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 onset of December entails a temperature shift, as the average high-temperature decreases from a frosty 45.9°F (7.7°C) in November to a wintry 32°F (0°C). Green Brier observes an average nighttime temperature of 21°F (-6.1°C) during December.Humidity
In December, the average relative humidity is 80%.Rainfall
In Green Brier, during December, the rain falls for 4.8 days and regularly aggregates up to 1.34" (34mm) of precipitation. In Green Brier, during the entire year, the rain falls for 125.7 days and collects up to 26.5" (673mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Green Brier. In Green Brier, Iowa, in December, during 8.3 snowfall days, 2.64" (67mm) of snow is typically accumulated. In Green Brier, during the entire year, snow falls for 38.1 days and aggregates up to 15.31" (389mm) of snow.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:26 am and sunset at 4:47 pm. On the last day of December, in Green Brier, Iowa, sunrise is at 7:45 am and sunset at 4:56 pm CST.
Sunshine
In December, the average sunshine is 4.7h.UV index
The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A daily high UV index of 2 in December leads to these guidelines:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Green Brier?
What is the average humidity in December in Green Brier?
How much does it rain in Green Brier in December?
How many days does it snow in December in Green Brier?
What is the month with the shortest days in Green Brier?
How many hours of daylight does Green Brier have in December?
What time are sunrise and sunset in December in Green Brier?
How long on average sun shines in December in Green Brier?
When is the lowest UV index in Green Brier?
What is the UV index reading in December in Green Brier?
Average temperature in December
Green Brier, IA
- Average high temperature in December: 32°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (26.8°F).
- Average low temperature in December: 21°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 (13.5°F).
Average pressure in December
Green Brier, IA
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in December
Green Brier, IA
- Average wind speed in December: 10.2mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity in December
Green Brier, IA
- Average humidity in December: 80%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (69%).
Average rainfall in December
Green Brier, IA
- Average rainfall in December: 1.34"
The wettest month (with the highest rainfall) is May (4.06").
The driest month (with the least rainfall) is January (0.87").
Average rainfall days in December
Green Brier, IA
- Average rainfall days in December: 4.8 days
The month with the highest number of rainy days is June (17.3 days).
The month with the least rainy days is February (3.4 days).
Average snowfall in December
Green Brier, IA
- Average snowfall in December: 2.64"
The month with the highest snowfall is January (4.29").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Green Brier, IA
- Average snowfall days in December: 8.3 days
The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Green Brier, IA
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in December
Green Brier, IA
- Average sunshine days in December: 18.8 days
The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is June (11.1 days).
Average UV index in December
Green Brier, IA
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in December
Green Brier, IA
- Average cloud cover in December: 50
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are July and September (Cloud cover 30).
Average visibility in December
Green Brier, IA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Green Brier, Iowa, USA
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