December weather forecast
Boyd, MT

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Weather in December

The first month of the winter, December, is also a subzero cold month in Boyd, Montana, with an average temperature fluctuating between 30.7°F (-0.7°C) and 17.4°F (-8.1°C).

Temperature

Boyd's coldest month, December, registers temperatures that range from a high of 30.7°F (-0.7°C) to a low of 17.4°F (-8.1°C).

Humidity

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

Rainfall

In December, the rain falls for 6.2 days. Throughout December, 0.63" (16mm) of precipitation is accumulated. In Boyd, during the entire year, the rain falls for 108.1 days and collects up to 12.83" (326mm) of precipitation.

Snowfall

Months with snowfall in Boyd are January through June, September through December. In Boyd, in December, snow falls for 9.6 days, with typically accumulated 4.72" (120mm) of snow. In Boyd, during the entire year, snow falls for 61.5 days and aggregates up to 41.77" (1061mm) of snow.

Daylight

The month with the shortest days in Boyd is December, with an average of 8h and 48min of daylight.
On the first day of the month, sunrise is at 7:36 am and sunset at 4:34 pm. On the last day of December, sunrise is at 7:56 am and sunset at 4:43 pm MST.

Sunshine

In Boyd, the average sunshine in December is 6.4h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Boyd, Montana. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index of 2 in December interprets into the following recommendations:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What time of the year is the coldest in Boyd?

December, with its average high-temperature of 30.7°F (-0.7°C) and an average low-temperature of 17.4°F (-8.1°C), holds the record as the coldest month in Boyd, Montana.

How cold is December in Boyd?

December temperatures vary between a high-temperature of 30.7°F (-0.7°C) and a low-temperature of 17.4°F (-8.1°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, in August is calculated to be 80.6°F (27°C).

What is the average humidity in December in Boyd?

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

How many days does it rain in December in Boyd?

In Boyd, Montana, during December, the rain falls for 6.2 days and regularly aggregates up to 0.63" (16mm) of precipitation.

How many days does it snow in December in Boyd?

In Boyd, Montana, in December, snow falls for 9.6 days, with typically accumulated 4.72" (120mm) of snow.

What is the month with the shortest days in Boyd?

December has the shortest days of the year in Boyd, Montana, with an average of 8h and 48min of daylight.

How many hours of daylight does Boyd have in December?

In December, the average day length in Boyd is 8h and 47min.

When is the sunrise / sunset in December in Boyd?

On the first day of December, sunrise is at 7:36 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:56 am and sunset at 4:43 pm MST.

How long on average sun shines in December in Boyd?

The average sunshine duration in December is 6.4h.

What are the months with the lowest UV index in Boyd?

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

How high is the UV index in December in Boyd?

In Boyd, Montana, the average daily maximum UV index in December is 2. A UV Index value 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
Boyd, MT

Average temperature in December - Boyd, MT
  • Average high temperature in December: 30.7°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is December (30.7°F).

  • Average low temperature in December: 17.4°F

The months with the highest average low temperature are July and August (57.2°F).
The coldest month (with the lowest average low temperature) is February (16.7°F).

Average pressure in December
Boyd, MT

Average pressure in December - Boyd, MT
  • Average pressure in December: 30.15"Hg

The months with the highest atmospheric pressure are January and December (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

Average wind speed in December
Boyd, MT

Average wind speed in December - Boyd, MT
  • Average wind speed in December: 8.5mph

The windiest month (with the highest average wind speed) is January (8.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).

Average humidity in December
Boyd, MT

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

The month with the highest relative humidity is January (76%).
The month with the lowest relative humidity is August (41%).

Average rainfall in December
Boyd, MT

Average rainfall in December - Boyd, MT
  • Average rainfall in December: 0.63"

The wettest month (with the highest rainfall) is May (2.09").
The driest month (with the least rainfall) is January (0.51").

Average rainfall days in December
Boyd, MT

Average rainfall days in December - Boyd, MT
  • Average rainfall days in December: 6.2 days

The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is February (4 days).

Average snowfall in December
Boyd, MT

Average snowfall in December - Boyd, MT
  • Average snowfall in December: 4.72"

The month with the highest snowfall is February (6.81").
The months with the least snowfall are July and August (0").

Average snowfall days in December
Boyd, MT

Average snowfall days in December - Boyd, MT
  • Average snowfall days in December: 9.6 days

The month with the highest number of snowfall days is February (10.8 days).
The months with the least snowfall days are July and August (0 days).

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

Average daylight in December / Average sunshine in December - Boyd, 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: 6h and 2min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 12min).

Average sunshine days in December
Boyd, MT

Average sunshine days in December - Boyd, MT
  • Average sunshine days in December: 19.7 days

The month with the most sunshine days is December (19.7 days).
The month with the least sunshine days is May (10.5 days).

Average UV index in December
Boyd, MT

Average UV index in December - Boyd, 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, November and December (UV index 2).

Average cloud cover in December
Boyd, MT

Average cloud cover in December - Boyd, MT
  • Average cloud cover in December: 33

The month with the most cloud cover is February (Cloud cover 38).
The months with the least cloud cover are July and August (Cloud cover 15).

Average visibility in December
Boyd, MT

Average visibility in December - Boyd, 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).

Boyd, Montana, USA

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