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
During Merrimac's transition into December, the average high-temperature lessens, moving from an icy 42.1°F (5.6°C) in November to a subzero cold 28.9°F (-1.7°C). During December, Merrimac witnesses a consistent average low-temperature of 18.9°F (-7.3°C).Humidity
In December, the average relative humidity in Merrimac, Wisconsin, is 85%.Rainfall
In Merrimac, during December, the rain falls for 3.6 days and regularly aggregates up to 0.31" (8mm) of precipitation. In Merrimac, Wisconsin, during the entire year, the rain falls for 88.4 days and collects up to 7.4" (188mm) of precipitation.Snowfall
January through April, October through December are months with snowfall. In December, it is snowing for 8.9 days. Throughout December, 0.71" (18mm) of snow is accumulated. In Merrimac, Wisconsin, during the entire year, snow falls for 40 days and aggregates up to 4.76" (121mm) of snow.Daylight
With an average of 9h and 0min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:11 am and sunset at 4:23 pm. On the last day of December, sunrise is at 7:30 am and sunset at 4:32 pm CST.
Sunshine
The average sunshine in December in Merrimac, Wisconsin, is 3.7h.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 estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for average individuals.Note: A maximum UV index of 1 in December translates into the following recommendations:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Merrimac?
What is the average humidity in December in Merrimac?
How many days does it rain in December in Merrimac?
How many days does it snow in December in Merrimac?
What is the month with the shortest days in Merrimac?
What is the average length of the day in December in Merrimac?
What time are sunrise and sunset in December in Merrimac?
How long on average sun shines in December in Merrimac?
What is the month with the lowest UV index in Merrimac?
How high is the UV index in December in Merrimac?
Average temperature in December
Merrimac, WI
- Average high temperature in December: 28.9°F
The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (22.5°F).
- Average low temperature in December: 18.9°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (10°F).
Average pressure in December
Merrimac, WI
- Average pressure in December: 30.09"Hg
The months with the highest atmospheric pressure are January and February (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Merrimac, WI
- Average wind speed in December: 9.2mph
The windiest month (with the highest average wind speed) is April (9.8mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in December
Merrimac, WI
- Average humidity in December: 85%
The months with the highest relative humidity are January and February (89%).
The months with the lowest relative humidity are April and October (77%).
Average rainfall in December
Merrimac, WI
- Average rainfall in December: 0.31"
The wettest month (with the highest rainfall) is July (0.98").
The driest month (with the least rainfall) is January (0.28").
Average rainfall days in December
Merrimac, WI
- Average rainfall days in December: 3.6 days
The month with the highest number of rainy days is May (11.8 days).
The month with the least rainy days is February (2.2 days).
Average snowfall in December
Merrimac, WI
- Average snowfall in December: 0.71"
The month with the highest snowfall is January (1.38").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Merrimac, WI
- Average snowfall days in December: 8.9 days
The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Merrimac, 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 4min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).
Average sunshine days in December
Merrimac, WI
- Average sunshine days in December: 23 days
The month with the most sunshine days is January (23.2 days).
The month with the least sunshine days is June (13.8 days).
Average UV index in December
Merrimac, WI
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in December
Merrimac, WI
- Average cloud cover in December: 63
The month with the most cloud cover is January (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in December
Merrimac, WI
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
Merrimac, Wisconsin, USA
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