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
Clayton's temperature records reveal January as the coldest month, marked by average highs of 32.7°F (0.4°C) and lows of 20.3°F (-6.5°C).Humidity
In January, the average relative humidity is 79%.Rainfall
January is the month with the least rainfall. Rain falls for 5.3 days and accumulates 0.98" (25mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. January is the month with the most snowfall. Snow falls for 7.8 days and accumulates 3.19" (81mm) of snow.Daylight
The average length of the day in January is 9h and 43min.On the first day of the month, sunrise is at 7:25 am and sunset at 4:48 pm. On the last day of January, sunrise is at 7:13 am and sunset at 5:21 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 are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for average individuals.Note: A maximum high UV index of 2 in January translates into the following recommendations:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. To guard against the harmful effects of the Sun, minimize exposure during midday. Opt for tightly woven and loose clothing to enhance protection from the Sun. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year?
How cold is January?
What is the average humidity in January in Clayton?
What is the driest month?
How many days does it rain in January?
When does it snow the most in Clayton?
How many days does it snow in January?
How many hours of daylight does Clayton have in January?
What time 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 in Clayton?
Average temperature in January
Clayton, IL
- Average high temperature in January: 32.7°F
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (32.7°F).
- Average low temperature in January: 20.3°F
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure in January
Clayton, 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
Clayton, IL
- Average wind speed in January: 10.2mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is July (6.3mph).
Average humidity in January
Clayton, IL
- Average humidity in January: 79%
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in January
Clayton, IL
- Average rainfall in January: 0.98"
The wettest month (with the highest rainfall) is May (3.23").
The driest month (with the least rainfall) is January (0.98").
Average rainfall days in January
Clayton, IL
- Average rainfall days in January: 5.3 days
The month with the highest number of rainy days is May (16.9 days).
The months with the least rainy days are January and February (5.3 days).
Average snowfall in January
Clayton, IL
- Average snowfall in January: 3.19"
The month with the highest snowfall is January (3.19").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Clayton, IL
- Average snowfall days in January: 7.8 days
The month with the highest number of snowfall days is January (7.8 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
Clayton, 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 2min
The months with the most sunshine are June and July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in January
Clayton, IL
- Average sunshine days in January: 20 days
The month with the most sunshine days is January (20 days).
The month with the least sunshine days is May (11.4 days).
Average UV index in January
Clayton, 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
Clayton, IL
- Average cloud cover in January: 54
The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July, August and September (Cloud cover 30).
Average visibility in January
Clayton, 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).
Clayton, Illinois, USA
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