December weather forecast
Saint Charles, MD

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Weather in December

December, the first month of the winter in Saint Charles, is still a chilly month, with an average temperature varying between 46.9°F (8.3°C) and 34.5°F (1.4°C).

Temperature

The average high-temperature shows a slight dip in December, from November's fresh 55°F (12.8°C) to a frosty 46.9°F (8.3°C). During December, Saint Charles sees a mean low-temperature of 34.5°F (1.4°C).

Humidity

In December, the average relative humidity is 77%.

Rainfall

In Saint Charles, in December, during 11.5 rainfall days, 2.28" (58mm) of precipitation is typically accumulated. Throughout the year, there are 151.4 rainfall days, and 29.33" (745mm) of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall. In December, it is snowing for 2 days. Throughout December, 1.02" (26mm) of snow is accumulated. In Saint Charles, during the entire year, snow falls for 13.5 days and aggregates up to 7.24" (184mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 30min of daylight.
On the first day of the month, sunrise is at 7:07 am and sunset at 4:46 pm. On the last day of December, sunrise is at 7:25 am and sunset at 4:56 pm EST.

Sunshine

The months with the least sunshine are February and December, with an average of 5h of sunshine.

UV index

The months with the lowest UV index are January, February and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for the average person.
Note: A maximum high UV index of 2 in December translates into the following recommendations:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Stay sun-safe with clothing that is both closely woven and worn loosely. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.

Frequently asked questions

What is the average December temperature?

During December, Saint Charles experiences an average high-temperature of 46.9°F (8.3°C) and a low-temperature of 34.5°F (1.4°C). The average heat index (a.k.a. 'feels like', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in August is calculated to be 95°F (35°C).

What is the average humidity in December?

The average relative humidity in December in Saint Charles is 77%.

How much does it rain in December?

In December, the rain falls for 11.5 days. Throughout December, 2.28" (58mm) of precipitation is accumulated.

How many days does it snow in December?

In December, it is snowing for 2 days. Throughout December, 1.02" (26mm) of snow is accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 30min of daylight.

How many hours of daylight does Saint Charles have in December?

In Saint Charles, the average day length in December is 9h and 31min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:07 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:56 pm EST.

What are the months with the least sunshine?

The months with the least sunshine are February and December, with an average of 5h of sunshine.

How many hours of sunshine does Saint Charles have in December?

In December, the average sunshine duration is 5h.

When is the lowest UV index?

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

What is the UV index reading in December?

In Saint Charles, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to 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
Saint Charles, MD

Average temperature in December - Saint Charles, MD
  • Average high temperature in December: 46.9°F

The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (41.5°F).

  • Average low temperature in December: 34.5°F

The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (28.4°F).

Average pressure in December
Saint Charles, MD

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

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in December
Saint Charles, MD

Average wind speed in December - Saint Charles, MD
  • Average wind speed in December: 6.7mph

The windiest months (with the highest average wind speed) are March and April (7.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.2mph).

Average humidity in December
Saint Charles, MD

Average humidity in December - Saint Charles, MD
  • Average humidity in December: 77%

The month with the highest relative humidity is May (78%).
The months with the lowest relative humidity are January, March and April (73%).

Average rainfall in December
Saint Charles, MD

Average rainfall in December - Saint Charles, MD
  • Average rainfall in December: 2.28"

The wettest month (with the highest rainfall) is August (3.31").
The driest month (with the least rainfall) is January (1.85").

Average rainfall days in December
Saint Charles, MD

Average rainfall days in December - Saint Charles, MD
  • Average rainfall days in December: 11.5 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is November (8.7 days).

Average snowfall in December
Saint Charles, MD

Average snowfall in December - Saint Charles, MD
  • Average snowfall in December: 1.02"

The month with the highest snowfall is January (2.32").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Saint Charles, MD

Average snowfall days in December - Saint Charles, MD
  • Average snowfall days in December: 2 days

The month with the highest number of snowfall days is January (4.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Saint Charles, MD

Average daylight in December / Average sunshine in December - Saint Charles, MD
  • Average daylight in December: 9h and 3min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 5h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The months with the least sunshine are February and December (Average sunshine: 5h and 0min).

Average sunshine days in December
Saint Charles, MD

Average sunshine days in December - Saint Charles, MD
  • Average sunshine days in December: 16.9 days

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is May (11.4 days).

Average UV index in December
Saint Charles, MD

Average UV index in December - Saint Charles, 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, February and December (UV index 2).

Average cloud cover in December
Saint Charles, MD

Average cloud cover in December - Saint Charles, MD
  • Average cloud cover in December: 45

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in December
Saint Charles, MD

Average visibility in December - Saint Charles, MD
  • Average visibility in December: 6mi

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

Saint Charles, Maryland, USA

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