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
Sumner experiences its lowest temperatures in January, with an average peak of 23.5°F (-4.7°C) and a low of 11.1°F (-11.6°C).Humidity
January and February, with an average relative humidity of 88%, are the most humid months in Sumner.Rainfall
January is the month with the least rainfall in Sumner. Rain falls for 4.3 days and accumulates 1.14" (29mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Sumner, in January, during 13.6 snowfall days, 5.31" (135mm) of snow is typically accumulated. In Sumner, during the entire year, snow falls for 55.9 days and aggregates up to 23.46" (596mm) of snow.Daylight
In January, the average length of the day in Sumner, Iowa, is 9h and 28min.On the first day of January in Sumner, sunrise is at 7:39 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 5:19 pm CST.
Sunshine
January has the least sunshine of the year in Sumner, with an average of 3.6h of sunshine.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index in Sumner, Iowa. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the average person.Note: In January, the maximum UV index of 1 translates into these guidelines:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. It's recommended to limit sun exposure when its radiation is at its peak during midday. Opt for tightly woven and loose clothing to enhance protection from the Sun. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Frequently asked questions
What are the coldest months in Sumner?
How cold is January in Sumner?
What is the most humid month in Sumner?
What is the average humidity in January in Sumner?
What is the driest month in Sumner?
How many days does it rain in January in Sumner?
How many days does it snow in January in Sumner?
How many hours of daylight does Sumner have in January?
When is the sunrise / sunset in January in Sumner?
What is the month with the least sunshine in Sumner?
How many hours of sunshine does Sumner have in January?
What is the month with the lowest UV index in Sumner?
How high is the UV index in January in Sumner?
Average temperature in January
Sumner, IA
- Average high temperature in January: 23.5°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (23.5°F).
- Average low temperature in January: 11.1°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (11.1°F).
Average pressure in January
Sumner, IA
- Average pressure in January: 30.14"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in January
Sumner, IA
- Average wind speed in January: 10.6mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity in January
Sumner, IA
- Average humidity in January: 88%
The months with the highest relative humidity are January and February (88%).
The month with the lowest relative humidity is October (73%).
Average rainfall in January
Sumner, IA
- Average rainfall in January: 1.14"
The wettest month (with the highest rainfall) is June (5.04").
The driest month (with the least rainfall) is January (1.14").
Average rainfall days in January
Sumner, IA
- Average rainfall days in January: 4.3 days
The month with the highest number of rainy days is May (20.3 days).
The months with the least rainy days are January and February (4.3 days).
Average snowfall in January
Sumner, IA
- Average snowfall in January: 5.31"
The month with the highest snowfall is February (5.83").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Sumner, IA
- Average snowfall days in January: 13.6 days
The month with the highest number of snowfall days is January (13.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Sumner, IA
- Average daylight in January: 9h and 3min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in January: 3h and 4min
The months with the most sunshine are July and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in January
Sumner, IA
- Average sunshine days in January: 14 days
The month with the most sunshine days is November (16.8 days).
The month with the least sunshine days is June (7.3 days).
Average UV index in January
Sumner, IA
- Average UV index in January: 1
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in January
Sumner, IA
- Average cloud cover in January: 62
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are August and September (Cloud cover 32).
Average visibility in January
Sumner, IA
- Average visibility in January: 5mi
The months with the highest visibility are March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February and July (5mi).
Sumner, Iowa, USA
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