December weather forecast
Lancaster, WI

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Weather in December

The first month of the winter, December, is also a subzero cold month in Lancaster, Wisconsin, with an average temperature varying between 19.9°F (-6.7°C) and 30.2°F (-1°C).

Temperature

The arrival of December indicates a decrease in the average high-temperature, moving from a frosty 43.2°F (6.2°C) in November to a freezing cold 30.2°F (-1°C). During the month of December, the temperature generally drops to a low average of 19.9°F (-6.7°C).

Humidity

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

Rainfall

In Lancaster, in December, it is raining for 5.5 days, with typically 1.42" (36mm) of accumulated precipitation. Throughout the year, there are 134.2 rainfall days, and 27.32" (694mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, October through December. In Lancaster, during December, snow falls for 9.4 days and regularly aggregates up to 3.54" (90mm) of snow. Throughout the year, there are 46.7 snowfall days, and 19.49" (495mm) 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 December, sunrise is at 7:14 am and sunset at 4:29 pm. On the last day of the month, sunrise is at 7:33 am and sunset at 4:38 pm CST.

Sunshine

In Lancaster, the average sunshine in December is 4h.

UV index

January, 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 the average person.
Note: The UV index of 1 during December translates into the following guidance:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.

Frequently asked questions

How cold is it in December?

Lancaster in December has an average high-temperature of 30.2°F (-1°C) and an average low-temperature of 19.9°F (-6.7°C).

What is the average humidity in December in Lancaster?

In December, the average relative humidity is 84%.

How much does it rain in December?

In Lancaster, during December, the rain falls for 5.5 days and regularly aggregates up to 1.42" (36mm) of precipitation.

How many days does it snow in December in Lancaster?

In December, it is snowing for 9.4 days. Throughout December, 3.54" (90mm) of snow is accumulated.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 6min of daylight.

What is the average length of the day in December?

In December, the average day length is 9h and 5min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 7:14 am and sunset at 4:29 pm. On the last day of the month, sunrise is at 7:33 am and sunset at 4:38 pm CST.

How many hours of sunshine does Lancaster have in December?

The average sunshine duration in December is 4h.

When is the lowest UV index?

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

What is the UV index intensity in December?

In December, the average daily maximum UV index is 1. A UV Index estimate of 2, and below, represents a minimal hazard to health from exposure to Sun's UV rays.
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
Lancaster, WI

Average temperature in December - Lancaster, WI
  • Average high temperature in December: 30.2°F

The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (23.4°F).

  • Average low temperature in December: 19.9°F

The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is January (11.3°F).

Average pressure in December
Lancaster, WI

Average pressure in December - Lancaster, 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
Lancaster, WI

Average wind speed in December - Lancaster, WI
  • Average wind speed in December: 9.3mph

The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).

Average humidity in December
Lancaster, WI

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

The months with the highest relative humidity are January and February (88%).
The month with the lowest relative humidity is October (76%).

Average rainfall in December
Lancaster, WI

Average rainfall in December - Lancaster, WI
  • Average rainfall in December: 1.42"

The wettest month (with the highest rainfall) is June (3.62").
The driest month (with the least rainfall) is January (1.06").

Average rainfall days in December
Lancaster, WI

Average rainfall days in December - Lancaster, WI
  • Average rainfall days in December: 5.5 days

The month with the highest number of rainy days is May (18.5 days).
The months with the least rainy days are January and February (3.8 days).

Average snowfall in December
Lancaster, WI

Average snowfall in December - Lancaster, WI
  • Average snowfall in December: 3.54"

The month with the highest snowfall is January (4.8").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Lancaster, WI

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

The month with the highest number of snowfall days is January (12.3 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
Lancaster, WI

Average daylight in December / Average sunshine in December - Lancaster, 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: 4h and 0min

The months with the most sunshine are July and August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

Average sunshine days in December
Lancaster, WI

Average sunshine days in December - Lancaster, WI
  • Average sunshine days in December: 17.8 days

The month with the most sunshine days is November (18.2 days).
The month with the least sunshine days is June (10 days).

Average UV index in December
Lancaster, WI

Average UV index in December - Lancaster, 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
Lancaster, WI

Average cloud cover in December - Lancaster, WI
  • Average cloud cover in December: 60

The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 31).

Average visibility in December
Lancaster, WI

Average visibility in December - Lancaster, 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).

Lancaster, Wisconsin, USA

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