January weather forecastMartinsville, IL
January
Weather in January
January, like December, in Martinsville, Illinois, is another cold winter month, with an average temperature ranging between max 34.7°F (1.5°C) and min 22.6°F (-5.2°C).Temperature
The month of January, characterized by an average high of 34.7°F (1.5°C) and a low of 22.6°F (-5.2°C), is recognized as the coldest.Humidity
The average relative humidity in January is 79%.Rainfall
In Martinsville, during January, the rain falls for 6.4 days and regularly aggregates up to 0.75" (19mm) of precipitation. Throughout the year, there are 115.9 rainfall days, and 11.26" (286mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall in Martinsville. In Martinsville, in January, during 5.8 snowfall days, 0.43" (11mm) of snow is typically accumulated. In Martinsville, during the entire year, snow falls for 18.9 days and aggregates up to 1.73" (44mm) of snow.Daylight
In Martinsville, Illinois, the average length of the day in January is 9h and 46min.On the first day of the month, sunrise is at 7:11 am and sunset at 4:38 pm. On the last day of January, in Martinsville, sunrise is at 6:59 am and sunset at 5:10 pm CST.
Sunshine
The month with the least sunshine is January, with an average of 4.1h of sunshine.UV index
In Martinsville, the average daily maximum UV index in January is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 2 during January translates into the following guidance:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Martinsville, IL
- Average high temperature in January: 34.7°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (34.7°F).
- Average low temperature in January: 22.6°F
The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).
Average pressure in January
Martinsville, 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 (29.93"Hg).
Average wind speed in January
Martinsville, IL
- Average wind speed in January: 10.4mph
The windiest months (with the highest average wind speed) are January and February (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.1mph).
Average humidity in January
Martinsville, IL
- Average humidity in January: 79%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in January
Martinsville, IL
- Average rainfall in January: 0.75"
The wettest month (with the highest rainfall) is April (1.54").
The driest month (with the least rainfall) is February (0.47").
Average rainfall days in January
Martinsville, IL
- Average rainfall days in January: 6.4 days
The month with the highest number of rainy days is May (14.9 days).
The month with the least rainy days is February (6 days).
Average snowfall in January
Martinsville, IL
- Average snowfall in January: 0.43"
The month with the highest snowfall is December (0.47").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Martinsville, IL
- Average snowfall days in January: 5.8 days
The month with the highest number of snowfall days is January (5.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in January /
Average sunshine in January
Martinsville, IL
- Average daylight in January: 9h and 48min
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 6min
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
Martinsville, IL
- Average sunshine days in January: 20.6 days
The month with the most sunshine days is October (21.2 days).
The month with the least sunshine days is May (12.4 days).
Average UV index in January
Martinsville, IL
- Average UV index in January: 2
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in January
Martinsville, IL
- Average cloud cover in January: 55
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is June (Cloud cover 30).
Average visibility in January
Martinsville, IL
- Average visibility in January: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
