December weather forecast
Watertown, WI

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Weather in December

Closing the year, December in Watertown, Wisconsin welcomes the winter season in full swing. The chill of winter takes over the autumn's tail end and snow driven landscapes become a common sight. The lowering temperatures, averaging out between 19.9°F (-6.7°C) and 30.2°F (-1°C), indicate the arrival of the peak of winter. Despite the cold weather, the festive spirit of the holiday season adds warmth to the winter chill of December. The elongating nights and shortened daylight hours create the ideal atmosphere for huddling near the fireplace with hot cocoa.

Temperature

The arrival of December in Watertown corresponds with a shift in temperature, down from an icy 42.6°F (5.9°C) in November to a freezing cold 30.2°F (-1°C). Nighttime temperatures in December average to 19.9°F (-6.7°C).

Humidity

The average relative humidity in December is 85%.

Rainfall

The months with the least rainfall are February and December Rain falls for 5.7 days and accumulates 0.47" (12mm) of rain.

Snowfall

January through May, October through December are months with snowfall in Watertown. In December, in Watertown, it is snowing for 9.8 days. Throughout December, 0.79" (20mm) of snow is accumulated. In Watertown, during the entire year, snow falls for 45 days and aggregates up to 5.51" (140mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 0min of daylight.
On the first day of December, sunrise is at 7:07 am and sunset at 4:20 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:29 pm CST.

Sunshine

In December, the average sunshine is 3.8h.

UV index

January, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: The UV index of 1 during December leads to these advisories:
Sun exposure does not present considerable issues for many, yet infants, fair-skinned people, and children necessitate constant protection. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
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Frequently asked questions

How cold is it in Watertown in December?

The high-temperature, in December, in Watertown, is 30.2°F (-1°C), while the low-temperature averages to 19.9°F (-6.7°C).

What is the average humidity in December in Watertown?

The average relative humidity in December in Watertown is 85%.

What is the driest month in Watertown?

The months with the least rainfall are February and December Rain falls for 5.7 days and accumulates 0.47" (12mm) of rain.

How many days does it rain in December in Watertown?

In Watertown, during December, the rain falls for 5.7 days and regularly aggregates up to 0.47" (12mm) of precipitation.

How many days does it snow in December in Watertown?

In Watertown, Wisconsin, during December, snow falls for 9.8 days and regularly aggregates up to 0.79" (20mm) of snow.

What is the month with the shortest days in Watertown?

December has the shortest days of the year in Watertown, Wisconsin, with an average of 9h and 0min of daylight.

What is the average length of the day in December in Watertown?

The average day length in December in Watertown, Wisconsin, is 9h and 3min.

When are sunrise and sunset in December in Watertown?

On the first day of December in Watertown, sunrise is at 7:07 am and sunset at 4:20 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:29 pm CST.

How long on average sun shines in December in Watertown?

In Watertown, the average sunshine duration in December is 3.8h.

When is the lowest UV index in Watertown?

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 Watertown?

In December, the average daily maximum UV index in Watertown is 1. A UV Index of 2, and less, symbolizes a minimal hazard to health from unprotected exposure to 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
Watertown, WI

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

The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is January (23.7°F).

  • Average low temperature in December: 19.9°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 (11.7°F).

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Average pressure in December
Watertown, WI

Average pressure in December - Watertown, WI
  • Average pressure in December: 30.09"Hg

The months with the highest atmospheric pressure are January and February (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in December
Watertown, WI

Average wind speed in December - Watertown, WI
  • Average wind speed in December: 9.2mph

The windiest month (with the highest average wind speed) is April (10mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).

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Average humidity in December
Watertown, WI

Average humidity in December - Watertown, WI
  • Average humidity in December: 85%

The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is April (76%).

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Average rainfall in December
Watertown, WI

Average rainfall in December - Watertown, WI
  • Average rainfall in December: 0.47"

The wettest month (with the highest rainfall) is July (1.54").
The driest months (with the least rainfall) are February and December (0.47").

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Average rainfall days in December
Watertown, WI

Average rainfall days in December - Watertown, WI
  • Average rainfall days in December: 5.7 days

The month with the highest number of rainy days is May (14.4 days).
The month with the least rainy days is February (3 days).

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Average snowfall in December
Watertown, WI

Average snowfall in December - Watertown, WI
  • Average snowfall in December: 0.79"

The month with the highest snowfall is January (1.61").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Watertown, WI

Average snowfall days in December - Watertown, WI
  • Average snowfall days in December: 9.8 days

The month with the highest number of snowfall days is January (12.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Watertown, WI

Average daylight in December / Average sunshine in December - Watertown, WI
  • Average daylight in December: 9h and 0min

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 0min).

  • Average sunshine in December: 3h and 5min

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 24min).

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Average sunshine days in December
Watertown, WI

Average sunshine days in December - Watertown, WI
  • Average sunshine days in December: 18.4 days

The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is July (12.4 days).

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Average UV index in December
Watertown, WI

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

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).

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Average cloud cover in December
Watertown, WI

Average cloud cover in December - Watertown, WI
  • Average cloud cover in December: 62

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

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Average visibility in December
Watertown, WI

Average visibility in December - Watertown, 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).

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Watertown, Wisconsin, USA

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