December weather forecastGreendale, WI
December
Weather in December
The first month of the winter, December, is also an icy month in Greendale, Wisconsin, with an average temperature fluctuating between 23.9°F (-4.5°C) and 32.4°F (0.2°C).Temperature
Greendale observes a minor decrease in the average high-temperature with the arrival of December, falling from November's frosty 43.7°F (6.5°C) to a wintry 32.4°F (0.2°C). Throughout December, Greendale observes a steady low-temperature average of 23.9°F (-4.5°C), reflecting a minor dip from daytime highs.Humidity
In Greendale, the average relative humidity in December is 81%.Rainfall
December is the month with the least rainfall in Greendale. Rain falls for 5.4 days and accumulates 0.79" (20mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Greendale, in December, during 9.3 snowfall days, 1.97" (50mm) of snow is typically accumulated. Throughout the year, in Greendale, there are 45.9 snowfall days, and 12.09" (307mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:04 am and sunset at 4:18 pm. On the last day of December, in Greendale, sunrise is at 7:22 am and sunset at 4:27 pm CST.
Sunshine
In December, the average sunshine is 4h.UV index
The months with the lowest UV index are January 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 average individuals.Note: The maximum daily UV index of 1 during December translates into the following directions:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Always opt for UVA and UVB-resistant sunglasses on radiant days. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Greendale, WI
- Average high temperature in December: 32.4°F
The warmest month (with the highest average high temperature) is July (78.3°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in December: 23.9°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (16°F).
Average pressure in December
Greendale, WI
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Greendale, WI
- Average wind speed in December: 10.4mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in December
Greendale, WI
- Average humidity in December: 81%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (75%).
Average rainfall in December
Greendale, WI
- Average rainfall in December: 0.79"
The wettest month (with the highest rainfall) is July (2.6").
The driest month (with the least rainfall) is December (0.79").
Average rainfall days in December
Greendale, WI
- Average rainfall days in December: 5.4 days
The month with the highest number of rainy days is July (16.7 days).
The month with the least rainy days is February (3.2 days).
Average snowfall in December
Greendale, WI
- Average snowfall in December: 1.97"
The month with the highest snowfall is January (3.23").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Greendale, WI
- Average snowfall days in December: 9.3 days
The month with the highest number of snowfall days is January (13 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Greendale, WI
- Average daylight in December: 9h and 6min
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 December: 4h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in December
Greendale, WI
- Average sunshine days in December: 17.5 days
The month with the most sunshine days is November (18.2 days).
The month with the least sunshine days is July (11.4 days).
Average UV index in December
Greendale, 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 and December (UV index 1).
Average cloud cover in December
Greendale, 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 29).
Average visibility in December
Greendale, 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).
