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 31.6°F (-0.2°C) at the peak and 19.8°F (-6.8°C) at the base.Humidity
The average relative humidity in January is 80%.Rainfall
In January, the rain falls for 6.6 days. Throughout January, 0.98" (25mm) of precipitation is accumulated. Throughout the year, in McLean, there are 135 rainfall days, and 17.72" (450mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall in McLean. The month with the most snowfall in McLean is January, when snow falls for 9.5 days and typically aggregates up to 2.2" (56mm) of snow.Daylight
In January, the average length of the day is 9h and 41min.On the first day of January in McLean, sunrise is at 7:19 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 5:13 pm CST.
Sunshine
With an average of 4h of sunshine, January has the least sunshine of the year.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for the ordinary person.Note: In January, a daily UV index of 2 turns into the following recommendations:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the coldest months in McLean?
How cold is January in McLean?
What is the average humidity in January in McLean?
How much does it rain in McLean in January?
What is the snowiest month in McLean?
How much does it snow in McLean in January?
How many hours of daylight does McLean have in January?
When is the sunrise / sunset in January in McLean?
What is the month with the least sunshine in McLean?
How long on average sun shines in January in McLean?
What are the months with the lowest UV index in McLean?
What is the UV index reading in January in McLean?
Average temperature in January
McLean, IL
- Average high temperature in January: 31.6°F
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (31.6°F).
- Average low temperature in January: 19.8°F
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in January
McLean, IL
- Average pressure in January: 30.14"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in January
McLean, IL
- Average wind speed in January: 10.5mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in January
McLean, IL
- Average humidity in January: 80%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (70%).
Average rainfall in January
McLean, IL
- Average rainfall in January: 0.98"
The wettest month (with the highest rainfall) is May (2.2").
The driest month (with the least rainfall) is December (0.87").
Average rainfall days in January
McLean, IL
- Average rainfall days in January: 6.6 days
The month with the highest number of rainy days is May (16.5 days).
The month with the least rainy days is February (5.9 days).
Average snowfall in January
McLean, IL
- Average snowfall in January: 2.2"
The month with the highest snowfall is January (2.2").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
McLean, IL
- Average snowfall days in January: 9.5 days
The month with the highest number of snowfall days is January (9.5 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
McLean, IL
- Average daylight in January: 9h and 4min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in January: 4h and 0min
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 0min).
Average sunshine days in January
McLean, IL
- Average sunshine days in January: 18.8 days
The months with the most sunshine days are November and December (20 days).
The month with the least sunshine days is May (11.6 days).
Average UV index in January
McLean, 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
McLean, IL
- Average cloud cover in January: 57
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility in January
McLean, 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).
McLean, Illinois, USA
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