Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The onset of December results in a small decrease in the average high-temperature, moderately receding from a fresh 54.5°F (12.5°C) in November to a frosty 46.6°F (8.1°C). The nighttime temperature dips to an icy 35.8°F (2.1°C) on average during December.Humidity
In December, the average relative humidity is 77%.Rainfall
In December, the rain falls for 9.9 days. Throughout December, 2.2" (56mm) of precipitation is accumulated. In Rolph Landing, during the entire year, the rain falls for 154.5 days and collects up to 28.66" (728mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In December, it is snowing for 1.3 days. Throughout December, 0.55" (14mm) of snow is accumulated. In Rolph Landing, during the entire year, snow falls for 9.1 days and aggregates up to 4.21" (107mm) of snow.Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:03 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:51 pm EST.
Sunshine
The average sunshine in December is 5.3h.UV index
January and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily high UV index of 2 in December translates into this advice:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in December?
What is the average humidity in December?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Rolph Landing have in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Rolph Landing have in December?
When is the lowest UV index in Rolph Landing?
What is the UV index reading in December?
Average temperature in December
Rolph Landing, MD
- Average high temperature in December: 46.6°F
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (40.5°F).
- Average low temperature in December: 35.8°F
The month with the highest average low temperature is July (70.3°F).
The coldest month (with the lowest average low temperature) is January (29.1°F).
Average pressure in December
Rolph Landing, MD
- Average pressure in December: 30.1"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
Rolph Landing, MD
- Average wind speed in December: 8.8mph
The windiest month (with the highest average wind speed) is February (9.8mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in December
Rolph Landing, MD
- Average humidity in December: 77%
The months with the highest relative humidity are May and August (79%).
The month with the lowest relative humidity is January (73%).
Average rainfall in December
Rolph Landing, MD
- Average rainfall in December: 2.2"
The wettest month (with the highest rainfall) is August (3.46").
The driest month (with the least rainfall) is January (1.69").
Average rainfall days in December
Rolph Landing, MD
- Average rainfall days in December: 9.9 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is November (7.9 days).
Average snowfall in December
Rolph Landing, MD
- Average snowfall in December: 0.55"
The month with the highest snowfall is January (1.5").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Rolph Landing, MD
- Average snowfall days in December: 1.3 days
The month with the highest number of snowfall days is January (3.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Rolph Landing, 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 2min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).
Average sunshine days in December
Rolph Landing, MD
- Average sunshine days in December: 18.4 days
The month with the most sunshine days is November (20.7 days).
The month with the least sunshine days is July (10.6 days).
Average UV index in December
Rolph Landing, 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
Rolph Landing, 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
Rolph Landing, 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).
Rolph Landing, Maryland, USA
Weather forecast for your location
2. Allow the app to use your location