December weather forecast
Forsyth, MT

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Weather in December

December, the first month of the winter in Forsyth, is also a subzero cold month, with temperature in the range of an average high of 30.2°F (-1°C) and an average low of 17.6°F (-8°C).

Temperature

The shift from November to December involves a decrease in the average high-temperature, dropping from a frosty 43°F (6.1°C) to a freezing cold 30.2°F (-1°C). Nighttime temperatures in December average to 17.6°F (-8°C).

Humidity

The average relative humidity in December is 76%.

Rainfall

In December, in Forsyth, the rain falls for 6.5 days. Throughout December, 0.67" (17mm) of precipitation is accumulated. Throughout the year, there are 121.7 rainfall days, and 13.23" (336mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In December, in Forsyth, it is snowing for 11.6 days. Throughout December, 3.94" (100mm) of snow is accumulated. Throughout the year, there are 56.6 snowfall days, and 21.06" (535mm) of snow is accumulated.

Daylight

With an average of 8h and 42min of daylight, December has the shortest days of the year in Forsyth, Montana.
On the first day of December in Forsyth, sunrise is at 7:29 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 7:49 am and sunset at 4:30 pm MST.

Sunshine

In December, the average sunshine is 5.4h.

UV index

The month with the lowest UV index in Forsyth is December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for average individuals.
Note: The maximum daily UV index of 1 in December interprets into the following recommendations:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
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Frequently asked questions

How cold is December in Forsyth?

The high-temperature, in December, in Forsyth, is 30.2°F (-1°C), while the low-temperature averages to 17.6°F (-8°C). In July, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which represents the influence of relative humidity on air temperature, is calculated to be 86°F (30°C).

What is the average humidity in December in Forsyth?

In December, the average relative humidity in Forsyth is 76%.

How many days does it rain in December in Forsyth?

In Forsyth, Montana, during December, the rain falls for 6.5 days and regularly aggregates up to 0.67" (17mm) of precipitation.

How many days does it snow in December in Forsyth?

In Forsyth, during December, snow falls for 11.6 days and regularly aggregates up to 3.94" (100mm) of snow.

What is the month with the shortest days in Forsyth?

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

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

In December, the average day length is 8h and 41min.

When are sunrise and sunset in December in Forsyth?

On the first day of December, sunrise is at 7:29 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 7:49 am and sunset at 4:30 pm MST.

How long on average sun shines in December in Forsyth?

In Forsyth, Montana, the average sunshine duration in December is 5.4h.

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

The month with the lowest UV index is December, with an average maximum UV index of 1.

How high is the UV index in December in Forsyth?

The average daily maximum UV index in December is 1. A UV Index value of 2, and less, symbolizes 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
Forsyth, MT

Average temperature in December - Forsyth, MT
  • Average high temperature in December: 30.2°F

The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in December: 17.6°F

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (16.3°F).

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Average pressure in December
Forsyth, MT

Average pressure in December - Forsyth, MT
  • Average pressure in December: 30.12"Hg

The months with the highest atmospheric pressure are January and February (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

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Average wind speed in December
Forsyth, MT

Average wind speed in December - Forsyth, MT
  • Average wind speed in December: 9.8mph

The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest month (with the lowest average wind speed) is August (8.9mph).

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Average humidity in December
Forsyth, MT

Average humidity in December - Forsyth, MT
  • Average humidity in December: 76%

The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is August (38%).

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Average rainfall in December
Forsyth, MT

Average rainfall in December - Forsyth, MT
  • Average rainfall in December: 0.67"

The wettest month (with the highest rainfall) is May (2.05").
The driest month (with the least rainfall) is November (0.63").

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Average rainfall days in December
Forsyth, MT

Average rainfall days in December - Forsyth, MT
  • Average rainfall days in December: 6.5 days

The month with the highest number of rainy days is May (15.1 days).
The months with the least rainy days are January, February and December (6.5 days).

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Average snowfall in December
Forsyth, MT

Average snowfall in December - Forsyth, MT
  • Average snowfall in December: 3.94"

The month with the highest snowfall is February (4.53").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Forsyth, MT

Average snowfall days in December - Forsyth, MT
  • Average snowfall days in December: 11.6 days

The month with the highest number of snowfall days is January (12.5 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
Forsyth, MT

Average daylight in December / Average sunshine in December - Forsyth, 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: 5h and 2min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).

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Average sunshine days in December
Forsyth, MT

Average sunshine days in December - Forsyth, MT
  • Average sunshine days in December: 15.7 days

The month with the most sunshine days is September (17.9 days).
The month with the least sunshine days is April (11.9 days).

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Average UV index in December
Forsyth, MT

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

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

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Average cloud cover in December
Forsyth, MT

Average cloud cover in December - Forsyth, MT
  • Average cloud cover in December: 44

The month with the most cloud cover is February (Cloud cover 46).
The months with the least cloud cover are July and August (Cloud cover 15).

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Average visibility in December
Forsyth, MT

Average visibility in December - Forsyth, 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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Forsyth, Montana, USA

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