (4.5°C). The average low-temperature, in December, is 28.6°F (-1.9°C).

Humidity

Months with the highest humidity are February, October and December, with an average relative humidity of 81%.

Rainfall

In Dover, during December, the rain falls for 5.5 days and regularly aggregates up to 0.71" (18mm) of precipitation. In Dover, during the entire year, the rain falls for 81.9 days and collects up to 6.69" (170mm) of precipitation.

Snowfall

Months with snowfall in Dover are January through May, October through December. In December, it is snowing for 2.5 days. Throughout December, 0.47" (12mm) of snow is accumulated. In Dover, during the entire year, snow falls for 18.1 days, and aggregates up to 2.68" (68mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9.3h of daylight.

Sunshine

In Dover, New Jersey, the average sunshine in December is 4.7h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Dover. A UV Index value of 2, and less, symbolizes a low threat to health from the exposure to the Sun's UV rays for average individuals.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in December in Dover?

The average high-temperature, in December, is 40.1°F (4.5°C), while the average low-temperature is 28.6°F (-1.9°C).

What are the most humid months in Dover?

Months with the highest humidity in Dover are February, October and December, with an average relative humidity of 81%.

What is the average humidity in December in Dover?

In December, the average relative humidity in Dover, New Jersey, is 81%.

How many days does it rain in December in Dover?

In Dover, New Jersey, during December, the rain falls for 5.5 days and regularly aggregates up to 0.71" (18mm) of precipitation.

How much does it snow in Dover in December?

In Dover, in December, snow falls for 2.5 days, with typically accumulated 0.47" (12mm) of snow.

What is the month with the shortest days in Dover?

December has the shortest days of the year in Dover, with an average of 9.3h of daylight.

How many hours of daylight does Dover have in December?

In Dover, the average length of the day in December is 9.3h.

How long on average sun shines in December in Dover?

In Dover, New Jersey, the average sunshine in December is 4.7h.

When is the lowest UV index in Dover?

Months with the lowest UV index in Dover, New Jersey, are January through March, November and December, with an average maximum UV index of 2.

How high is the UV index in December in Dover?

In December, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from the exposure to the Sun's UV radiation.

Average temperature in December
Dover, NJ

Average temperature in December - Dover, NJ
  • Average high temperature in December: 40.1°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (34.3°F).

  • Average low temperature in December: 28.6°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).

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Average pressure in December
Dover, NJ

Average pressure in December - Dover, NJ
  • Average pressure in December: 30.08"

The month with the highest atmospheric pressure is November (30.11").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in December
Dover, NJ

Average wind speed in December - Dover, NJ
  • Average wind speed in December: 7.4mph

The windiest month (with the highest average wind speed) is March (8.2mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

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Average humidity in December
Dover, NJ

Average humidity in December - Dover, NJ
  • Average humidity in December: 81%

Months with the highest relative humidity are February, October and December (81%).
The month with the lowest relative humidity is April (75%).

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Average rainfall in December
Dover, NJ

Average rainfall in December - Dover, NJ
  • Average rainfall in December: 0.71"

The wettest month (with the highest rainfall) is July (0.79").
The driest month (with the least rainfall) is September (0.16").

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Average rainfall days in December
Dover, NJ

Average rainfall days in December - Dover, NJ
  • Average rainfall days in December: 5.5 days

The month with the highest number of rainy days is July (9.5 days).
The month with the least rainy days is February (4 days).

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Average snowfall in December
Dover, NJ

Average snowfall in December - Dover, NJ
  • Average snowfall in December: 0.47"

The month with the highest snowfall is March (0.79").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Dover, NJ

Average snowfall days in December - Dover, NJ
  • Average snowfall days in December: 2.5 days

The month with the highest number of snowfall days is February (5.3 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Dover, NJ

Average daylight in December / Average sunshine in December - Dover, NJ
  • Average daylight in December: 9.3h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in December: 4.7h

The month with the most sunshine is July (Average sunshine: 10.2h).
The month with the least sunshine is February (Average sunshine: 4.4h).

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Average sunshine days in December
Dover, NJ

Average sunshine days in December - Dover, NJ
  • Average sunshine days in December: 24.1 days

The month with the most sunshine days is November (24.5 days).
The month with the least sunshine days is July (18.3 days).

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Average UV index in December
Dover, NJ

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

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in December
Dover, NJ

Average cloud cover in December - Dover, NJ
  • Average cloud cover in December: 50

Months with the most cloud cover are February and March (Cloud cover 51).
Months with the least cloud cover are July and August (Cloud cover 36).

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Average visibility in December
Dover, NJ

Average visibility in December - Dover, NJ
  • Average visibility in December: 6mi

Months with the highest visibility are January, March, April, November and December (6mi).
Months with the lowest visibility are February, May, June, July, August, September and October (5mi).

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