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, on average, is the coldest month, registering a high temperature of 36.1°F (2.3°C) and a low of 23.4°F (-4.8°C).Humidity
The average relative humidity in January is 76%.Rainfall
In Grafton, in January, during 6.3 rainfall days, 1.46" (37mm) of precipitation is typically accumulated. In Grafton, during the entire year, the rain falls for 138.8 days and collects up to 27.6" (701mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. The months with the most snowfall in Grafton are January and February, with an average 1.54" (39mm) of accumulated snow.Daylight
In Grafton, Illinois, the average length of the day in January is 9h and 48min.On the first day of the month, sunrise is at 7:20 am and sunset at 4:49 pm. On the last day of January, sunrise is at 7:08 am and sunset at 5:21 pm CST.
Sunshine
January and February, with an average of 4.6h of sunshine, are months with the least sunshine in Grafton.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Grafton, Illinois. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for average individuals.Note: A typical high UV index of 2 in January suggests the following recommendations:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the coldest in Grafton?
How cold is it in Grafton in January?
What is the average humidity in January in Grafton?
How many days does it rain in January in Grafton?
When does it snow the most in Grafton?
How many days does it snow in January in Grafton?
What is the average length of the day in January in Grafton?
What time are sunrise and sunset in January in Grafton?
What is the month with the least sunshine in Grafton?
How long on average sun shines in January in Grafton?
What are the months with the lowest UV index in Grafton?
How high is the UV index in January in Grafton?
Average temperature in January
Grafton, IL
- Average high temperature in January: 36.1°F
The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in January: 23.4°F
The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in January
Grafton, 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 (29.92"Hg).
Average wind speed in January
Grafton, IL
- Average wind speed in January: 9.4mph
The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).
Average humidity in January
Grafton, 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
Grafton, IL
- Average rainfall in January: 1.46"
The wettest month (with the highest rainfall) is May (3.35").
The driest month (with the least rainfall) is February (1.3").
Average rainfall days in January
Grafton, IL
- Average rainfall days in January: 6.3 days
The month with the highest number of rainy days is July (16.3 days).
The month with the least rainy days is January (6.3 days).
Average snowfall in January
Grafton, IL
- Average snowfall in January: 1.54"
The months with the highest snowfall are January and February (1.54").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in January
Grafton, IL
- Average snowfall days in January: 5.7 days
The month with the highest number of snowfall days is January (5.7 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
Grafton, IL
- Average daylight in January: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in January: 4h and 4min
The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).
Average sunshine days in January
Grafton, IL
- Average sunshine days in January: 19.3 days
The month with the most sunshine days is December (19.8 days).
The month with the least sunshine days is June (11.2 days).
Average UV index in January
Grafton, IL
- Average UV index in January: 2
The months with the highest UV index are May, 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
Grafton, IL
- Average cloud cover in January: 51
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in January
Grafton, 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).
Grafton, Illinois, USA
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