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
In December, the average high-temperature decreases from a chilly 46°F (7.8°C) in November to an icy 34.2°F (1.2°C). In Lyndon, December nights witness a steady temperature drop to a freezing cold 23.5°F (-4.7°C).Humidity
In Lyndon, the average relative humidity in December is 82%.Rainfall
In December, the rain falls for 7.5 days. Throughout December, 1.57" (40mm) of precipitation is accumulated. In Lyndon, during the entire year, the rain falls for 151.5 days and collects up to 30.24" (768mm) of precipitation.Snowfall
Months with snowfall in Lyndon, Illinois, are January through April, October through December. In December, in Lyndon, Illinois, it is snowing for 7.8 days. Throughout December, 2.76" (70mm) of snow is accumulated. In Lyndon, during the entire year, snow falls for 37.9 days and aggregates up to 15.83" (402mm) of snow.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year in Lyndon, Illinois.On the first day of December in Lyndon, sunrise is at 7:07 am and sunset at 4:30 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:39 pm CST.
Sunshine
In December, the average sunshine in Lyndon, Illinois, 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 unsafe exposure to UV radiation for the ordinary person.Note: In December, the maximum UV index of 1 suggests these recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Frequently asked questions
How cold is December in Lyndon?
What is the average humidity in December in Lyndon?
How much does it rain in Lyndon in December?
How many days does it snow in December in Lyndon?
What is the month with the shortest days in Lyndon?
What is the average length of the day in December in Lyndon?
When is the sunrise / sunset in December in Lyndon?
How many hours of sunshine does Lyndon have in December?
What are the months with the lowest UV index in Lyndon?
What is the UV index reading in December in Lyndon?
Average temperature in December
Lyndon, IL
- Average high temperature in December: 34.2°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (27.7°F).
- Average low temperature in December: 23.5°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure in December
Lyndon, IL
- 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 (29.91"Hg).
Average wind speed in December
Lyndon, IL
- Average wind speed in December: 9.6mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in December
Lyndon, IL
- Average humidity in December: 82%
The months with the highest relative humidity are January and July (85%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Lyndon, IL
- Average rainfall in December: 1.57"
The wettest month (with the highest rainfall) is May (4.53").
The driest month (with the least rainfall) is January (1.42").
Average rainfall days in December
Lyndon, IL
- Average rainfall days in December: 7.5 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is January (5.2 days).
Average snowfall in December
Lyndon, IL
- Average snowfall in December: 2.76"
The month with the highest snowfall is January (4.49").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Lyndon, IL
- Average snowfall days in December: 7.8 days
The month with the highest number of snowfall days is January (10.5 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
Lyndon, IL
- 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 month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in December
Lyndon, IL
- Average sunshine days in December: 17 days
The month with the most sunshine days is November (17.8 days).
The month with the least sunshine days is June (9.1 days).
Average UV index in December
Lyndon, IL
- Average UV index in December: 1
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Lyndon, IL
- Average cloud cover in December: 56
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility in December
Lyndon, IL
- 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).
Lyndon, Illinois, USA
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