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
Williamsville's January weather reaches an average high of 33.1°F (0.6°C) and an average low of 20.8°F (-6.2°C), making it the coldest month.Humidity
The average relative humidity in January in Williamsville is 79%.Rainfall
In Williamsville, in January, during 5.8 rainfall days, 1.06" (27mm) of precipitation is typically accumulated. In Williamsville, during the entire year, the rain falls for 131.5 days and collects up to 18.54" (471mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. January is the month with the most snowfall in Williamsville. Snow falls for 8 days and accumulates 1.81" (46mm) of snow.Daylight
The average length of the day in January in Williamsville is 9h and 43min.On the first day of the month, sunrise is at 7:19 am and sunset at 4:43 pm. On the last day of January, in Williamsville, sunrise is at 7:07 am and sunset at 5:15 pm CST.
Sunshine
With an average of 4.1h of sunshine, January has the least sunshine of the year.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Williamsville. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In January, an average UV index of 2 transforms into the following instructions:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Frequently asked questions
What time of the year is the coldest in Williamsville?
How cold is January in Williamsville?
What is the average humidity in January in Williamsville?
How many days does it rain in January in Williamsville?
What is the snowiest month in Williamsville?
How many days does it snow in January in Williamsville?
How many hours of daylight does Williamsville have in January?
What time are sunrise and sunset in January in Williamsville?
What is the month with the least sunshine in Williamsville?
How long on average sun shines in January in Williamsville?
What is the month with the lowest UV index in Williamsville?
What is the UV index reading in January in Williamsville?
Average temperature in January
Williamsville, IL
- Average high temperature in January: 33.1°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (33.1°F).
- Average low temperature in January: 20.8°F
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).
Average pressure in January
Williamsville, 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
Williamsville, IL
- Average wind speed in January: 10.4mph
The windiest months (with the highest average wind speed) are January and April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in January
Williamsville, IL
- Average humidity in January: 79%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall in January
Williamsville, IL
- Average rainfall in January: 1.06"
The wettest month (with the highest rainfall) is June (2.36").
The driest month (with the least rainfall) is December (0.83").
Average rainfall days in January
Williamsville, IL
- Average rainfall days in January: 5.8 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is February (5.7 days).
Average snowfall in January
Williamsville, IL
- Average snowfall in January: 1.81"
The month with the highest snowfall is January (1.81").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Williamsville, IL
- Average snowfall days in January: 8 days
The month with the highest number of snowfall days is January (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
Williamsville, 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 1min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in January
Williamsville, IL
- Average sunshine days in January: 19.3 days
The month with the most sunshine days is December (20.5 days).
The month with the least sunshine days is May (11.5 days).
Average UV index in January
Williamsville, 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
Williamsville, IL
- Average cloud cover in January: 55
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are June, August and September (Cloud cover 30).
Average visibility in January
Williamsville, 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).
Williamsville, Illinois, USA
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