Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
January is the coldest month, exhibiting average temperatures of 28.9°F (-1.7°C) at the peak and 18.9°F (-7.3°C) at the base.Humidity
The most humid month in Decatur is January, with an average relative humidity of 87%.Rainfall
In Decatur, in January, during 5.9 rainfall days, 1.3" (33mm) of precipitation is typically accumulated. Throughout the year, there are 139.4 rainfall days, and 20" (508mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. January is the month with the most snowfall. Snow falls for 17.6 days and accumulates 4.29" (109mm) of snow.Daylight
In January, the average length of the day is 9h and 32min.On the first day of the month, sunrise is at 8:12 am and sunset at 5:22 pm. On the last day of January, sunrise is at 7:57 am and sunset at 5:56 pm EST.
Sunshine
January has the least sunshine of the year, with an average of 2.6h of sunshine.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: The daily high UV index of 1 during January translates into the following recommendations:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest?
How cold is January?
What is the most humid month?
What is the average humidity in January?
How many days does it rain in January?
When does it snow the most?
How much does it snow in Decatur in January?
How many hours of daylight does Decatur have in January?
What time are sunrise and sunset in January?
What is the month with the least sunshine?
How many hours of sunshine does Decatur have in January?
What is the month with the lowest UV index?
What is the UV index intensity in January?
Average temperature in January
Decatur, MI
- Average high temperature in January: 28.9°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 (28.9°F).
- Average low temperature in January: 18.9°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in January
Decatur, MI
- Average pressure in January: 30.09"Hg
The months with the highest atmospheric pressure are January, March and November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in January
Decatur, MI
- Average wind speed in January: 10.3mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in January
Decatur, MI
- Average humidity in January: 87%
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are April and October (77%).
Average rainfall in January
Decatur, MI
- Average rainfall in January: 1.3"
The wettest month (with the highest rainfall) is June (2.6").
The driest month (with the least rainfall) is February (0.98").
Average rainfall days in January
Decatur, MI
- Average rainfall days in January: 5.9 days
The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is February (4.8 days).
Average snowfall in January
Decatur, MI
- Average snowfall in January: 4.29"
The month with the highest snowfall is January (4.29").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Decatur, MI
- Average snowfall days in January: 17.6 days
The month with the highest number of snowfall days is January (17.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Decatur, MI
- Average daylight in January: 9h and 3min
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 January: 2h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 2h and 36min).
Average sunshine days in January
Decatur, MI
- Average sunshine days in January: 9.8 days
The month with the most sunshine days is March (14.4 days).
The month with the least sunshine days is January (9.8 days).
Average UV index in January
Decatur, MI
- Average UV index in January: 1
The months with the highest UV index are June and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in January
Decatur, MI
- Average cloud cover in January: 75
The month with the most cloud cover is January (Cloud cover 75).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in January
Decatur, MI
- Average visibility in January: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
Decatur, Michigan, USA
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