December weather forecast
Waltman, WY

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Weather in December

December, the first month of the winter in Waltman, is also a subzero cold month, with an average temperature fluctuating between 28.6°F (-1.9°C) and 15.1°F (-9.4°C).

Temperature

The month of December, characterized by an average high of 28.6°F (-1.9°C) and a low of 15.1°F (-9.4°C), is recognized as the coldest.

Humidity

In December, the average relative humidity is 76%.

Rainfall

In Waltman, in December, during 3.3 rainfall days, 0.63" (16mm) of precipitation is typically accumulated. Throughout the year, in Waltman, there are 81 rainfall days, and 8.98" (228mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall. In Waltman, Wyoming, in December, during 9.8 snowfall days, 4.21" (107mm) of snow is typically accumulated. Throughout the year, there are 62.6 snowfall days, and 31.65" (804mm) of snow is accumulated.

Daylight

With an average of 9h and 6min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:21 am and sunset at 4:34 pm. On the last day of December, sunrise is at 7:40 am and sunset at 4:44 pm MST.

Sunshine

The average sunshine in December is 6.5h.

UV index

The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for the average person.
Note: In December, a daily UV index of 2 turns into the following recommendations:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Updated: Jun 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest time of year?

December is the coldest month of the year, registering average temperatures as high as 28.6°F (-1.9°C) and as low as 15.1°F (-9.4°C).

How cold is it in December?

In December, the average high-temperature and low-temperature in Waltman are 28.6°F (-1.9°C) and 15.1°F (-9.4°C) respectively.

What is the average humidity in December?

The average relative humidity in December is 76%.

How many days does it rain in December?

In December, the rain falls for 3.3 days. Throughout December, 0.63" (16mm) of precipitation is accumulated.

How many days does it snow in December?

In Waltman, in December, snow falls for 9.8 days, with typically accumulated 4.21" (107mm) of snow.

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 4min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:21 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:40 am and sunset at 4:44 pm MST.

How long on average sun shines in December?

The average sunshine duration in December is 6.5h.

When is the lowest UV index?

January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index reading in December?

In Waltman, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health threat from unsafe 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
Waltman, WY

Average temperature in December - Waltman, WY
  • Average high temperature in December: 28.6°F

The warmest month (with the highest average high temperature) is July (85.1°F).
The month with the lowest average high temperature is December (28.6°F).

  • Average low temperature in December: 15.1°F

The month with the highest average low temperature is July (61.2°F).
The coldest month (with the lowest average low temperature) is December (15.1°F).

Average pressure in December
Waltman, WY

Average pressure in December - Waltman, WY
  • Average pressure in December: 30.16"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).

Average wind speed in December
Waltman, WY

Average wind speed in December - Waltman, WY
  • Average wind speed in December: 11.6mph

The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest month (with the lowest average wind speed) is August (8.4mph).

Average humidity in December
Waltman, WY

Average humidity in December - Waltman, WY
  • Average humidity in December: 76%

The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (36%).

Average rainfall in December
Waltman, WY

Average rainfall in December - Waltman, WY
  • Average rainfall in December: 0.63"

The wettest month (with the highest rainfall) is May (1.34").
The driest month (with the least rainfall) is August (0.35").

Average rainfall days in December
Waltman, WY

Average rainfall days in December - Waltman, WY
  • Average rainfall days in December: 3.3 days

The month with the highest number of rainy days is May (10.9 days).
The month with the least rainy days is December (3.3 days).

Average snowfall in December
Waltman, WY

Average snowfall in December - Waltman, WY
  • Average snowfall in December: 4.21"

The month with the highest snowfall is March (5.55").
The months with the least snowfall are June, July and August (0").

Average snowfall days in December
Waltman, WY

Average snowfall days in December - Waltman, WY
  • Average snowfall days in December: 9.8 days

The month with the highest number of snowfall days is February (11.3 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight in December /
Average sunshine in December
Waltman, WY

Average daylight in December / Average sunshine in December - Waltman, WY
  • 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: 6h and 3min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is February (Average sunshine: 6h and 12min).

Average sunshine days in December
Waltman, WY

Average sunshine days in December - Waltman, WY
  • Average sunshine days in December: 19.9 days

The month with the most sunshine days is August (20.3 days).
The month with the least sunshine days is April (13.6 days).

Average UV index in December
Waltman, WY

Average UV index in December - Waltman, WY
  • Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).

Average cloud cover in December
Waltman, WY

Average cloud cover in December - Waltman, WY
  • Average cloud cover in December: 31

The month with the most cloud cover is February (Cloud cover 34).
The month with the least cloud cover is August (Cloud cover 13).

Average visibility in December
Waltman, WY

Average visibility in December - Waltman, WY
  • Average visibility in December: 6mi

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

Waltman, Wyoming, USA

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