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
December brings a slight decrease in the average high-temperature, shifting from a fresh 54°F (12.2°C) in November to a frosty 45.5°F (7.5°C). During the nights in December, Pomona experiences a consistent average temperature of 34.5°F (1.4°C).Humidity
The average relative humidity in December is 76%.Rainfall
In Pomona, during December, the rain falls for 7.3 days and regularly aggregates up to 0.98" (25mm) of precipitation. Throughout the year, there are 107.5 rainfall days, and 10.67" (271mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through March, November and December. In Pomona, in December, snow falls for 1.4 days, with typically accumulated 0.24" (6mm) of snow. In Pomona, during the entire year, snow falls for 9.4 days and aggregates up to 1.73" (44mm) 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 7:05 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:51 pm EST.
Sunshine
In December, the average sunshine is 5.2h.UV index
January 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 vulnerability from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 2 during December leads to these advisories:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are December temperatures?
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?
What is the average length of the day in December?
What time are sunrise and sunset in December?
How long on average sun shines in December?
When is the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Pomona, MD
- Average high temperature in December: 45.5°F
The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (39.2°F).
- Average low temperature in December: 34.5°F
The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (27.9°F).
Average pressure in December
Pomona, 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
Pomona, MD
- Average wind speed in December: 8.6mph
The windiest month (with the highest average wind speed) is February (9.4mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).
Average humidity in December
Pomona, MD
- Average humidity in December: 76%
The month with the highest relative humidity is May (79%).
The months with the lowest relative humidity are January, March, April and November (74%).
Average rainfall in December
Pomona, MD
- Average rainfall in December: 0.98"
The wettest month (with the highest rainfall) is August (1.42").
The driest month (with the least rainfall) is September (0.43").
Average rainfall days in December
Pomona, MD
- Average rainfall days in December: 7.3 days
The month with the highest number of rainy days is July (12.4 days).
The month with the least rainy days is November (5.6 days).
Average snowfall in December
Pomona, MD
- Average snowfall in December: 0.24"
The month with the highest snowfall is January (0.59").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Pomona, MD
- Average snowfall days in December: 1.4 days
The month with the highest number of snowfall days is January (3.1 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
Pomona, 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 1min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).
Average sunshine days in December
Pomona, MD
- Average sunshine days in December: 21.8 days
The month with the most sunshine days is January (22.3 days).
The month with the least sunshine days is July (15.1 days).
Average UV index in December
Pomona, 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
Pomona, 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
Pomona, 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).
Pomona, Maryland, USA
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