Roundup
Montana, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Roundup, MT

The first month of the winter, December, is still a cold month in Roundup, Montana, with average temperature fluctuating between 37.8°F (3.2°C) and 15.3°F (-9.3°C).

Temperature

With an average high-temperature of 37.8°F (3.2°C) and an average low-temperature of 15.3°F (-9.3°C), December is the coldest month.

Rainfall

Throughout December, in Roundup, 0.4" (10.7mm) of precipitation is accumulated. During the entire year, Roundup aggregates up to 13.5" (343.1mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. Months with the most snowfall in Roundup are January and December, with an average 5.3" (134.6mm) of accumulated snow.

Daylight

December has the shortest days of the year, with an average of 8.7h of daylight.

What is the coldest month in Roundup?

With an average high-temperature of 37.8°F (3.2°C) and an average low-temperature of 15.3°F (-9.3°C), December is the coldest month in Roundup, Montana.

What is the temperature in December in Roundup?

In December, in Roundup, the average high-temperature is 37.8°F (3.2°C), and the average low-temperature is 15.3°F (-9.3°C).

How much does it rain in Roundup in December?

Throughout December, in Roundup, Montana, 0.4" (10.7mm) of precipitation is accumulated.

How much does it snow in Roundup in December?

During December, Roundup regularly aggregates up to 5.3" (134.6mm) of snow.

What is the snowiest month in Roundup?

Months with the most snowfall are January and December, with an average 5.3" (134.6mm) of accumulated snow.

What is the month with the shortest days in Roundup?

With an average of 8.7h of daylight, December has the shortest days of the year in Roundup.

How many hours of daylight does Roundup have in December?

In Roundup, the average length of the day in December is 8.7h.
Average temperature in December - Roundup, MT
  • Average high temperature in December: 37.8°F

The warmest month (with the highest average high temperature) is July (88.9°F).
The month with the lowest average high temperature is December (37.8°F).

  • Average low temperature in December: 15.2°F

The month with the highest average low temperature is July (55.5°F).
The coldest month (with the lowest average low temperature) is December (15.2°F).

Average rainfall in December - Roundup, MT
  • Average rainfall in December: 0.4"

The wettest month (with the highest rainfall) is June (2.6").
Driest months (with the lowest rainfall) are January and February (0.3").

Average snowfall in December - Roundup, MT
  • Average snowfall in December: 5.3"

Months with the highest snowfall are January and December (5.3").
Months with the lowest snowfall are June, July, August and September (0").

Average daylight in December - Roundup, MT
  • Average daylight in December: 8.7h

The month with the longest days is June (Average daylight: 15.8h).
The month with shortest days is December (Average daylight: 8.7h).