December weather forecast
Monticello, WI

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Weather in December

December, the first month of the winter in Monticello, is also a subzero cold month, with an average temperature ranging between max 30.7°F (-0.7°C) and min 20.8°F (-6.2°C).

Temperature

December's arrival correlates with a reduction in the average high-temperature, down from a chilly 42.8°F (6°C) in November to a subzero cold 30.7°F (-0.7°C). Monticello in December anticipates an average nighttime temperature of 20.8°F (-6.2°C).

Humidity

In December, the average relative humidity is 84%.

Rainfall

In Monticello, in December, during 5.8 rainfall days, 0.71" (18mm) of precipitation is typically accumulated. Throughout the year, there are 124.7 rainfall days, and 15.16" (385mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In Monticello, during December, snow falls for 9.4 days and regularly aggregates up to 1.34" (34mm) of snow. Throughout the year, there are 48 snowfall days, and 10.43" (265mm) 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 7:09 am and sunset at 4:25 pm. On the last day of December, sunrise is at 7:28 am and sunset at 4:34 pm CST.

Sunshine

In December, the average sunshine is 3.9h.

UV index

January, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Monticello. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: The daily high UV index of 1 during December translates into the following recommendations:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Updated: Jul 27, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

December temperatures in Monticello vary between a high-temperature of 30.7°F (-0.7°C) and a low-temperature of 20.8°F (-6.2°C).

What is the average humidity in December?

In Monticello, the average relative humidity in December is 84%.

How many days does it rain in December?

In Monticello, in December, during 5.8 rainfall days, 0.71" (18mm) of precipitation is typically accumulated.

How much does it snow in December?

In December, it is snowing for 9.4 days. Throughout December, 1.34" (34mm) of snow is accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 6min of daylight.

What is the average length of the day in December?

The average day length in December is 9h and 6min.

When are sunrise and sunset in December in Monticello?

In December, on the first day of the month, sunrise is at 7:09 am and sunset at 4:25 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:34 pm CST.

How long on average sun shines in December?

In December, the average sunshine duration is 3.9h.

What are the months with the lowest UV index?

The months with the lowest UV index are January, November and December, with an average maximum UV index of 1.

What is the UV index reading in December?

In Monticello, the average daily maximum UV index in December is 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Monticello, WI

Average temperature in December - Monticello, WI
  • Average high temperature in December: 30.7°F

The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (24.4°F).

  • Average low temperature in December: 20.8°F

The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (11.7°F).

Average pressure in December
Monticello, WI

Average pressure in December - Monticello, 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
Monticello, WI

Average wind speed in December - Monticello, WI
  • Average wind speed in December: 9.5mph

The windiest month (with the highest average wind speed) is April (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).

Average humidity in December
Monticello, WI

Average humidity in December - Monticello, WI
  • Average humidity in December: 84%

The month with the highest relative humidity is January (89%).
The months with the lowest relative humidity are April and October (77%).

Average rainfall in December
Monticello, WI

Average rainfall in December - Monticello, WI
  • Average rainfall in December: 0.71"

The wettest month (with the highest rainfall) is June (2.32").
The driest month (with the least rainfall) is January (0.55").

Average rainfall days in December
Monticello, WI

Average rainfall days in December - Monticello, WI
  • Average rainfall days in December: 5.8 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is February (3.5 days).

Average snowfall in December
Monticello, WI

Average snowfall in December - Monticello, WI
  • Average snowfall in December: 1.34"

The months with the highest snowfall are January and February (2.52").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Monticello, WI

Average snowfall days in December - Monticello, WI
  • Average snowfall days in December: 9.4 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
Monticello, WI

Average daylight in December / Average sunshine in December - Monticello, WI
  • Average daylight in December: 9h and 1min

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: 3h and 5min

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 December
Monticello, WI

Average sunshine days in December - Monticello, WI
  • Average sunshine days in December: 18.6 days

The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is June (10.3 days).

Average UV index in December
Monticello, WI

Average UV index in December - Monticello, WI
  • Average UV index in December: 1

The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).

Average cloud cover in December
Monticello, WI

Average cloud cover in December - Monticello, WI
  • Average cloud cover in December: 61

The month with the most cloud cover is January (Cloud cover 65).
The months with the least cloud cover are August and September (Cloud cover 34).

Average visibility in December
Monticello, WI

Average visibility in December - Monticello, WI
  • Average visibility in December: 6mi

The months with the highest visibility are February, March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, July, August and September (5mi).

Monticello, Wisconsin, USA

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