December weather forecast
Sidney, MT

Weather in December

December, the first month of the winter, in Sidney, is also a subzero cold month, with average temperature fluctuating between 24.6°F (-4.1°C) and 12.7°F (-10.7°C).

Temperature

In December, the average high-temperature declines considerably, from a cold 39.4°F (4.1°C) in November, to a subzero cold 24.6°F (-4.1°C). In December, in Sidney, the average low-temperature is 12.7°F (-10.7°C).

Humidity

In Sidney, the average relative humidity is 84%.

Rainfall

In Sidney, during December, the rain falls for 3.5 days and regularly aggregates up to 0.31" (8mm) of precipitation. In Sidney, Montana, during the entire year, the rain falls for 85.7 days and collects up to 8.5" (216mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Sidney. In Sidney, Montana, in December, during 11.2 snowfall days, 1.65" (42mm) of snow is typically accumulated. In Sidney, during the entire year, snow falls for 56.1 days, and aggregates up to 8.94" (227mm) of snow.

Daylight

The month with the shortest days in Sidney is December, with an average of 8.5h of daylight.

Sunshine

In December, the average sunshine is 4.5h.

UV index

In Sidney, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 2 transform into the following instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in December in Sidney?

The average relative humidity in December in Sidney, Montana, is 84%.

How much does it rain in Sidney in December?

In Sidney, Montana, in December, during 3.5 rainfall days, 0.31" (8mm) of precipitation is typically accumulated.

How much does it snow in Sidney in December?

In Sidney, during December, snow falls for 11.2 days and regularly aggregates up to 1.65" (42mm) of snow.

What is the month with the shortest days in Sidney?

With an average of 8.5h of daylight, December has the shortest days of the year.

How many hours of daylight does Sidney have in December?

The average length of the day in December in Sidney is 8.5h.

How long on average sun shines in December in Sidney?

In Sidney, the average sunshine in December is 4.5h.

What is the UV index intensity in December in Sidney?

The average daily maximum UV index in December in Sidney is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from the exposure to the Sun's UV rays.

Average temperature in December
Sidney, MT

Average temperature in December - Sidney, MT
  • Average high temperature in December: -4.1°C

The warmest month (with the highest average high temperature) is July (29°C).
The month with the lowest average high temperature is January (-4.8°C).

  • Average low temperature in December: -10.7°C

The month with the highest average low temperature is July (17.2°C).
The coldest month (with the lowest average low temperature) is January (-12.3°C).

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Average pressure in December
Sidney, MT

Average pressure in December - Sidney, MT
  • Average pressure in December: 1020.5mbar

The month with the highest atmospheric pressure is February (1021.5mbar).
The month with the lowest atmospheric pressure is June (1010.3mbar).

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Average wind speed in December
Sidney, MT

Average wind speed in December - Sidney, MT
  • Average wind speed in December: 16.1km/h

The windiest month (with the highest average wind speed) is April (17.9km/h).
The calmest month (with the lowest average wind speed) is February (14.8km/h).

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Average humidity in December
Sidney, MT

Average humidity in December - Sidney, MT
  • Average humidity in December: 84%

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (45%).

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Average rainfall in December
Sidney, MT

Average rainfall in December - Sidney, MT
  • Average rainfall in December: 8mm

The wettest month (with the highest rainfall) is July (34mm).
The driest month (with the least rainfall) is January (6mm).

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Average rainfall days in December
Sidney, MT

Average rainfall days in December - Sidney, MT
  • Average rainfall days in December: 3.5 days

The month with the highest number of rainy days is June (11.4 days).
The months with the least rainy days are January and February (3.2 days).

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Average snowfall in December
Sidney, MT

Average snowfall in December - Sidney, MT
  • Average snowfall in December: 42mm

The month with the highest snowfall is February (45mm).
The months with the least snowfall are June, July, August and September (0mm).

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Average snowfall days in December
Sidney, MT

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

The month with the highest number of snowfall days is February (12 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
Sidney, MT

Average daylight in December / Average sunshine in December - Sidney, MT
  • Average daylight in December: 8.5h

The month with the longest days is June (Average daylight: 15.9h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in December: 4.5h

The month with the most sunshine is July (Average sunshine: 11.7h).
The month with the least sunshine is February (Average sunshine: 4.3h).

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Average sunshine days in December
Sidney, MT

Average sunshine days in December - Sidney, MT
  • Average sunshine days in December: 18.7 days

The month with the most sunshine days is September (20.7 days).
The month with the least sunshine days is April (15.8 days).

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Average UV index in December
Sidney, MT

Average UV index in December - Sidney, 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 and February (UV index 1).

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Average cloud cover in December
Sidney, MT

Average cloud cover in December - Sidney, MT
  • Average cloud cover in December: 53

The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is July (Cloud cover 18).

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Average visibility in December
Sidney, MT

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

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

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