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, with average temperatures reaching a high of 28.4°F (-2°C) and a low of 16.7°F (-8.5°C), is the coldest month.Humidity
The months with the highest humidity are January, February, July and August, with an average relative humidity of 83%.Rainfall
In Boulder Hill, in January, during 5 rainfall days, 0.87" (22mm) of precipitation is typically accumulated. In Boulder Hill, during the entire year, the rain falls for 133.1 days and collects up to 16.93" (430mm) of precipitation.Snowfall
Months with snowfall in Boulder Hill are January through April, October through December. January is the month with the most snowfall in Boulder Hill. Snow falls for 10.7 days and accumulates 1.73" (44mm) of snow.Daylight
In Boulder Hill, the average length of the day in January is 9h and 34min.On the first day of January in Boulder Hill, sunrise is at 7:20 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 5:06 pm CST.
Sunshine
January has the least sunshine of the year, with an average of 3.8h of sunshine.UV index
The months with the lowest UV index in Boulder Hill, Illinois, are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for average individuals.Note: During January, 1 as the daily maximum UV index converts into the following advice:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. Avoiding the Sun during its peak radiation time around midday is a healthy practice. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month in Boulder Hill?
How cold is January in Boulder Hill?
What is the most humid month in Boulder Hill?
What is the average humidity in January in Boulder Hill?
How much does it rain in Boulder Hill in January?
What is the snowiest month in Boulder Hill?
How much does it snow in Boulder Hill in January?
How many hours of daylight does Boulder Hill have in January?
When are sunrise and sunset in January in Boulder Hill?
What is the month with the least sunshine in Boulder Hill?
How long on average sun shines in January in Boulder Hill?
What are the months with the lowest UV index in Boulder Hill?
What is the UV index reading in January in Boulder Hill?
Average temperature in January
Boulder Hill, IL
- Average high temperature in January: 28.4°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (28.4°F).
- Average low temperature in January: 16.7°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).
Average pressure in January
Boulder Hill, 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
Boulder Hill, IL
- Average wind speed in January: 9.6mph
The windiest month (with the highest average wind speed) is April (9.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in January
Boulder Hill, IL
- Average humidity in January: 83%
The months with the highest relative humidity are January, February, July and August (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall in January
Boulder Hill, IL
- Average rainfall in January: 0.87"
The wettest month (with the highest rainfall) is June (2.24").
The driest months (with the least rainfall) are November and December (0.75").
Average rainfall days in January
Boulder Hill, IL
- Average rainfall days in January: 5 days
The month with the highest number of rainy days is July (16.6 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in January
Boulder Hill, IL
- Average snowfall in January: 1.73"
The month with the highest snowfall is January (1.73").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in January
Boulder Hill, IL
- Average snowfall days in January: 10.7 days
The month with the highest number of snowfall days is January (10.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Boulder Hill, IL
- Average daylight in January: 9h and 4min
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 5min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in January
Boulder Hill, IL
- Average sunshine days in January: 17 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (10.2 days).
Average UV index in January
Boulder Hill, IL
- Average UV index in January: 1
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in January
Boulder Hill, IL
- Average cloud cover in January: 60
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility in January
Boulder Hill, 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).
Boulder Hill, Illinois, USA
Weather forecast for your location
2. Allow the app to use your location