January weather forecastSully, IA
January
Weather in January
January, like December, is another subzero cold winter month in Sully, Iowa, with an average temperature ranging between max 27.1°F (-2.7°C) and min 14.4°F (-9.8°C).Temperature
Temperature records mark January as the coldest month, with highs averaging 27.1°F (-2.7°C) and lows at 14.4°F (-9.8°C).Humidity
January is the most humid month, with an average relative humidity of 84%.Rainfall
The months with the least rainfall in Sully are January, February and December Rain falls for 3.8 days and accumulates 0.39" (10mm) of rain.Snowfall
January through May, October through December are months with snowfall in Sully. The month with the most snowfall is January, when snow falls for 8.4 days and typically aggregates up to 1.73" (44mm) of snow.Daylight
The average length of the day in January in Sully is 9h and 35min.On the first day of the month, sunrise is at 7:37 am and sunset at 4:51 pm. On the last day of January, in Sully, sunrise is at 7:24 am and sunset at 5:25 pm CST.
Sunshine
With an average of 4.2h of sunshine, January has the least sunshine of the year in Sully.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index in Sully, Iowa. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for average individuals.Note: A daily maximum UV index of 1 in January translates into the following instructions:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Sully, IA
- Average high temperature in January: 27.1°F
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (27.1°F).
- Average low temperature in January: 14.4°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (14.4°F).
Average pressure in January
Sully, IA
- 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 (29.89"Hg).
Average wind speed in January
Sully, IA
- Average wind speed in January: 10.5mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in January
Sully, IA
- Average humidity in January: 84%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (71%).
Average rainfall in January
Sully, IA
- Average rainfall in January: 0.39"
The wettest month (with the highest rainfall) is May (2.13").
The driest months (with the least rainfall) are January, February and December (0.39").
Average rainfall days in January
Sully, IA
- Average rainfall days in January: 3.8 days
The month with the highest number of rainy days is May (14.7 days).
The month with the least rainy days is February (3.4 days).
Average snowfall in January
Sully, IA
- Average snowfall in January: 1.73"
The month with the highest snowfall is January (1.73").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Sully, IA
- Average snowfall days in January: 8.4 days
The month with the highest number of snowfall days is January (8.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Sully, IA
- Average daylight in January: 9h and 36min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January: 4h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in January
Sully, IA
- Average sunshine days in January: 21.8 days
The month with the most sunshine days is December (22.9 days).
The month with the least sunshine days is June (12.2 days).
Average UV index in January
Sully, IA
- Average UV index in January: 1
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in January
Sully, IA
- 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 July and September (Cloud cover 30).
Average visibility in January
Sully, IA
- 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).
