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, known for its average high temperature of 38.8°F (3.8°C) and an average low temperature of 25.7°F (-3.5°C), is the coldest month.Humidity
In January, the average relative humidity in Saint Johns is 76%.Rainfall
The month with the least rainfall is January, when the rain falls for 8.4 days and typically collects 1.5" (38mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In Saint Johns, in January, during 5.4 snowfall days, 1.18" (30mm) of snow is typically accumulated. Throughout the year, there are 18 snowfall days, and 4.53" (115mm) of snow is accumulated.Daylight
In January, the average length of the day is 9h and 53min.On the first day of January in Saint Johns, sunrise is at 7:12 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 5:18 pm CST.
Sunshine
With an average of 4.6h 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. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: A typical high UV index of 2 in January suggests the following recommendations:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
Frequently asked questions
What month is the coldest in Saint Johns?
How cold is January in Saint Johns?
What is the average humidity in January in Saint Johns?
What is the driest month in Saint Johns?
How much does it rain in Saint Johns in January?
How many days does it snow in January in Saint Johns?
How many hours of daylight does Saint Johns have in January?
When are sunrise and sunset in January in Saint Johns?
What is the month with the least sunshine in Saint Johns?
How many hours of sunshine does Saint Johns have in January?
What are the months with the lowest UV index in Saint Johns?
How high is the UV index in January in Saint Johns?
Average temperature in January
Saint Johns, IL
- Average high temperature in January: 38.8°F
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (38.8°F).
- Average low temperature in January: 25.7°F
The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in January
Saint Johns, IL
- Average pressure in January: 30.16"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in January
Saint Johns, IL
- Average wind speed in January: 9.6mph
The windiest months (with the highest average wind speed) are January and February (9.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in January
Saint Johns, IL
- Average humidity in January: 76%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in January
Saint Johns, IL
- Average rainfall in January: 1.5"
The wettest month (with the highest rainfall) is April (3.58").
The driest month (with the least rainfall) is January (1.5").
Average rainfall days in January
Saint Johns, IL
- Average rainfall days in January: 8.4 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is December (8.2 days).
Average snowfall in January
Saint Johns, IL
- Average snowfall in January: 1.18"
The month with the highest snowfall is February (1.5").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Saint Johns, IL
- Average snowfall days in January: 5.4 days
The month with the highest number of snowfall days is January (5.4 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
Saint Johns, IL
- Average daylight in January: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January: 4h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in January
Saint Johns, IL
- Average sunshine days in January: 18.1 days
The months with the most sunshine days are October and November (19.5 days).
The month with the least sunshine days is May (11.4 days).
Average UV index in January
Saint Johns, 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
Saint Johns, IL
- Average cloud cover in January: 50
The months with the most cloud cover are January and February (Cloud cover 50).
The month with the least cloud cover is June (Cloud cover 28).
Average visibility in January
Saint Johns, 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).
Saint Johns, Illinois, USA
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