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
A shift in Westby's weather is observed as November turns into December, with the average high temperature reducing from a cold 41.4°F (5.2°C) to a freezing cold 27.5°F (-2.5°C). Throughout December, Westby witnesses a nighttime temperature average of 17.1°F (-8.3°C).Humidity
In Westby, the average relative humidity in December is 87%.Rainfall
In Westby, in December, it is raining for 5.3 days, with typically 1.57" (40mm) of accumulated precipitation. Throughout the year, there are 136.1 rainfall days, and 28.7" (729mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In December, in Westby, it is snowing for 12.1 days. Throughout December, 4.96" (126mm) of snow is accumulated. Throughout the year, there are 60.1 snowfall days, and 25.24" (641mm) of snow is accumulated.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 7:17 am and sunset at 4:27 pm. On the last day of December, sunrise is at 7:36 am and sunset at 4:36 pm CST.
Sunshine
In December, the average sunshine is 3.5h.UV index
January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for average individuals.Note: In December, an average UV index of 1 transforms into the following instructions:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Westby have in December?
What time are sunrise and sunset in December?
How many hours of sunshine does Westby have in December?
When is the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Westby, WI
- Average high temperature in December: 27.5°F
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (21.6°F).
- Average low temperature in December: 17.1°F
The month with the highest average low temperature is July (61.2°F).
The coldest month (with the lowest average low temperature) is January (9°F).
Average pressure in December
Westby, WI
- Average pressure in December: 30.1"Hg
The months with the highest atmospheric pressure are January and February (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Westby, WI
- Average wind speed in December: 8.7mph
The windiest month (with the highest average wind speed) is April (9.3mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in December
Westby, WI
- Average humidity in December: 87%
The month with the highest relative humidity is January (91%).
The months with the lowest relative humidity are April and October (78%).
Average rainfall in December
Westby, WI
- Average rainfall in December: 1.57"
The wettest month (with the highest rainfall) is June (4.88").
The driest month (with the least rainfall) is January (1.06").
Average rainfall days in December
Westby, WI
- Average rainfall days in December: 5.3 days
The month with the highest number of rainy days is June (18.5 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in December
Westby, WI
- Average snowfall in December: 4.96"
The month with the highest snowfall is February (6.22").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Westby, WI
- Average snowfall days in December: 12.1 days
The months with the highest number of snowfall days are January and February (13.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Westby, WI
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 3h and 3min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).
Average sunshine days in December
Westby, WI
- Average sunshine days in December: 16 days
The month with the most sunshine days is November (18.1 days).
The month with the least sunshine days is June (9.3 days).
Average UV index in December
Westby, 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, February, November and December (UV index 1).
Average cloud cover in December
Westby, WI
- Average cloud cover in December: 64
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in December
Westby, WI
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, October and November (6mi).
The month with the lowest visibility is January (4mi).
Westby, Wisconsin, USA
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