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 proves to be the coldest month, recording an average maximum temperature of 21.6°F (-5.8°C) and a minimum temperature of 9°F (-12.8°C).Humidity
January is the most humid month, with an average relative humidity of 90%.Rainfall
The month with the least rainfall in Grafton, Iowa, is January, when the rain falls for 4.5 days and typically collects 0.94" (24mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Grafton, in January, snow falls for 13.8 days, with typically accumulated 4.84" (123mm) of snow. In Grafton, during the entire year, snow falls for 57 days and aggregates up to 22.83" (580mm) of snow.Daylight
In January, the average length of the day is 9h and 25min.On the first day of January in Grafton, sunrise is at 7:44 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 5:22 pm CST.
Sunshine
January has the least sunshine of the year, with an average of 3.4h of sunshine.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for the average person.Note: The maximum UV index of 1 during January translates into these guidelines:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the coldest months?
How cold is January?
What is the most humid month?
What is the average humidity in January?
What is the driest month?
How much does it rain in January?
How many days does it snow in January?
How many hours of daylight does Grafton have in January?
What time are sunrise and sunset in January?
What is the month with the least sunshine?
How many hours of sunshine does Grafton have in January?
What is the month with the lowest UV index?
What is the UV index intensity in January?
Average temperature in January
Grafton, IA
- Average high temperature in January: 21.6°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 (21.6°F).
- Average low temperature in January: 9°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 (9°F).
Average pressure in January
Grafton, IA
- Average pressure in January: 30.14"Hg
The months with the highest atmospheric pressure are January and February (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in January
Grafton, IA
- Average wind speed in January: 10.7mph
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 (7.4mph).
Average humidity in January
Grafton, IA
- Average humidity in January: 90%
The month with the highest relative humidity is January (90%).
The months with the lowest relative humidity are April and October (72%).
Average rainfall in January
Grafton, IA
- Average rainfall in January: 0.94"
The wettest month (with the highest rainfall) is June (4.13").
The driest month (with the least rainfall) is January (0.94").
Average rainfall days in January
Grafton, IA
- Average rainfall days in January: 4.5 days
The month with the highest number of rainy days is June (18.4 days).
The month with the least rainy days is February (2.9 days).
Average snowfall in January
Grafton, IA
- Average snowfall in January: 4.84"
The month with the highest snowfall is February (5.94").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Grafton, IA
- Average snowfall days in January: 13.8 days
The month with the highest number of snowfall days is January (13.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Grafton, IA
- Average daylight in January: 9h and 2min
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 0min).
- Average sunshine in January: 3h and 2min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in January
Grafton, IA
- Average sunshine days in January: 14.1 days
The month with the most sunshine days is October (18.1 days).
The month with the least sunshine days is June (9.1 days).
Average UV index in January
Grafton, 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, February, November and December (UV index 1).
Average cloud cover in January
Grafton, IA
- Average cloud cover in January: 65
The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in January
Grafton, IA
- Average visibility in January: 5mi
The months with the highest visibility are March, April, May, June, September, October and November (6mi).
The months with the lowest visibility are January, February, July, August and December (5mi).
Grafton, Iowa, USA
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