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
The arrival of December corresponds with a reduction in the average high-temperature, down from November's frosty 45.1°F (7.3°C) to a cold 34.2°F (1.2°C). In South Lyon, the nocturnal temperatures throughout December show a marginal dip from the daytime averages, settling at a freezing cold 25.3°F (-3.7°C).Humidity
The average relative humidity in December in South Lyon is 84%.Rainfall
In December, the rain falls for 5.9 days. Throughout December, 0.59" (15mm) of precipitation is accumulated. Throughout the year, in South Lyon, there are 121.2 rainfall days, and 11.77" (299mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In December, in South Lyon, it is snowing for 9.3 days. Throughout December, 0.79" (20mm) of snow is accumulated. Throughout the year, in South Lyon, there are 46.7 snowfall days, and 5.87" (149mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:45 am and sunset at 5:02 pm. On the last day of December, in South Lyon, sunrise is at 8:04 am and sunset at 5:11 pm EST.
Sunshine
In South Lyon, Michigan, the average sunshine in December is 3.2h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The maximum daily UV index of 1 during December translates into the following directions:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Boost your sun resistance with garments that are densely woven yet spacious. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in South Lyon in December?
What is the average humidity in December in South Lyon?
How many days does it rain in December in South Lyon?
How many days does it snow in December in South Lyon?
What is the month with the shortest days in South Lyon?
What is the average length of the day in December in South Lyon?
When is the sunrise / sunset in December in South Lyon?
How many hours of sunshine does South Lyon have in December?
What is the month with the lowest UV index in South Lyon?
What is the UV index reading in December in South Lyon?
Average temperature in December
South Lyon, MI
- Average high temperature in December: 34.2°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (28°F).
- Average low temperature in December: 25.3°F
The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is January (17.2°F).
Average pressure in December
South Lyon, MI
- Average pressure in December: 30.08"Hg
The months with the highest atmospheric pressure are March and November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
South Lyon, MI
- Average wind speed in December: 9.6mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).
Average humidity in December
South Lyon, MI
- Average humidity in December: 84%
The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is April (76%).
Average rainfall in December
South Lyon, MI
- Average rainfall in December: 0.59"
The wettest month (with the highest rainfall) is May (1.54").
The driest month (with the least rainfall) is February (0.51").
Average rainfall days in December
South Lyon, MI
- Average rainfall days in December: 5.9 days
The month with the highest number of rainy days is May (15.1 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in December
South Lyon, MI
- Average snowfall in December: 0.79"
The month with the highest snowfall is February (1.61").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
South Lyon, MI
- Average snowfall days in December: 9.3 days
The month with the highest number of snowfall days is January (11.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
South Lyon, MI
- 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 6min).
- Average sunshine in December: 3h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).
Average sunshine days in December
South Lyon, MI
- Average sunshine days in December: 18 days
The month with the most sunshine days is October (19.3 days).
The month with the least sunshine days is May (12.8 days).
Average UV index in December
South Lyon, MI
- 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
South Lyon, MI
- Average cloud cover in December: 66
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in December
South Lyon, MI
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
South Lyon, Michigan, USA
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