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
Onset of December comes with a temperature decline, the average high falling from a cool 52.9°F (11.6°C) in November to a chilly 43.9°F (6.6°C). In Riderwood, in December, the average low-temperature is a cold 33.1°F (0.6°C).Humidity
The average relative humidity in December is 77%.Rainfall
In Riderwood, Maryland, in December, during 7 rainfall days, 0.75" (19mm) of precipitation is typically accumulated. In Riderwood, during the entire year, the rain falls for 102.3 days and collects up to 9.25" (235mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Riderwood, in December, during 2 snowfall days, 0.24" (6mm) of snow is typically accumulated. In Riderwood, during the entire year, snow falls for 12.1 days and aggregates up to 1.81" (46mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:08 am and sunset at 4:43 pm. On the last day of December, in Riderwood, sunrise is at 7:26 am and sunset at 4:53 pm EST.
Sunshine
The average sunshine in December is 5h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Riderwood. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum daily UV index of 2 in December converts into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Frequently asked questions
Is it cold in Riderwood during December?
What is the average humidity in December in Riderwood?
How many days does it rain in December in Riderwood?
How much does it snow in Riderwood in December?
What is the month with the shortest days in Riderwood?
What is the average length of the day in December in Riderwood?
What time are sunrise and sunset in December in Riderwood?
How many hours of sunshine does Riderwood have in December?
What is the month with the lowest UV index in Riderwood?
What is the UV index intensity in December in Riderwood?
Average temperature in December
Riderwood, MD
- Average high temperature in December: 43.9°F
The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in December: 33.1°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (25.9°F).
Average pressure in December
Riderwood, 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
Riderwood, MD
- Average wind speed in December: 8.3mph
The windiest month (with the highest average wind speed) is March (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in December
Riderwood, MD
- Average humidity in December: 77%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is April (73%).
Average rainfall in December
Riderwood, MD
- Average rainfall in December: 0.75"
The wettest month (with the highest rainfall) is August (1.46").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in December
Riderwood, MD
- Average rainfall days in December: 7 days
The month with the highest number of rainy days is July (12.6 days).
The month with the least rainy days is January (5.2 days).
Average snowfall in December
Riderwood, MD
- Average snowfall in December: 0.24"
The month with the highest snowfall is January (0.55").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Riderwood, MD
- Average snowfall days in December: 2 days
The month with the highest number of snowfall days is February (3.8 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
Riderwood, MD
- Average daylight in December: 9h and 2min
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 24min).
- Average sunshine in December: 5h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in December
Riderwood, MD
- Average sunshine days in December: 21.9 days
The month with the most sunshine days is November (22.9 days).
The month with the least sunshine days is July (15.2 days).
Average UV index in December
Riderwood, 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, November and December (UV index 2).
Average cloud cover in December
Riderwood, 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 30).
Average visibility in December
Riderwood, 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).
Riderwood, Maryland, USA
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