December weather forecast
Terry, MT

Weather in December

December, the first month of the winter in Terry, is still a freezing cold month, with an average temperature fluctuating between 14.2°F (-9.9°C) and 26.2°F (-3.2°C).

Temperature

In Terry, the average high-temperature in December drops from a cold 40.5°F (4.7°C) in November to a freezing cold 26.2°F (-3.2°C). In Terry, Montana, the average low-temperature is 14.2°F (-9.9°C).

Humidity

The average relative humidity in December in Terry is 82%.

Rainfall

In December, the rain falls for 4.1 days. Throughout December, 0.59" (15mm) of precipitation is accumulated. Throughout the year, there are 102.6 rainfall days, and 13.35" (339mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Terry are January through May, October through December. In Terry, during December, snow falls for 11.5 days and regularly aggregates up to 2.95" (75mm) of snow. In Terry, Montana, during the entire year, snow falls for 58.7 days and aggregates up to 17.28" (439mm) of snow.

Daylight

With an average of 8h and 37min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:25 am and sunset at 4:15 pm. On the last day of December, sunrise is at 7:46 am and sunset at 4:22 pm MST.

Sunshine

February and December, with an average of 4.9h of sunshine, are months with the least sunshine in Terry.

UV index

November and December, with an average maximum UV index of 1, are months with the lowest UV index in Terry. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the average person.
Note: In December, the average maximum UV index of 1 translate into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in December in Terry?

The average relative humidity in December in Terry, Montana, is 82%.

How much does it rain in Terry in December?

In Terry, Montana, in December, during 4.1 rainfall days, 0.59" (15mm) of precipitation is typically accumulated.

How many days does it snow in December in Terry?

In Terry, during December, snow falls for 11.5 days and regularly aggregates up to 2.95" (75mm) of snow.

What is the month with the shortest days in Terry?

The month with the shortest days in Terry is December, with an average of 8h and 37min of daylight.

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

In Terry, Montana, the average day length in December is 8h and 37min.

When are sunrise and sunset in December in Terry?

In December, on the first day of the month, sunrise is at 7:25 am and sunset at 4:15 pm. On the last day of the month, in Terry, Montana, sunrise is at 7:46 am and sunset at 4:22 pm MST.

What is the month with the least sunshine in Terry?

February and December, with an average of 4.9h of sunshine, are months with the least sunshine in Terry.

How many hours of sunshine does Terry have in December?

In Terry, the average sunshine duration in December is 4.9h.

When is the lowest UV index in Terry?

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

How high is the UV index in December in Terry?

In Terry, the average daily maximum UV index in December is 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to Sun's UV rays.

Average temperature in December
Terry, MT

Average temperature in December - Terry, MT
  • Average high temperature in December: 26.2°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (25.5°F).

  • Average low temperature in December: 14.2°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).

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Average pressure in December
Terry, MT

Average pressure in December - Terry, MT
  • Average pressure in December: 30.14"Hg

The month with the highest atmospheric pressure is February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).

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Average wind speed in December
Terry, MT

Average wind speed in December - Terry, MT
  • Average wind speed in December: 10.2mph

The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is August (9.3mph).

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Average humidity in December
Terry, MT

Average humidity in December - Terry, MT
  • Average humidity in December: 82%

The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (43%).

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Average rainfall in December
Terry, MT

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

The wettest month (with the highest rainfall) is May (2.2").
The driest month (with the least rainfall) is January (0.51").

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Average rainfall days in December
Terry, MT

Average rainfall days in December - Terry, MT
  • Average rainfall days in December: 4.1 days

The month with the highest number of rainy days is May (13.7 days).
The month with the least rainy days is February (4 days).

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Average snowfall in December
Terry, MT

Average snowfall in December - Terry, MT
  • Average snowfall in December: 2.95"

The month with the highest snowfall is February (3.62").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Terry, MT

Average snowfall days in December - Terry, MT
  • Average snowfall days in December: 11.5 days

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

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

Average daylight in December / Average sunshine in December - Terry, MT
  • Average daylight in December: 8h and 37min

The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 37min).

  • Average sunshine in December: 4.9h

The month with the most sunshine is July (Average sunshine: 11.7h).
The months with the least sunshine are February and December (Average sunshine: 4.9).

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Average sunshine days in December
Terry, MT

Average sunshine days in December - Terry, MT
  • Average sunshine days in December: 17.5 days

The month with the most sunshine days is September (19.8 days).
The month with the least sunshine days is June (13.1 days).

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Average UV index in December
Terry, MT

Average UV index in December - Terry, MT
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are November and December (UV index 1).

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Average cloud cover in December
Terry, MT

Average cloud cover in December - Terry, MT
  • Average cloud cover in December: 48

The month with the most cloud cover is February (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 17).

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Average visibility in December
Terry, MT

Average visibility in December - Terry, 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).

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