December weather forecast
Greycliff, MT

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Weather in December

December, the first month of the winter in Greycliff, is still a freezing cold month, with an average temperature varying between 16°F (-8.9°C) and 28.4°F (-2°C).

Temperature

December proves to be the coldest month, recording an average maximum temperature of 28.4°F (-2°C) and a minimum temperature of 16°F (-8.9°C).

Humidity

The average relative humidity in December is 78%.

Rainfall

In Greycliff, in December, during 5.3 rainfall days, 0.59" (15mm) of precipitation is typically accumulated. Throughout the year, there are 129.6 rainfall days, and 15.83" (402mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall. In December, in Greycliff, it is snowing for 10.5 days. Throughout December, 4.61" (117mm) of snow is accumulated. Throughout the year, there are 67.6 snowfall days, and 38.19" (970mm) of snow is accumulated.

Daylight

With an average of 8h and 42min of daylight, December has the shortest days of the year in Greycliff, Montana.
On the first day of the month, sunrise is at 7:40 am and sunset at 4:36 pm. On the last day of December, in Greycliff, sunrise is at 8:00 am and sunset at 4:44 pm MST.

Sunshine

January, February and December, with an average of 6.2h of sunshine, are months with the least sunshine.

UV index

January through April, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Greycliff, Montana. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.
Note: In December, the maximum UV index of 2 transforms into these recommendations:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Always opt for UVA and UVB-resistant sunglasses on radiant days. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Updated: Feb 13, 2024 | Published by: Weather U.S. | About Us / Weather Forecasting / Data Sources

Frequently asked questions

What part of the year is the coldest in Greycliff?

December, with its average high-temperature of 28.4°F (-2°C) and an average low-temperature of 16°F (-8.9°C), holds the record as the coldest month in Greycliff.

How cold is December in Greycliff?

In December, the average high-temperature and low-temperature are 28.4°F (-2°C) and 16°F (-8.9°C) respectively.

What is the average humidity in December in Greycliff?

The average relative humidity in December in Greycliff, Montana, is 78%.

How many days does it rain in December in Greycliff?

In December, in Greycliff, Montana, the rain falls for 5.3 days. Throughout December, 0.59" (15mm) of precipitation is accumulated.

How much does it snow in Greycliff in December?

In Greycliff, during December, snow falls for 10.5 days and regularly aggregates up to 4.61" (117mm) of snow.

What is the month with the shortest days in Greycliff?

December has the shortest days of the year in Greycliff, with an average of 8h and 42min of daylight.

How many hours of daylight does Greycliff have in December?

The average day length in December in Greycliff is 8h and 45min.

When are sunrise and sunset in December in Greycliff?

In December, on the first day of the month, sunrise is at 7:40 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 8:00 am and sunset at 4:44 pm MST.

What is the month with the least sunshine in Greycliff?

January, February and December, with an average of 6.2h of sunshine, are months with the least sunshine in Greycliff, Montana.

How long on average sun shines in December in Greycliff?

In December, the average sunshine duration is 6.2h.

What is the month with the lowest UV index in Greycliff?

The months with the lowest UV index in Greycliff, Montana, are January through April, October through December, with an average maximum UV index of 2.

What is the UV index reading in December in Greycliff?

In Greycliff, Montana, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health threat 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
Greycliff, MT

Average temperature in December - Greycliff, MT
  • Average high temperature in December: 28.4°F

The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is December (28.4°F).

  • Average low temperature in December: 16°F

The month with the highest average low temperature is August (52.9°F).
The coldest month (with the lowest average low temperature) is February (15.3°F).

Average pressure in December
Greycliff, MT

Average pressure in December - Greycliff, MT
  • Average pressure in December: 30.16"Hg

The months with the highest atmospheric pressure are January and December (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

Average wind speed in December
Greycliff, MT

Average wind speed in December - Greycliff, MT
  • Average wind speed in December: 10.5mph

The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).

Average humidity in December
Greycliff, MT

Average humidity in December - Greycliff, MT
  • Average humidity in December: 78%

The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is August (47%).

Average rainfall in December
Greycliff, MT

Average rainfall in December - Greycliff, MT
  • Average rainfall in December: 0.59"

The wettest month (with the highest rainfall) is May (3.15").
The driest month (with the least rainfall) is January (0.47").

Average rainfall days in December
Greycliff, MT

Average rainfall days in December - Greycliff, MT
  • Average rainfall days in December: 5.3 days

The month with the highest number of rainy days is May (19.8 days).
The months with the least rainy days are January and December (5.3 days).

Average snowfall in December
Greycliff, MT

Average snowfall in December - Greycliff, MT
  • Average snowfall in December: 4.61"

The month with the highest snowfall is March (7.09").
The months with the least snowfall are June, July and August (0").

Average snowfall days in December
Greycliff, MT

Average snowfall days in December - Greycliff, MT
  • Average snowfall days in December: 10.5 days

The month with the highest number of snowfall days is February (12.9 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight in December /
Average sunshine in December
Greycliff, MT

Average daylight in December / Average sunshine in December - Greycliff, MT
  • Average daylight in December: 8h and 4min

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

  • Average sunshine in December: 6h and 1min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 12min).

Average sunshine days in December
Greycliff, MT

Average sunshine days in December - Greycliff, MT
  • Average sunshine days in December: 19.3 days

The month with the most sunshine days is January (19.8 days).
The month with the least sunshine days is May (7.7 days).

Average UV index in December
Greycliff, MT

Average UV index in December - Greycliff, MT
  • Average UV index in December: 2

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

Average cloud cover in December
Greycliff, MT

Average cloud cover in December - Greycliff, MT
  • Average cloud cover in December: 37

The month with the most cloud cover is February (Cloud cover 41).
The months with the least cloud cover are July and August (Cloud cover 16).

Average visibility in December
Greycliff, MT

Average visibility in December - Greycliff, MT
  • 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).

Greycliff, Montana, USA

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