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
Jacksonville reaches its lowest average temperatures in January, measuring 33.4°F (0.8°C) at the peak and 21°F (-6.1°C) at the lowest.Humidity
The average relative humidity in January is 79%.Rainfall
In Jacksonville, Illinois, in January, it is raining for 7.1 days, with typically 1.69" (43mm) of accumulated precipitation. Throughout the year, in Jacksonville, there are 148.2 rainfall days, and 29.37" (746mm) of precipitation is accumulated.Snowfall
Months with snowfall in Jacksonville are January through April, October through December. January is the month with the most snowfall in Jacksonville. Snow falls for 9.6 days and accumulates 3.58" (91mm) of snow.Daylight
In January, the average length of the day in Jacksonville, Illinois, is 9h and 44min.On the first day of January, sunrise is at 7:21 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 5:18 pm CST.
Sunshine
January has the least sunshine of the year, with an average of 4.3h of sunshine.UV index
The months with the lowest UV index in Jacksonville, Illinois, are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: An average maximum UV index of 2 in January leads to these recommendations:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Frequently asked questions
What is the coldest month in Jacksonville?
How cold is it in Jacksonville in January?
What is the average humidity in January in Jacksonville?
How much does it rain in Jacksonville in January?
When does it snow the most in Jacksonville?
How many days does it snow in January in Jacksonville?
How many hours of daylight does Jacksonville have in January?
What time are sunrise and sunset in January in Jacksonville?
What is the month with the least sunshine in Jacksonville?
How long on average sun shines in January in Jacksonville?
What are the months with the lowest UV index in Jacksonville?
What is the UV index reading in January in Jacksonville?
Average temperature in January
Jacksonville, IL
- Average high temperature in January: 33.4°F
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (33.4°F).
- Average low temperature in January: 21°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (21°F).
Average pressure in January
Jacksonville, IL
- Average pressure in January: 30.15"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in January
Jacksonville, IL
- Average wind speed in January: 10.1mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.1mph).
Average humidity in January
Jacksonville, IL
- Average humidity in January: 79%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in January
Jacksonville, IL
- Average rainfall in January: 1.69"
The wettest month (with the highest rainfall) is June (3.58").
The driest month (with the least rainfall) is December (1.54").
Average rainfall days in January
Jacksonville, IL
- Average rainfall days in January: 7.1 days
The month with the highest number of rainy days is May (18 days).
The months with the least rainy days are January and February (7.1 days).
Average snowfall in January
Jacksonville, IL
- Average snowfall in January: 3.58"
The month with the highest snowfall is January (3.58").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in January
Jacksonville, IL
- Average snowfall days in January: 9.6 days
The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Jacksonville, IL
- Average daylight in January: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in January: 4h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in January
Jacksonville, IL
- Average sunshine days in January: 15.9 days
The month with the most sunshine days is December (18.5 days).
The month with the least sunshine days is June (10.5 days).
Average UV index in January
Jacksonville, IL
- Average UV index in January: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in January
Jacksonville, IL
- Average cloud cover in January: 53
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are June, July, August and September (Cloud cover 29).
Average visibility in January
Jacksonville, IL
- Average visibility in January: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Jacksonville, Illinois, USA
Weather forecast for your location
2. Allow the app to use your location
