December weather forecast
Chester, MD

Weather in December

December, the first month of the winter in Chester, is still a chilly month, with an average temperature ranging between min 36.3°F (2.4°C) and max 46.2°F (7.9°C).

Temperature

In December, the average high-temperature marginally drops from a cool 54.5°F (12.5°C) in November to a frosty 46.2°F (7.9°C). In Chester, Maryland, the average low-temperature is 36.3°F (2.4°C).

Humidity

The average relative humidity in December is 76%.

Rainfall

In December, the rain falls for 11.4 days. Throughout December, 2.91" (74mm) of precipitation is accumulated. In Chester, during the entire year, the rain falls for 159 days and collects up to 32.36" (822mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December. In December, in Chester, Maryland, it is snowing for 1.7 days. Throughout December, 0.31" (8mm) of snow is accumulated. Throughout the year, in Chester, there are 11.4 snowfall days, and 4.13" (105mm) of snow is accumulated.

Ocean temperature

In December, the average ocean temperature in Chester, Maryland, is 51.6°F (10.9°C).
Note: Swimming in 51.6°F (10.9°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

With an average of 9h and 29min of daylight, December has the shortest days of the year in Chester.
On the first day of the month, sunrise is at 7:05 am and sunset at 4:43 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:52 pm EST.

Sunshine

In Chester, Maryland, the average sunshine in December is 5.2h.

UV index

The months with the lowest UV index are January and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in December in Chester?

In Chester, Maryland, the average relative humidity in December is 76%.

How many days does it rain in December in Chester?

In December, in Chester, Maryland, the rain falls for 11.4 days. Throughout December, 2.91" (74mm) of precipitation is accumulated.

How many days does it snow in December in Chester?

In December, in Chester, Maryland, it is snowing for 1.7 days. Throughout December, 0.31" (8mm) of snow is accumulated.

What is the ocean temperature in December in Chester?

In Chester, Maryland, the average seawater temperature in December is 51.6°F (10.9°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the month with the shortest days in Chester?

With an average of 9h and 29min of daylight, December has the shortest days of the year.

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

In December, the average day length in Chester is 9h and 29min.

What time are sunrise and sunset in December in Chester?

On the first day of December in Chester, Maryland, sunrise is at 7:05 am and sunset at 4:43 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:52 pm EST.

How long on average sun shines in December in Chester?

In Chester, the average sunshine duration in December is 5.2h.

What is the month with the lowest UV index in Chester?

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

What is the UV index intensity in December in Chester?

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

Average temperature in December
Chester, MD

Average temperature in December - Chester, MD
  • Average high temperature in December: 46.2°F

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (40.1°F).

  • Average low temperature in December: 36.3°F

The month with the highest average low temperature is July (71.2°F).
The coldest month (with the lowest average low temperature) is January (29.5°F).

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Average pressure in December
Chester, MD

Average pressure in December - Chester, MD
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed in December
Chester, MD

Average wind speed in December - Chester, MD
  • Average wind speed in December: 9.2mph

The windiest months (with the highest average wind speed) are February and March (10.1mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).

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Average humidity in December
Chester, MD

Average humidity in December - Chester, MD
  • Average humidity in December: 76%

The month with the highest relative humidity is May (79%).
The months with the lowest relative humidity are January and November (73%).

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Average rainfall in December
Chester, MD

Average rainfall in December - Chester, MD
  • Average rainfall in December: 2.91"

The wettest month (with the highest rainfall) is July (3.31").
The driest month (with the least rainfall) is September (1.89").

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Average rainfall days in December
Chester, MD

Average rainfall days in December - Chester, MD
  • Average rainfall days in December: 11.4 days

The month with the highest number of rainy days is May (18.1 days).
The month with the least rainy days is November (8.8 days).

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Average snowfall in December
Chester, MD

Average snowfall in December - Chester, MD
  • Average snowfall in December: 0.31"

The month with the highest snowfall is January (1.42").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Chester, MD

Average snowfall days in December - Chester, MD
  • Average snowfall days in December: 1.7 days

The month with the highest number of snowfall days is January (4.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in December
Chester, MD

Average sea temperature in December - Chester, MD
  • Average sea temperature in December: 51.7°F

The best month for swimming (with the highest average sea temperature) is August (77.8°F).
The coldest month (with the lowest average sea temperature) is February (45.1°F).

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Average daylight in December /
Average sunshine in December
Chester, MD

Average daylight in December / Average sunshine in December - Chester, MD
  • Average daylight in December: 9h and 29min

The month with the longest days is June (Average daylight: 14h and 52min).
The month with the shortest days is December (Average daylight: 9h and 29min).

  • Average sunshine in December: 5.2h

The month with the most sunshine is July (Average sunshine: 10.9h).
The month with the least sunshine is February (Average sunshine: 5h).

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Average sunshine days in December
Chester, MD

Average sunshine days in December - Chester, MD
  • Average sunshine days in December: 17.4 days

The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is May (11.1 days).

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Average UV index in December
Chester, MD

Average UV index in December - Chester, MD
  • Average UV index in December: 2

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

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Average cloud cover in December
Chester, MD

Average cloud cover in December - Chester, MD
  • Average cloud cover in December: 45

The months with the most cloud cover are February, March and December (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 28).

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Average visibility in December
Chester, MD

Average visibility in December - Chester, MD
  • Average visibility in December: 6mi

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

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