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
Observing a mild shift, the average high-temperature during December reduces from November's chilly 44.6°F (7°C) to a freezing cold 31.8°F (-0.1°C). Downers Grove temperatures generally rest at a low of 21.4°F (-5.9°C) during the December nights.Humidity
In December, the average relative humidity is 82%.Rainfall
In Downers Grove, Iowa, during December, the rain falls for 7.7 days and regularly aggregates up to 1.42" (36mm) of precipitation. Throughout the year, in Downers Grove, Iowa, there are 142.5 rainfall days, and 28.27" (718mm) of precipitation is accumulated.Snowfall
Months with snowfall in Downers Grove are January through April, October through December. In Downers Grove, in December, during 9.4 snowfall days, 3.07" (78mm) of snow is typically accumulated. In Downers Grove, during the entire year, snow falls for 43.2 days and aggregates up to 17.17" (436mm) of snow.Daylight
The month with the shortest days in Downers Grove is December, with an average of 9h and 12min of daylight.On the first day of December, sunrise is at 7:15 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 7:33 am and sunset at 4:43 pm CST.
Sunshine
In Downers Grove, the average sunshine in December is 4.2h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index in Downers Grove. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In December, a daily maximum UV index of 1 leads to the following instructions:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Frequently asked questions
How cold is it in Downers Grove in December?
What is the average humidity in December in Downers Grove?
How much does it rain in Downers Grove in December?
How many days does it snow in December in Downers Grove?
What is the month with the shortest days in Downers Grove?
What is the average length of the day in December in Downers Grove?
When is the sunrise / sunset in December in Downers Grove?
How long on average sun shines in December in Downers Grove?
What are the months with the lowest UV index in Downers Grove?
How high is the UV index in December in Downers Grove?
Average temperature in December
Downers Grove, IA
- Average high temperature in December: 31.8°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (25.2°F).
- Average low temperature in December: 21.4°F
The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (13.3°F).
Average pressure in December
Downers Grove, IA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Downers Grove, IA
- Average wind speed in December: 10mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).
Average humidity in December
Downers Grove, IA
- Average humidity in December: 82%
The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Downers Grove, IA
- Average rainfall in December: 1.42"
The wettest month (with the highest rainfall) is May (4.25").
The driest months (with the least rainfall) are January and February (1.26").
Average rainfall days in December
Downers Grove, IA
- Average rainfall days in December: 7.7 days
The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is January (5.2 days).
Average snowfall in December
Downers Grove, IA
- Average snowfall in December: 3.07"
The month with the highest snowfall is January (5.04").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Downers Grove, IA
- Average snowfall days in December: 9.4 days
The month with the highest number of snowfall days is January (12.1 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
Downers Grove, 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 1min
The months with the most sunshine are July and August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Downers Grove, IA
- Average sunshine days in December: 16.7 days
The month with the most sunshine days is September (17 days).
The month with the least sunshine days is June (10.5 days).
Average UV index in December
Downers Grove, IA
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Downers Grove, IA
- Average cloud cover in December: 57
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in December
Downers Grove, IA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).
Downers Grove, Iowa, USA
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