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
Altamont's progression into December involves a drop in the average high-temperature, receding from a fresh 51.4°F (10.8°C) in November to a cold 40.6°F (4.8°C). In Altamont, an average nighttime temperature of 29.3°F (-1.5°C) is expected during December.Humidity
In Altamont, Illinois, the average relative humidity in December is 78%.Rainfall
In Altamont, in December, it is raining for 8.6 days, with typically 1.77" (45mm) of accumulated precipitation. In Altamont, Illinois, during the entire year, the rain falls for 141.3 days and collects up to 26.77" (680mm) of precipitation.Snowfall
Months with snowfall are January through March, November and December. In Altamont, in December, snow falls for 3.7 days, with typically accumulated 1.81" (46mm) of snow. Throughout the year, in Altamont, there are 17.7 snowfall days, and 6.73" (171mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 6:55 am and sunset at 4:32 pm. On the last day of December, sunrise is at 7:13 am and sunset at 4:42 pm CST.
Sunshine
In December, the average sunshine in Altamont is 4.6h.UV index
The months with the lowest UV index in Altamont are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A typical high UV index of 2 in December suggests the following recommendations:
Sun exposure does not present considerable issues for many, yet infants, fair-skinned people, and children necessitate constant protection. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Frequently asked questions
How cold is December in Altamont?
What is the average humidity in December in Altamont?
How many days does it rain in December in Altamont?
How many days does it snow in December in Altamont?
What is the month with the shortest days in Altamont?
What is the average length of the day in December in Altamont?
What time are sunrise and sunset in December in Altamont?
How long on average sun shines in December in Altamont?
What are the months with the lowest UV index in Altamont?
What is the UV index reading in December in Altamont?
Average temperature in December
Altamont, IL
- Average high temperature in December: 40.6°F
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (35.6°F).
- Average low temperature in December: 29.3°F
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in December
Altamont, IL
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Altamont, IL
- Average wind speed in December: 9.4mph
The windiest months (with the highest average wind speed) are January and February (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).
Average humidity in December
Altamont, IL
- Average humidity in December: 78%
The months with the highest relative humidity are July and August (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Altamont, IL
- Average rainfall in December: 1.77"
The wettest month (with the highest rainfall) is April (3.35").
The driest month (with the least rainfall) is February (1.38").
Average rainfall days in December
Altamont, IL
- Average rainfall days in December: 8.6 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (7.3 days).
Average snowfall in December
Altamont, IL
- Average snowfall in December: 1.81"
The month with the highest snowfall is January (2.01").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Altamont, IL
- Average snowfall days in December: 3.7 days
The month with the highest number of snowfall days is January (5.3 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
Altamont, IL
- 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: 4h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in December
Altamont, IL
- Average sunshine days in December: 19.5 days
The month with the most sunshine days is December (19.5 days).
The month with the least sunshine days is May (10.8 days).
Average UV index in December
Altamont, IL
- Average UV index in December: 2
The months with the highest UV index are 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
Altamont, IL
- Average cloud cover in December: 51
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are June and September (Cloud cover 29).
Average visibility in December
Altamont, IL
- 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).
Altamont, Illinois, USA
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