December weather forecast
Garryowen, MT

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Weather in December

December, the first month of the winter in Garryowen, is still a freezing cold month, with an average temperature varying between 18.1°F (-7.7°C) and 31.3°F (-0.4°C).

Temperature

With an average high-temperature of 31.3°F (-0.4°C) and an average low-temperature of 18.1°F (-7.7°C), December is the coldest month.

Humidity

In December, the average relative humidity in Garryowen is 74%.

Rainfall

In Garryowen, in December, during 5.9 rainfall days, 0.67" (17mm) of precipitation is typically accumulated. In Garryowen, during the entire year, the rain falls for 103 days and collects up to 11.97" (304mm) of precipitation.

Snowfall

Months with snowfall are January through May, September through December. In December, it is snowing for 10.8 days. Throughout December, 3.94" (100mm) of snow is accumulated. In Garryowen, during the entire year, snow falls for 56.7 days and aggregates up to 25.16" (639mm) of snow.

Daylight

With an average of 8h and 48min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:30 am and sunset at 4:27 pm. On the last day of December, sunrise is at 7:49 am and sunset at 4:36 pm MST.

Sunshine

The average sunshine in December is 5.8h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 2 in December interprets into the following advice:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
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Frequently asked questions

What is the coldest month in Garryowen?

The coldest period in Garryowen is December, when temperatures fluctuate between an average high of 31.3°F (-0.4°C) and a low of 18.1°F (-7.7°C).

How cold is December in Garryowen?

December temperatures vary between a high-temperature of 31.3°F (-0.4°C) and a low-temperature of 18.1°F (-7.7°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which factors the actual air temperature with the relative humidity, in July is computed to be 87.8°F (31°C).

What is the average humidity in December in Garryowen?

The average relative humidity in December in Garryowen is 74%.

How much does it rain in Garryowen in December?

In Garryowen, during December, the rain falls for 5.9 days and regularly aggregates up to 0.67" (17mm) of precipitation.

How much does it snow in Garryowen in December?

In December, it is snowing for 10.8 days. Throughout December, 3.94" (100mm) of snow is accumulated.

What is the month with the shortest days in Garryowen?

The month with the shortest days is December, with an average of 8h and 48min of daylight.

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

In December, the average day length in Garryowen is 8h and 46min.

When is the sunrise / sunset in December in Garryowen?

In December, on the first day of the month, sunrise is at 7:30 am and sunset at 4:27 pm. On the last day of the month, in Garryowen, sunrise is at 7:49 am and sunset at 4:36 pm MST.

How many hours of sunshine does Garryowen have in December?

In December, the average sunshine duration is 5.8h.

When is the lowest UV index in Garryowen?

The months with the lowest UV index in Garryowen, Montana, are January through March, November and December, with an average maximum UV index of 2.

What is the UV index intensity in December in Garryowen?

In Garryowen, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health threat from exposure to the Sun's 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
Garryowen, MT

Average temperature in December - Garryowen, MT
  • Average high temperature in December: 31.3°F

The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is December (31.3°F).

  • Average low temperature in December: 18.1°F

The month with the highest average low temperature is July (62.8°F).
The coldest month (with the lowest average low temperature) is January (17.8°F).

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Average pressure in December
Garryowen, MT

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

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).

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Average wind speed in December
Garryowen, MT

Average wind speed in December - Garryowen, MT
  • Average wind speed in December: 8.2mph

The windiest month (with the highest average wind speed) is April (9.1mph).
The calmest month (with the lowest average wind speed) is July (7.3mph).

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Average humidity in December
Garryowen, MT

Average humidity in December - Garryowen, MT
  • Average humidity in December: 74%

The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is August (38%).

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Average rainfall in December
Garryowen, MT

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

The wettest month (with the highest rainfall) is May (1.81").
The driest month (with the least rainfall) is August (0.63").

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Average rainfall days in December
Garryowen, MT

Average rainfall days in December - Garryowen, MT
  • Average rainfall days in December: 5.9 days

The month with the highest number of rainy days is May (13.6 days).
The month with the least rainy days is December (5.9 days).

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Average snowfall in December
Garryowen, MT

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

The month with the highest snowfall is February (5.43").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in December
Garryowen, MT

Average snowfall days in December - Garryowen, MT
  • Average snowfall days in December: 10.8 days

The month with the highest number of snowfall days is February (12.5 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in December / Average sunshine in December - Garryowen, MT
  • Average daylight in December: 8h and 5min

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

  • Average sunshine in December: 5h and 5min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 36min).

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Average sunshine days in December
Garryowen, MT

Average sunshine days in December - Garryowen, MT
  • Average sunshine days in December: 17.3 days

The month with the most sunshine days is September (21.5 days).
The month with the least sunshine days is February (13.3 days).

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Average UV index in December
Garryowen, MT

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

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in December
Garryowen, MT

Average cloud cover in December - Garryowen, MT
  • Average cloud cover in December: 40

The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 13).

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Average visibility in December
Garryowen, MT

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

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