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 shift from November to December includes a minor decrease in the average high-temperature, lightly dropping from a cool 50.9°F (10.5°C) to a wintry 42.1°F (5.6°C). During the month of December, Rocky Ridge experiences a steady low-temperature average of 30.2°F (-1°C).Humidity
In December, the average relative humidity in Rocky Ridge, Maryland, is 79%.Rainfall
In December, the rain falls for 10.8 days. Throughout December, 2.4" (61mm) of precipitation is accumulated. In Rocky Ridge, during the entire year, the rain falls for 164.1 days and collects up to 31.97" (812mm) of precipitation.Snowfall
Months with snowfall in Rocky Ridge are January through May, October through December. In Rocky Ridge, during December, snow falls for 4.8 days and regularly aggregates up to 2.13" (54mm) of snow. In Rocky Ridge, during the entire year, snow falls for 26.7 days and aggregates up to 14.13" (359mm) of snow.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:11 am and sunset at 4:45 pm. On the last day of December, in Rocky Ridge, Maryland, sunrise is at 7:29 am and sunset at 4:55 pm EST.
Sunshine
The average sunshine in December is 4.9h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The daily high UV index of 2 in December translates into this advice:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
How cold does it get in Rocky Ridge in December?
What is the average humidity in December in Rocky Ridge?
How many days does it rain in December in Rocky Ridge?
How much does it snow in Rocky Ridge in December?
What is the month with the shortest days in Rocky Ridge?
How many hours of daylight does Rocky Ridge have in December?
When are sunrise and sunset in December in Rocky Ridge?
How long on average sun shines in December in Rocky Ridge?
What is the month with the lowest UV index in Rocky Ridge?
How high is the UV index in December in Rocky Ridge?
Average temperature in December
Rocky Ridge, MD
- Average high temperature in December: 42.1°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (36.7°F).
- Average low temperature in December: 30.2°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in December
Rocky Ridge, 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
Rocky Ridge, MD
- Average wind speed in December: 7.3mph
The windiest month (with the highest average wind speed) is January (8mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).
Average humidity in December
Rocky Ridge, MD
- Average humidity in December: 79%
The month with the highest relative humidity is October (80%).
The months with the lowest relative humidity are April and July (75%).
Average rainfall in December
Rocky Ridge, MD
- Average rainfall in December: 2.4"
The wettest month (with the highest rainfall) is May (3.5").
The driest month (with the least rainfall) is February (2.2").
Average rainfall days in December
Rocky Ridge, MD
- Average rainfall days in December: 10.8 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is January (8.7 days).
Average snowfall in December
Rocky Ridge, MD
- Average snowfall in December: 2.13"
The month with the highest snowfall is January (4.53").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Rocky Ridge, MD
- Average snowfall days in December: 4.8 days
The month with the highest number of snowfall days is January (8.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Rocky Ridge, 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: 4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in December
Rocky Ridge, MD
- Average sunshine days in December: 16.8 days
The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is May (11.2 days).
Average UV index in December
Rocky Ridge, 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
Rocky Ridge, MD
- Average cloud cover in December: 48
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in December
Rocky Ridge, MD
- Average visibility in December: 5mi
The months with the highest visibility are April, June, July, August and November (6mi).
The months with the lowest visibility are January, February, March, May, September, October and December (5mi).
Rocky Ridge, Maryland, USA
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