December weather forecast
Rock Anna, MD

Share

Weather in December

The first month of the winter, December, is still a chilly month in Rock Anna, Maryland, with an average temperature ranging between max 45.5°F (7.5°C) and min 34.7°F (1.5°C).

Temperature

Start of December brings a slight shift in the average high-temperature, dipping a bit from November's cool 53.8°F (12.1°C) to a frosty 45.5°F (7.5°C). Throughout December, the temperature falls to an average low of 34.7°F (1.5°C).

Humidity

The average relative humidity in December is 75%.

Rainfall

In Rock Anna, in December, during 11.4 rainfall days, 2.83" (72mm) of precipitation is typically accumulated. In Rock Anna, Maryland, during the entire year, the rain falls for 156.2 days and collects up to 31.34" (796mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. In Rock Anna, during December, snow falls for 2.4 days and regularly aggregates up to 0.63" (16mm) of snow. In Rock Anna, during the entire year, snow falls for 14 days and aggregates up to 6.14" (156mm) 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 December, sunrise is at 7:06 am and sunset at 4:43 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:53 pm EST.

Sunshine

With an average of 5h of sunshine, December has the least sunshine of the year.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index in Rock Anna. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for average individuals.
Note: In December, a daily maximum UV index of 2 leads to the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Updated: Jun 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average December temperature?

Rock Anna in December has an average high-temperature of 45.5°F (7.5°C) and an average low-temperature of 34.7°F (1.5°C). In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines air temperature and relative humidity, is appraised at 91.4°F (33°C).

What is the average humidity in December?

In December, the average relative humidity is 75%.

How much does it rain in Rock Anna in December?

In Rock Anna, during December, the rain falls for 11.4 days and regularly aggregates up to 2.83" (72mm) of precipitation.

How much does it snow in December?

In Rock Anna, Maryland, in December, snow falls for 2.4 days, with typically accumulated 0.63" (16mm) of snow.

What is the month with the shortest days?

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 28min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:06 am and sunset at 4:43 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:53 pm EST.

What is the month with the least sunshine?

With an average of 5h of sunshine, December has the least sunshine of the year.

How long on average sun shines in December?

The average sunshine duration in December is 5h.

What is the month with the lowest UV index?

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

How high is the UV index in December?

In December, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from 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
Rock Anna, MD

Average temperature in December - Rock Anna, MD
  • Average high temperature in December: 45.5°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (39.6°F).

  • Average low temperature in December: 34.7°F

The month with the highest average low temperature is July (70.7°F).
The coldest month (with the lowest average low temperature) is January (28.4°F).

Average pressure in December
Rock Anna, MD

Average pressure in December - Rock Anna, 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
Rock Anna, MD

Average wind speed in December - Rock Anna, MD
  • Average wind speed in December: 8.6mph

The windiest month (with the highest average wind speed) is March (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).

Average humidity in December
Rock Anna, MD

Average humidity in December - Rock Anna, MD
  • Average humidity in December: 75%

The month with the highest relative humidity is May (78%).
The months with the lowest relative humidity are January, March, April and November (72%).

Average rainfall in December
Rock Anna, MD

Average rainfall in December - Rock Anna, MD
  • Average rainfall in December: 2.83"

The wettest month (with the highest rainfall) is August (3.54").
The driest month (with the least rainfall) is January (2.01").

Average rainfall days in December
Rock Anna, MD

Average rainfall days in December - Rock Anna, MD
  • Average rainfall days in December: 11.4 days

The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is November (9.4 days).

Average snowfall in December
Rock Anna, MD

Average snowfall in December - Rock Anna, MD
  • Average snowfall in December: 0.63"

The month with the highest snowfall is January (2.05").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Rock Anna, MD

Average snowfall days in December - Rock Anna, MD
  • Average snowfall days in December: 2.4 days

The month with the highest number of snowfall days is January (4.4 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
Rock Anna, MD

Average daylight in December / Average sunshine in December - Rock Anna, 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 0min

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

Average sunshine days in December
Rock Anna, MD

Average sunshine days in December - Rock Anna, MD
  • Average sunshine days in December: 16.9 days

The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is May (10.8 days).

Average UV index in December
Rock Anna, MD

Average UV index in December - Rock Anna, 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
Rock Anna, MD

Average cloud cover in December - Rock Anna, MD
  • Average cloud cover in December: 44

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

Average visibility in December
Rock Anna, MD

Average visibility in December - Rock Anna, 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).

Rock Anna, Maryland, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location