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
Crystal Lake's January weather, marked by an average high temperature of 27°F (-2.8°C) and an average low temperature of 15.1°F (-9.4°C), is the coldest in the year.Humidity
The months with the highest humidity are January and February, with an average relative humidity of 85%.Rainfall
In January, the rain falls for 5.5 days. Throughout January, 1.1" (28mm) of precipitation is accumulated. Throughout the year, there are 146.9 rainfall days, and 21.22" (539mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. The month with the most snowfall is January, when snow falls for 12.5 days and typically aggregates up to 3.31" (84mm) of snow.Daylight
In January, the average length of the day is 9h and 31min.On the first day of January, sunrise is at 7:21 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 5:05 pm CST.
Sunshine
January has the least sunshine of the year, with an average of 3.7h of sunshine.UV index
The months with the lowest UV index in Crystal Lake are January and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: In January, the maximum UV index of 1 transforms into these recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
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 much does it rain in January?
What is the snowiest month?
How much does it snow in January?
How many hours of daylight does Crystal Lake have in January?
When are sunrise and sunset in January?
What is the month with the least sunshine?
How long on average sun shines in January?
When is the lowest UV index?
How high is the UV index in January?
Average temperature in January
Crystal Lake, IL
- Average high temperature in January: 27°F
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in January: 15.1°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure in January
Crystal Lake, IL
- Average pressure in January: 30.11"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in January
Crystal Lake, IL
- Average wind speed in January: 9.9mph
The windiest months (with the highest average wind speed) are January and February (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in January
Crystal Lake, IL
- Average humidity in January: 85%
The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are April and October (76%).
Average rainfall in January
Crystal Lake, IL
- Average rainfall in January: 1.1"
The wettest month (with the highest rainfall) is June (2.8").
The driest months (with the least rainfall) are November and December (0.94").
Average rainfall days in January
Crystal Lake, IL
- Average rainfall days in January: 5.5 days
The month with the highest number of rainy days is July (18.5 days).
The month with the least rainy days is February (4.8 days).
Average snowfall in January
Crystal Lake, IL
- Average snowfall in January: 3.31"
The month with the highest snowfall is January (3.31").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Crystal Lake, IL
- Average snowfall days in January: 12.5 days
The month with the highest number of snowfall days is January (12.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Crystal Lake, IL
- 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: 3h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in January
Crystal Lake, IL
- Average sunshine days in January: 14.4 days
The month with the most sunshine days is November (17.3 days).
The month with the least sunshine days is July (10 days).
Average UV index in January
Crystal Lake, IL
- Average UV index in January: 1
The month with the highest UV index is August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in January
Crystal Lake, IL
- Average cloud cover in January: 62
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July and September (Cloud cover 32).
Average visibility in January
Crystal Lake, IL
- Average visibility in January: 5mi
The months with the highest visibility are March, April, May, June, July, September, October, November and December (6mi).
The months with the lowest visibility are January, February and August (5mi).
Crystal Lake, Illinois, USA
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