December weather forecast
Chester, MD

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Weather in December

The first month of the winter, December, is also a frosty month in Chester, Maryland, with an average temperature fluctuating between 36.3°F (2.4°C) and 46.2°F (7.9°C).

Temperature

December brings a slight decrease in temperature, down from a cool 54.5°F (12.5°C) in November to a chilly 46.2°F (7.9°C). December brings an average low-temperature of 36.3°F (2.4°C) to Chester.

Humidity

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

Rainfall

In December, in Chester, 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

January through April, November and December are months with snowfall in Chester. In Chester, in December, during 1.7 snowfall days, 0.31" (8mm) of snow is typically accumulated. In Chester, during the entire year, snow falls for 11.4 days and aggregates up to 4.13" (105mm) of snow.

Ocean temperature

In Chester, the average seawater temperature in December is 51.6°F (10.9°C).
Note: In 51.6°F (10.9°C), cold shock and rapid breathing can occur when swimming at temperatures below 50°F (10°C).

Daylight

December has the shortest days of the year, with an average of 9h and 30min of daylight.
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 4:53 pm EST.

Sunshine

In Chester, Maryland, 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 reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: The UV index of 2 in December translates into these instructions:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Always opt for UVA and UVB-resistant sunglasses on radiant days. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.

Frequently asked questions

What is the temperature in December in Chester?

The high-temperature in Chester, Maryland, during December is 46.2°F (7.9°C) and the low-temperature is 36.3°F (2.4°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in August is calculated to be 89.6°F (32°C).

What is the average humidity in December?

In December, the average relative humidity is 76%.

How many days does it rain in December?

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

How much does it snow in December?

In Chester, during December, snow falls for 1.7 days and regularly aggregates up to 0.31" (8mm) of snow.

What is the water temperature in December?

In December, the average ocean temperature is 51.6°F (10.9°C). 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.

What is the month with the shortest days?

December has the shortest days of the year in Chester, with an average of 9h and 30min of daylight.

How many hours of daylight does Chester have in December?

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

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:05 am and sunset at 4:43 pm. On the last day of the month, in Chester, sunrise is at 7:23 am and sunset at 4:53 pm EST.

How many hours of sunshine does Chester have in December?

The average sunshine duration in December is 5.2h.

What are the months with the lowest UV index?

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

What is the UV index intensity in December?

In Chester, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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).

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).

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).

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%).

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").

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).

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").

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).

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).

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 3min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 5h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

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).

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).

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).

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).

Chester, Maryland, USA

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