December weather forecastMount Union, IA
December
Weather in December
The first month of the winter, December, is also a wintry month in Mount Union, Iowa, with an average temperature fluctuating between 24.6°F (-4.1°C) and 36°F (2.2°C).Temperature
Welcoming December, Mount Union observes a shift in the average high-temperature, falling from November's chilly 48°F (8.9°C) to a wintry 36°F (2.2°C). During the nights in December, Mount Union experiences a consistent average temperature of 24.6°F (-4.1°C).Humidity
In December, the average relative humidity in Mount Union is 80%.Rainfall
The months with the least rainfall are February and December Rain falls for 7.3 days and accumulates 1.38" (35mm) of rain.Snowfall
January through April, October through December are months with snowfall. In December, it is snowing for 6 days. Throughout December, 1.65" (42mm) of snow is accumulated. Throughout the year, there are 30.7 snowfall days, and 15" (381mm) of snow is accumulated.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:11 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 4:47 pm CST.
Sunshine
In December, the average sunshine is 4.5h.UV index
In Mount Union, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for average individuals.Note: An average maximum UV index of 2 in December leads to these recommendations:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mount Union, IA
- Average high temperature in December: 36°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in December: 24.6°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).
Average pressure in December
Mount Union, IA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Mount Union, IA
- Average wind speed in December: 10.1mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.9mph).
Average humidity in December
Mount Union, IA
- Average humidity in December: 80%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Mount Union, IA
- Average rainfall in December: 1.38"
The wettest month (with the highest rainfall) is May (4.29").
The driest months (with the least rainfall) are February and December (1.38").
Average rainfall days in December
Mount Union, IA
- Average rainfall days in December: 7.3 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (4.6 days).
Average snowfall in December
Mount Union, IA
- Average snowfall in December: 1.65"
The month with the highest snowfall is January (4.76").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Mount Union, IA
- Average snowfall days in December: 6 days
The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Mount Union, IA
- Average daylight in December: 9h and 18min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 4h and 30min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in December
Mount Union, IA
- Average sunshine days in December: 18 days
The month with the most sunshine days is October (18.4 days).
The month with the least sunshine days is May (10.6 days).
Average UV index in December
Mount Union, IA
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Mount Union, IA
- Average cloud cover in December: 53
The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are July, August and September (Cloud cover 31).
Average visibility in December
Mount Union, IA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
