December weather forecast
Rosaryville, MD

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Weather in December

December, the first month of the winter in Rosaryville, is also a frosty month, with an average temperature varying between 45.7°F (7.6°C) and 34.7°F (1.5°C).

Temperature

In Rosaryville, entering December brings a subtle temperature decrement, reducing from November's fresh 54.5°F (12.5°C) to a frosty 45.7°F (7.6°C). December nights are marked by an average temperature drop to a cold 34.7°F (1.5°C).

Humidity

In December, the average relative humidity is 76%.

Rainfall

In Rosaryville, in December, it is raining for 11.1 days, with typically 2.68" (68mm) of accumulated precipitation. Throughout the year, there are 164.8 rainfall days, and 32.87" (835mm) of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall. In Rosaryville, during December, snow falls for 2.5 days and regularly aggregates up to 1.06" (27mm) of snow. In Rosaryville, during the entire year, snow falls for 15.1 days and aggregates up to 8.5" (216mm) 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 4:55 pm EST.

Sunshine

In December, the average sunshine is 5.2h.

UV index

January, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.
Note: The daily high UV index of 2 in December translates into this advice:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Updated: Jul 15, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in December?

The high-temperature, in December, in Rosaryville, records 45.7°F (7.6°C), while the low-temperature is 34.7°F (1.5°C). In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines relative humidity and air temperature, is evaluated at 93.2°F (34°C).

What is the average humidity in December?

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

How much does it rain in December?

In Rosaryville, in December, during 11.1 rainfall days, 2.68" (68mm) of precipitation is typically accumulated.

How much does it snow in December?

In Rosaryville, in December, during 2.5 snowfall days, 1.06" (27mm) of snow is typically accumulated.

What is the month with the shortest days in Rosaryville?

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

What is the average length of the day in December?

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

When is the sunrise / sunset in December?

In December, on the first day of the month, 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 4:55 pm EST.

How long on average sun shines in December?

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

What is the month with the lowest UV index?

January, November 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 Rosaryville, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health threat from unsafe exposure to Sun's UV rays.
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
Rosaryville, MD

Average temperature in December - Rosaryville, MD
  • Average high temperature in December: 45.7°F

The warmest month (with the highest average high temperature) is July (86.7°F).
The month with the lowest average high temperature is January (40.1°F).

  • Average low temperature in December: 34.7°F

The month with the highest average low temperature is July (69.8°F).
The coldest month (with the lowest average low temperature) is January (28.2°F).

Average pressure in December
Rosaryville, MD

Average pressure in December - Rosaryville, 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 (29.94"Hg).

Average wind speed in December
Rosaryville, MD

Average wind speed in December - Rosaryville, MD
  • Average wind speed in December: 7.6mph

The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.4mph).

Average humidity in December
Rosaryville, MD

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

The month with the highest relative humidity is May (77%).
The months with the lowest relative humidity are January, March and April (72%).

Average rainfall in December
Rosaryville, MD

Average rainfall in December - Rosaryville, MD
  • Average rainfall in December: 2.68"

The wettest month (with the highest rainfall) is August (3.94").
The driest month (with the least rainfall) is January (2.05").

Average rainfall days in December
Rosaryville, MD

Average rainfall days in December - Rosaryville, MD
  • Average rainfall days in December: 11.1 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is November (8.8 days).

Average snowfall in December
Rosaryville, MD

Average snowfall in December - Rosaryville, MD
  • Average snowfall in December: 1.06"

The month with the highest snowfall is January (2.76").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Rosaryville, MD

Average snowfall days in December - Rosaryville, MD
  • Average snowfall days in December: 2.5 days

The month with the highest number of snowfall days is January (4.6 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
Rosaryville, MD

Average daylight in December / Average sunshine in December - Rosaryville, 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 1min

The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).

Average sunshine days in December
Rosaryville, MD

Average sunshine days in December - Rosaryville, MD
  • Average sunshine days in December: 16.7 days

The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (10.8 days).

Average UV index in December
Rosaryville, MD

Average UV index in December - Rosaryville, 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, November and December (UV index 2).

Average cloud cover in December
Rosaryville, MD

Average cloud cover in December - Rosaryville, MD
  • Average cloud cover in December: 44

The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 29).

Average visibility in December
Rosaryville, MD

Average visibility in December - Rosaryville, 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).

Rosaryville, Maryland, USA

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