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
Mountain Brook experiences a moderate temperature shift at the start of December, with average high-temperatures adjusting a bit from a refreshing 61.9°F (16.6°C) in November to a cool 54.5°F (12.5°C). During December, the average low-temperature in Mountain Brook is a cold 39.9°F (4.4°C).Humidity
The most humid month in Mountain Brook is December, with an average relative humidity of 79%.Rainfall
In Mountain Brook, in December, during 10.6 rainfall days, 1.89" (48mm) of precipitation is typically accumulated. Throughout the year, there are 143.1 rainfall days, and 18.58" (472mm) of precipitation is accumulated.Snowfall
Months with snowfall in Mountain Brook are January through March, November and December. In December, in Mountain Brook, it is snowing for 0.4 days. Throughout December, 0.08" (2mm) of snow is accumulated. In Mountain Brook, during the entire year, snow falls for 2.5 days and aggregates up to 0.35" (9mm) of snow.Daylight
With an average of 10h and 0min of daylight, December has the shortest days of the year in Mountain Brook.On the first day of the month, sunrise is at 6:33 am and sunset at 4:38 pm. On the last day of December, in Mountain Brook, sunrise is at 6:51 am and sunset at 4:49 pm CST.
Sunshine
The average sunshine in December is 4.9h.UV index
With an average maximum UV index of 2, December is the month with the lowest UV index. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In December, a regular UV index of 2 translates into these guidelines:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. Direct Sun exposure should be minimized especially during midday when radiation is most intense. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Frequently asked questions
What are the temperatures in Mountain Brook in December?
What is the most humid month in Mountain Brook?
What is the average humidity in December in Mountain Brook?
How many days does it rain in December in Mountain Brook?
How much does it snow in Mountain Brook in December?
What is the month with the shortest days in Mountain Brook?
How many hours of daylight does Mountain Brook have in December?
What time are sunrise and sunset in December in Mountain Brook?
How many hours of sunshine does Mountain Brook have in December?
When is the lowest UV index in Mountain Brook?
What is the UV index intensity in December in Mountain Brook?
Average temperature in December
Mountain Brook, AL
- Average high temperature in December: 54.5°F
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (50.7°F).
- Average low temperature in December: 39.9°F
The month with the highest average low temperature is July (71.1°F).
The coldest month (with the lowest average low temperature) is January (35.2°F).
Average pressure in December
Mountain Brook, AL
- Average pressure in December: 30.15"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in December
Mountain Brook, AL
- Average wind speed in December: 7mph
The windiest month (with the highest average wind speed) is February (7.4mph).
The calmest months (with the lowest average wind speed) are July and August (4.5mph).
Average humidity in December
Mountain Brook, AL
- Average humidity in December: 79%
The month with the highest relative humidity is December (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Mountain Brook, AL
- Average rainfall in December: 1.89"
The wettest month (with the highest rainfall) is June (1.97").
The driest month (with the least rainfall) is November (1.02").
Average rainfall days in December
Mountain Brook, AL
- Average rainfall days in December: 10.6 days
The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is November (7.9 days).
Average snowfall in December
Mountain Brook, AL
- Average snowfall in December: 0.08"
The month with the highest snowfall is January (0.12").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Mountain Brook, AL
- Average snowfall days in December: 0.4 days
The months with the highest number of snowfall days are January and February (0.8 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
Mountain Brook, AL
- Average daylight in December: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in December
Mountain Brook, AL
- Average sunshine days in December: 17.5 days
The month with the most sunshine days is October (20.9 days).
The month with the least sunshine days is July (11.1 days).
Average UV index in December
Mountain Brook, AL
- Average UV index in December: 2
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in December
Mountain Brook, AL
- Average cloud cover in December: 47
The month with the most cloud cover is February (Cloud cover 48).
The months with the least cloud cover are June and September (Cloud cover 30).
Average visibility in December
Mountain Brook, AL
- 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).
Mountain Brook, Alabama, USA
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