Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The shift from November to December involves a decrease in the average high-temperature, from a chilly 43°F (6.1°C) to a subzero cold 31.5°F (-0.3°C). Grafton encounters a negligible difference from daytime peaks throughout the December nights, with a low-temperature average of 23.7°F (-4.6°C).Humidity
The average relative humidity in December is 83%.Rainfall
In Grafton, during December, the rain falls for 5.7 days and regularly aggregates up to 1.1" (28mm) of precipitation. Throughout the year, in Grafton, there are 134.9 rainfall days, and 23.94" (608mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. In Grafton, in December, during 10.9 snowfall days, 3.03" (77mm) of snow is typically accumulated. In Grafton, during the entire year, snow falls for 51.1 days and aggregates up to 13.66" (347mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 0min of daylight.On the first day of the month, sunrise is at 7:05 am and sunset at 4:17 pm. On the last day of December, in Grafton, Wisconsin, sunrise is at 7:24 am and sunset at 4:26 pm CST.
Sunshine
In December, the average sunshine is 3.9h.UV index
The months with the lowest UV index are January, November and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the average person.Note: In December, the maximum UV index of 1 suggests these recommendations:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. It's recommended to limit sun exposure when its radiation is at its peak during midday. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Frequently asked questions
How cold is December in Grafton?
What is the average humidity in December in Grafton?
How many days does it rain in December in Grafton?
How much does it snow in Grafton in December?
What is the month with the shortest days in Grafton?
What is the average length of the day in December in Grafton?
When are sunrise and sunset in December in Grafton?
How many hours of sunshine does Grafton have in December?
What are the months with the lowest UV index in Grafton?
How high is the UV index in December in Grafton?
Average temperature in December
Grafton, WI
- Average high temperature in December: 31.5°F
The warmest month (with the highest average high temperature) is July (76.1°F).
The month with the lowest average high temperature is January (25.5°F).
- Average low temperature in December: 23.7°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (15.8°F).
Average pressure in December
Grafton, WI
- Average pressure in December: 30.08"Hg
The months with the highest atmospheric pressure are January, February and March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Grafton, WI
- Average wind speed in December: 11.4mph
The windiest month (with the highest average wind speed) is January (12.1mph).
The calmest month (with the lowest average wind speed) is July (7.5mph).
Average humidity in December
Grafton, WI
- Average humidity in December: 83%
The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are April, October and November (77%).
Average rainfall in December
Grafton, WI
- Average rainfall in December: 1.1"
The wettest month (with the highest rainfall) is July (2.99").
The driest month (with the least rainfall) is February (0.98").
Average rainfall days in December
Grafton, WI
- Average rainfall days in December: 5.7 days
The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is February (3.8 days).
Average snowfall in December
Grafton, WI
- Average snowfall in December: 3.03"
The month with the highest snowfall is January (3.43").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Grafton, WI
- Average snowfall days in December: 10.9 days
The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Grafton, WI
- Average daylight in December: 9h and 0min
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 December: 3h and 5min
The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in December
Grafton, WI
- Average sunshine days in December: 16.4 days
The month with the most sunshine days is December (16.4 days).
The month with the least sunshine days is July (11.6 days).
Average UV index in December
Grafton, WI
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in December
Grafton, WI
- Average cloud cover in December: 60
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are July and August (Cloud cover 28).
Average visibility in December
Grafton, WI
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Grafton, Wisconsin, USA
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