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
January
Weather in January
Temperature
January, having an average high-temperature of 30.6°F (-0.8°C) and an average low-temperature of 18.5°F (-7.5°C), is the coldest month.Humidity
In Washington, the average relative humidity in January is 81%.Rainfall
In Washington, during January, the rain falls for 4.4 days and regularly aggregates up to 0.98" (25mm) of precipitation. Throughout the year, there are 128.3 rainfall days, and 19.13" (486mm) of precipitation is accumulated.Snowfall
Months with snowfall in Washington, Illinois, are January through April, November and December. January is the month with the most snowfall. Snow falls for 10.3 days and accumulates 2.68" (68mm) of snow.Daylight
In January, the average length of the day is 9h and 39min.On the first day of January, sunrise is at 7:21 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 5:13 pm CST.
Sunshine
January has the least sunshine of the year, with an average of 3.9h of sunshine.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Washington. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for average individuals.Note: A daily maximum UV index of 2 in January translates into the following instructions:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year in Washington?
How cold is January in Washington?
What is the average humidity in January in Washington?
How many days does it rain in January in Washington?
What is the snowiest month in Washington?
How much does it snow in Washington in January?
How many hours of daylight does Washington have in January?
What time are sunrise and sunset in January in Washington?
What is the month with the least sunshine in Washington?
How many hours of sunshine does Washington have in January?
What is the month with the lowest UV index in Washington?
What is the UV index reading in January in Washington?
Average temperature in January
Washington, IL
- Average high temperature in January: 30.6°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 (30.6°F).
- Average low temperature in January: 18.5°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).
Average pressure in January
Washington, 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 (29.91"Hg).
Average wind speed in January
Washington, IL
- Average wind speed in January: 10.4mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in January
Washington, IL
- Average humidity in January: 81%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (71%).
Average rainfall in January
Washington, IL
- Average rainfall in January: 0.98"
The wettest month (with the highest rainfall) is May (2.6").
The driest month (with the least rainfall) is November (0.94").
Average rainfall days in January
Washington, IL
- Average rainfall days in January: 4.4 days
The month with the highest number of rainy days is July (16.4 days).
The month with the least rainy days is January (4.4 days).
Average snowfall in January
Washington, IL
- Average snowfall in January: 2.68"
The month with the highest snowfall is January (2.68").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Washington, IL
- Average snowfall days in January: 10.3 days
The month with the highest number of snowfall days is January (10.3 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
Washington, 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 18min).
- Average sunshine in January: 3h and 5min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in January
Washington, IL
- Average sunshine days in January: 18.3 days
The month with the most sunshine days is December (20.5 days).
The month with the least sunshine days is July (11.4 days).
Average UV index in January
Washington, 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
Washington, IL
- Average cloud cover in January: 58
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility in January
Washington, 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).