January weather forecast
Decker, MT

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Weather in January

January, like December, is another subzero cold winter month in Decker, Montana, with an average temperature fluctuating between 16.2°F (-8.8°C) and 31.8°F (-0.1°C).

Temperature

Decker records an average high-temperature of a still freezing cold 31.8°F (-0.1°C) as January arrives, nearly mirroring the previous month's climate. In January, the recorded average low-temperature is a still freezing cold 16.2°F (-8.8°C).

Humidity

January and February, with an average relative humidity of 79%, are the most humid months in Decker.

Rainfall

In Decker, in January, during 6.3 rainfall days, 0.75" (19mm) of precipitation is typically accumulated. In Decker, during the entire year, the rain falls for 127.6 days and collects up to 14.25" (362mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall in Decker. In Decker, Montana, in January, during 12 snowfall days, 4.45" (113mm) of snow is typically accumulated. Throughout the year, there are 65.3 snowfall days, and 28.82" (732mm) of snow is accumulated.

Daylight

In January, the average length of the day is 9h and 14min.
On the first day of the month, sunrise is at 7:45 am and sunset at 4:36 pm. On the last day of January, sunrise is at 7:28 am and sunset at 5:13 pm MST.

Sunshine

The average sunshine in January in Decker is 6.1h.

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 low health risk from unsafe exposure to UV radiation for the average person.
Note: The maximum UV index of 2 during January leads to these instructions:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
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Frequently asked questions

How cold is it in Decker in January?

An average high-temperature, in January, in Decker, is 31.8°F (-0.1°C) and the average low-temperature is 16.2°F (-8.8°C).

What is the most humid month in Decker?

The months with the highest humidity in Decker, Montana, are January and February, with an average relative humidity of 79%.

What is the average humidity in January in Decker?

The average relative humidity in January in Decker is 79%.

How much does it rain in Decker in January?

In January, in Decker, Montana, the rain falls for 6.3 days. Throughout January, 0.75" (19mm) of precipitation is accumulated.

How much does it snow in Decker in January?

In January, in Decker, Montana, it is snowing for 12 days. Throughout January, 4.45" (113mm) of snow is accumulated.

How many hours of daylight does Decker have in January?

The average day length in January is 9h and 14min.

When is the sunrise / sunset in January in Decker?

On the first day of January in Decker, Montana, sunrise is at 7:45 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 5:13 pm MST.

How many hours of sunshine does Decker have in January?

The average sunshine duration in January in Decker, Montana, is 6.1h.

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

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

How high is the UV index in January in Decker?

In Decker, Montana, the average daily maximum UV index in January is 2. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to 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 January
Decker, MT

Average temperature in January - Decker, MT
  • Average high temperature in January: 31.8°F

The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is December (31.1°F).

  • Average low temperature in January: 16.2°F

The month with the highest average low temperature is July (61.5°F).
The coldest months (with the lowest average low temperature) are January and February (16.2°F).

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Average pressure in January
Decker, MT

Average pressure in January - Decker, MT
  • Average pressure in January: 30.13"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 January
Decker, MT

Average wind speed in January - Decker, MT
  • Average wind speed in January: 7.4mph

The windiest month (with the highest average wind speed) is April (9.1mph).
The calmest months (with the lowest average wind speed) are July and December (6.8mph).

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Average humidity in January
Decker, MT

Average humidity in January - Decker, MT
  • Average humidity in January: 79%

The months with the highest relative humidity are January and February (79%).
The month with the lowest relative humidity is August (40%).

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Average rainfall in January
Decker, MT

Average rainfall in January - Decker, MT
  • Average rainfall in January: 0.75"

The wettest month (with the highest rainfall) is May (2.64").
The driest month (with the least rainfall) is December (0.67").

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Average rainfall days in January
Decker, MT

Average rainfall days in January - Decker, MT
  • Average rainfall days in January: 6.3 days

The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is January (6.3 days).

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Average snowfall in January
Decker, MT

Average snowfall in January - Decker, MT
  • Average snowfall in January: 4.45"

The month with the highest snowfall is February (5.2").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in January
Decker, MT

Average snowfall days in January - Decker, MT
  • Average snowfall days in January: 12 days

The month with the highest number of snowfall days is February (14.3 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in January /
Average sunshine in January
Decker, MT

Average daylight in January / Average sunshine in January - Decker, MT
  • Average daylight in January: 9h and 1min

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 January: 6h and 1min

The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 42min).

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Average sunshine days in January
Decker, MT

Average sunshine days in January - Decker, MT
  • Average sunshine days in January: 15.3 days

The month with the most sunshine days is September (18.2 days).
The month with the least sunshine days is May (9.6 days).

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Average UV index in January
Decker, MT

Average UV index in January - Decker, MT
  • Average UV index in January: 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 January
Decker, MT

Average cloud cover in January - Decker, MT
  • Average cloud cover in January: 36

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 14).

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Average visibility in January
Decker, MT

Average visibility in January - Decker, MT
  • Average visibility in January: 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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Decker, Montana, USA

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