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
Prairie du Rocher's coldest month, January, generally records average temperatures ranging from a high of 39.6°F (4.2°C) to a low of 25.9°F (-3.4°C).Humidity
In Prairie du Rocher, the average relative humidity in January is 74%.Rainfall
In Prairie du Rocher, in January, it is raining for 7.3 days, with typically 2.13" (54mm) of accumulated precipitation. Throughout the year, there are 145 rainfall days, and 32.24" (819mm) of precipitation is accumulated.Snowfall
Months with snowfall in Prairie du Rocher are January through March, November and December. The months with the most snowfall are January and February, with an average 2.36" (60mm) of accumulated snow.Daylight
In January, the average length of the day is 9h and 53min.On the first day of the month, sunrise is at 7:16 am and sunset at 4:51 pm. On the last day of January, sunrise is at 7:05 am and sunset at 5:21 pm CST.
Sunshine
January has the least sunshine of the year, with an average of 4.6h of sunshine.UV index
January, February and December, with an average maximum UV index of 2, 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 ordinary individuals.Note: The maximum daily UV index, 2 in January, converts into the following recommendations:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
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 average humidity in January?
How much does it rain in January?
What is the snowiest month?
How many days does it snow in January?
How many hours of daylight does Prairie du Rocher have in January?
When are sunrise and sunset in January?
What is the month with the least sunshine?
How many hours of sunshine does Prairie du Rocher have in January?
What is the month with the lowest UV index?
What is the UV index reading in January?
Average temperature in January
Prairie du Rocher, IL
- Average high temperature in January: 39.6°F
The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is January (39.6°F).
- Average low temperature in January: 25.9°F
The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (25.9°F).
Average pressure in January
Prairie du Rocher, IL
- Average pressure in January: 30.16"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in January
Prairie du Rocher, IL
- Average wind speed in January: 9.4mph
The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in January
Prairie du Rocher, IL
- Average humidity in January: 74%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in January
Prairie du Rocher, IL
- Average rainfall in January: 2.13"
The wettest month (with the highest rainfall) is May (3.86").
The driest months (with the least rainfall) are February and September (1.81").
Average rainfall days in January
Prairie du Rocher, IL
- Average rainfall days in January: 7.3 days
The month with the highest number of rainy days is July (16.3 days).
The month with the least rainy days is January (7.3 days).
Average snowfall in January
Prairie du Rocher, IL
- Average snowfall in January: 2.36"
The months with the highest snowfall are January and February (2.36").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in January
Prairie du Rocher, IL
- Average snowfall days in January: 5.7 days
The month with the highest number of snowfall days is January (5.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in January /
Average sunshine in January
Prairie du Rocher, IL
- Average daylight in January: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January: 4h and 4min
The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in January
Prairie du Rocher, IL
- Average sunshine days in January: 17.9 days
The month with the most sunshine days is December (19.7 days).
The month with the least sunshine days is July (12.3 days).
Average UV index in January
Prairie du Rocher, IL
- Average UV index in January: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in January
Prairie du Rocher, IL
- Average cloud cover in January: 49
The months with the most cloud cover are January and February (Cloud cover 49).
The months with the least cloud cover are June and August (Cloud cover 28).
Average visibility in January
Prairie du Rocher, IL
- Average visibility in January: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Prairie du Rocher, Illinois, USA
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