January weather forecastWilliamson, IA
January
Weather in January
January, the same as December, in Williamson, Iowa, is a freezing cold winter month, with an average temperature fluctuating between 16°F (-8.9°C) and 29.3°F (-1.5°C).Temperature
January, marked by an average high-temperature of 29.3°F (-1.5°C) and a low-temperature of 16°F (-8.9°C), is the coldest month.Humidity
In January, the average relative humidity in Williamson, Iowa, is 82%.Rainfall
January is the month with the least rainfall in Williamson. Rain falls for 4.7 days and accumulates 0.94" (24mm) of precipitation.Snowfall
Months with snowfall in Williamson are January through May, October through December. In January, it is snowing for 10.2 days. Throughout January, 3.78" (96mm) of snow is accumulated. Throughout the year, in Williamson, there are 33.4 snowfall days, and 13.54" (344mm) of snow is accumulated.Daylight
In January, the average length of the day is 9h and 37min.On the first day of January, sunrise is at 7:38 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 5:28 pm CST.
Sunshine
With an average of 4.2h of sunshine, January has the least sunshine of the year in Williamson.UV index
The month with the lowest UV index is January, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the average person.Note: In January, the UV index of 1 transforms into the following advice:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Williamson, IA
- Average high temperature in January: 29.3°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in January: 16°F
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (16°F).
Average pressure in January
Williamson, IA
- 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 (29.89"Hg).
Average wind speed in January
Williamson, IA
- Average wind speed in January: 10.7mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity in January
Williamson, IA
- Average humidity in January: 82%
The month with the highest relative humidity is June (83%).
The month with the lowest relative humidity is October (72%).
Average rainfall in January
Williamson, IA
- Average rainfall in January: 0.94"
The wettest month (with the highest rainfall) is June (3.74").
The driest month (with the least rainfall) is January (0.94").
Average rainfall days in January
Williamson, IA
- Average rainfall days in January: 4.7 days
The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is January (4.7 days).
Average snowfall in January
Williamson, IA
- Average snowfall in January: 3.78"
The month with the highest snowfall is February (4.13").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Williamson, IA
- Average snowfall days in January: 10.2 days
The month with the highest number of snowfall days is January (10.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Williamson, 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 18min).
- Average sunshine in January: 4h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in January
Williamson, IA
- Average sunshine days in January: 17.5 days
The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is June (10.7 days).
Average UV index in January
Williamson, IA
- Average UV index in January: 1
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in January
Williamson, IA
- Average cloud cover in January: 54
The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July and August (Cloud cover 30).
Average visibility in January
Williamson, IA
- Average visibility in January: 5mi
The months with the highest visibility are February, March, April, May, June, July, September, October, November and December (6mi).
The months with the lowest visibility are January and August (5mi).
