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
Onset of December comes with a temperature decline, the average high falling from a frosty 45.9°F (7.7°C) in November to an icy 34.2°F (1.2°C). Sandwich in December experiences a low-temperature average of 23.9°F (-4.5°C).Humidity
In December, the average relative humidity is 82%.Rainfall
In Sandwich, in December, it is raining for 8.2 days, with typically 1.85" (47mm) of accumulated precipitation. Throughout the year, there are 168.3 rainfall days, and 35.47" (901mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall in Sandwich. In December, it is snowing for 10.2 days. Throughout December, 2.87" (73mm) of snow is accumulated. Throughout the year, there are 47.1 snowfall days, and 16.61" (422mm) of snow is accumulated.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:02 am and sunset at 4:25 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:34 pm CST.
Sunshine
In Sandwich, the average sunshine in December is 4.2h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A daily high UV index of 1 in December leads to these guidelines:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Sandwich have in December?
When are sunrise and sunset in December?
How long on average sun shines in December?
What is the month with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Sandwich, IL
- Average high temperature in December: 34.2°F
The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (28.2°F).
- Average low temperature in December: 23.9°F
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).
Average pressure in December
Sandwich, IL
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Sandwich, IL
- Average wind speed in December: 9.1mph
The windiest months (with the highest average wind speed) are January and April (9.8mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in December
Sandwich, IL
- Average humidity in December: 82%
The months with the highest relative humidity are July and August (84%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Sandwich, IL
- Average rainfall in December: 1.85"
The wettest month (with the highest rainfall) is May (4.88").
The driest month (with the least rainfall) is November (1.73").
Average rainfall days in December
Sandwich, IL
- Average rainfall days in December: 8.2 days
The month with the highest number of rainy days is July (20.3 days).
The month with the least rainy days is February (6 days).
Average snowfall in December
Sandwich, IL
- Average snowfall in December: 2.87"
The month with the highest snowfall is January (4.88").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Sandwich, IL
- Average snowfall days in December: 10.2 days
The month with the highest number of snowfall days is January (13.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Sandwich, IL
- Average daylight in December: 9h and 1min
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 12min).
- Average sunshine in December: 4h and 1min
The months with the most sunshine are June and August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Sandwich, IL
- Average sunshine days in December: 14.5 days
The month with the most sunshine days is November (16.3 days).
The month with the least sunshine days is July (7.2 days).
Average UV index in December
Sandwich, IL
- 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
Sandwich, IL
- Average cloud cover in December: 57
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 34).
Average visibility in December
Sandwich, IL
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
Sandwich, Illinois, USA
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