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 brings the lowest temperatures, with an average high of 33.4°F (0.8°C) and an average low of 21.4°F (-5.9°C).Humidity
In January, the average relative humidity is 79%.Rainfall
In Rochester, in January, it is raining for 6.8 days, with typically 1.38" (35mm) of accumulated precipitation. Throughout the year, in Rochester, Illinois, there are 141.7 rainfall days, and 22.72" (577mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In January, it is snowing for 8.3 days. Throughout January, 1.54" (39mm) of snow is accumulated. In Rochester, during the entire year, snow falls for 27.9 days and aggregates up to 6.14" (156mm) of snow.Daylight
In Rochester, Illinois, the average length of the day in January is 9h and 44min.On the first day of January in Rochester, Illinois, sunrise is at 7:19 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 5:15 pm CST.
Sunshine
The month with the least sunshine is January, with an average of 4.2h 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 Rochester. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: A daily maximum UV index of 2 in January translates into the following instructions:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Frequently asked questions
What time of the year is the coldest in Rochester?
How cold is it in Rochester in January?
What is the average humidity in January in Rochester?
How many days does it rain in January in Rochester?
How much does it snow in Rochester in January?
What is the average length of the day in January in Rochester?
When is the sunrise / sunset in January in Rochester?
What is the month with the least sunshine in Rochester?
How long on average sun shines in January in Rochester?
When is the lowest UV index in Rochester?
What is the UV index intensity in January in Rochester?
Average temperature in January
Rochester, IL
- Average high temperature in January: 33.4°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 (33.4°F).
- Average low temperature in January: 21.4°F
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (21.4°F).
Average pressure in January
Rochester, 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 (29.92"Hg).
Average wind speed in January
Rochester, IL
- Average wind speed in January: 10.4mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in January
Rochester, 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
Rochester, IL
- Average rainfall in January: 1.38"
The wettest month (with the highest rainfall) is April (2.64").
The driest month (with the least rainfall) is December (1.14").
Average rainfall days in January
Rochester, IL
- Average rainfall days in January: 6.8 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (6.2 days).
Average snowfall in January
Rochester, IL
- Average snowfall in January: 1.54"
The month with the highest snowfall is February (1.85").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Rochester, IL
- Average snowfall days in January: 8.3 days
The month with the highest number of snowfall days is January (8.3 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
Rochester, IL
- Average daylight in January: 9h and 4min
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 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 12min).
Average sunshine days in January
Rochester, IL
- Average sunshine days in January: 16.8 days
The month with the most sunshine days is October (18.7 days).
The month with the least sunshine days is July (11 days).
Average UV index in January
Rochester, 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
Rochester, 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 29).
Average visibility in January
Rochester, 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).
Rochester, Illinois, USA
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