December weather forecast and climate
Birney, MT

December, the first month of the winter, in Birney, is also a subzero cold month, with average temperature varying between 16.7°F (-8.5°C) and 31.1°F (-0.5°C).

Temperature

The coldest month is December, with an average high-temperature of 31.1°F (-0.5°C) and an average low-temperature of 16.7°F (-8.5°C).

Humidity

The average relative humidity in December is 75%.

Rainfall

December is the month with the least rainfall in Birney. Rain falls for 6.8 days and accumulates 0.67" (17mm) of precipitation.

Snowfall

Months with snowfall are January through May, September through December. In Birney, during December, snow falls for 11.2 days and regularly aggregates up to 3.62" (92mm) of snow. Throughout the year, in Birney, there are 65.3 snowfall days, and 28.82" (732mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 8.8h of daylight.

Sunshine

In December, the average sunshine in Birney is 6.1h.

UV index

Months with the lowest UV index in Birney are January through March, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from the exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 2 interpret into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged 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 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.

What is the coldest month in Birney?

The coldest month is December, with an average high-temperature of 31.1°F (-0.5°C) and an average low-temperature of 16.7°F (-8.5°C).

What is the temperature in December in Birney?

In December, the average high-temperature is 31.1°F (-0.5°C), and the average low-temperature is 16.7°F (-8.5°C).

What is the average humidity in December in Birney?

The average relative humidity in December in Birney is 75%.

How much does it rain in Birney in December?

In Birney, during December, the rain falls for 6.8 days and regularly aggregates up to 0.67" (17mm) of precipitation.

What is the driest month in Birney?

December is the month with the least rainfall in Birney. Rain falls for 6.8 days and accumulates 0.67" (17mm) of precipitation.

How many days does it snow in December in Birney?

In Birney, Montana, during December, snow falls for 11.2 days and regularly aggregates up to 3.62" (92mm) of snow.

What is the month with the shortest days in Birney?

December has the shortest days of the year, with an average of 8.8h of daylight.

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

In December, the average length of the day in Birney is 8.8h.

How long on average sun shines in December in Birney?

The average sunshine in December in Birney, Montana, is 6.1h.

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

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

How high is the UV index in December in Birney?

In December, the average daily maximum UV index in Birney is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from unprotected exposure to the UV radiation.
Average temperature in December - Birney, MT
  • Average high temperature in December: -0.5°C

The warmest month (with the highest average high temperature) is July (29.7°C).
The month with the lowest average high temperature is December (-0.5°C).

  • Average low temperature in December: -8.5°C

The month with the highest average low temperature is July (16.4°C).
The coldest months (with the lowest average low temperature) are January and February (-8.8°C).

Average pressure in December - Birney, MT
  • Average pressure in December: 1020.1mbar

The month with the highest atmospheric pressure is January (1020.3mbar).
The month with the lowest atmospheric pressure is June (1010.7mbar).

Average wind speed in December - Birney, MT
  • Average wind speed in December: 10.9km/h

The windiest month (with the highest average wind speed) is April (14.6km/h).
The calmest month (with the lowest average wind speed) is December (10.9km/h).

Average humidity in December - Birney, MT
  • Average humidity in December: 75%

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

Average rainfall in December - Birney, MT
  • Average rainfall in December: 17mm

The wettest month (with the highest rainfall) is May (67mm).
The driest month (with the least rainfall) is December (17mm).

Average rainfall days in December - Birney, MT
  • Average rainfall days in December: 6.8 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).

Average snowfall in December - Birney, MT
  • Average snowfall in December: 92mm

The month with the highest snowfall is February (132mm).
Months with the least snowfall are June, July and August (0mm).

Average snowfall days in December - Birney, MT
  • Average snowfall days in December: 11.2 days

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

Average daylight in December / Average sunshine in December - Birney, MT
  • Average daylight in December: 8.8h

The month with the longest days is June (Average daylight: 15.6h).
The month with the shortest days is December (Average daylight: 8.8h).

  • Average sunshine in December: 6.1h

Months with the most sunshine are July and August (Average sunshine: 11.9h).
The month with the least sunshine is February (Average sunshine: 5.7h).

Average sunshine days in December - Birney, MT
  • Average sunshine days in December: 16.5 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).

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

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

Average cloud cover in December - Birney, MT
  • Average cloud cover in December: 37

The month with the most cloud cover is February (Cloud cover 41).
Months with the least cloud cover are July and August (Cloud cover 14).

Average visibility in December - Birney, MT
  • Average visibility in December: 9km

Months with the highest visibility are May, June, July, August, September and October (10km).
Months with the lowest visibility are January, February, March, April, November and December (9km).