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
Start of December brings a slight shift in the average high-temperature, dipping a bit from November's fresh 51.3°F (10.7°C) to an icy 42.6°F (5.9°C). December witnesses an average nighttime temperature of 30.4°F (-0.9°C) in Union Hills.Humidity
In December, the average relative humidity is 79%.Rainfall
In Union Hills, in December, during 9.8 rainfall days, 1.77" (45mm) of precipitation is typically accumulated. Throughout the year, there are 157.5 rainfall days, and 27.52" (699mm) of precipitation is accumulated.Snowfall
Months with snowfall in Union Hills are January through May, October through December. In Union Hills, in December, snow falls for 3.9 days, with typically accumulated 1.57" (40mm) of snow. Throughout the year, in Union Hills, Maryland, there are 22.3 snowfall days, and 9.76" (248mm) of snow is accumulated.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year.On the first day of December in Union Hills, Maryland, sunrise is at 7:10 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:54 pm EST.
Sunshine
In Union Hills, Maryland, the average sunshine in December is 5h.UV index
The months with the lowest UV index in Union Hills are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for average individuals.Note: The UV index of 2 during December leads to these advisories:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Enhance your sun protection with tightly woven, yet airy clothing. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Frequently asked questions
Is it cold in Union Hills during December?
What is the average humidity in December in Union Hills?
How much does it rain in Union Hills in December?
How many days does it snow in December in Union Hills?
What is the month with the shortest days in Union Hills?
How many hours of daylight does Union Hills have in December?
When is the sunrise / sunset in December in Union Hills?
How many hours of sunshine does Union Hills have in December?
What is the month with the lowest UV index in Union Hills?
What is the UV index reading in December in Union Hills?
Average temperature in December
Union Hills, MD
- Average high temperature in December: 42.6°F
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (36.7°F).
- Average low temperature in December: 30.4°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (23.5°F).
Average pressure in December
Union Hills, 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
Union Hills, MD
- Average wind speed in December: 7.7mph
The windiest month (with the highest average wind speed) is March (8.4mph).
The calmest months (with the lowest average wind speed) are July and August (5mph).
Average humidity in December
Union Hills, MD
- Average humidity in December: 79%
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is April (75%).
Average rainfall in December
Union Hills, MD
- Average rainfall in December: 1.77"
The wettest month (with the highest rainfall) is August (3.23").
The driest month (with the least rainfall) is February (1.61").
Average rainfall days in December
Union Hills, MD
- Average rainfall days in December: 9.8 days
The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is January (7.6 days).
Average snowfall in December
Union Hills, MD
- Average snowfall in December: 1.57"
The month with the highest snowfall is March (3.03").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Union Hills, MD
- Average snowfall days in December: 3.9 days
The month with the highest number of snowfall days is January (6.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Union Hills, 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 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in December
Union Hills, MD
- Average sunshine days in December: 18.1 days
The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is May (10.8 days).
Average UV index in December
Union Hills, 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
Union Hills, MD
- Average cloud cover in December: 47
The months with the most cloud cover are February and March (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in December
Union Hills, MD
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
Union Hills, Maryland, USA
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