December weather forecast
Ennis, MT

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Weather in December

December in Ennis heralds the arrival of winter in earnest. Dramatically contrasting with November, it is characterized by cold temperatures and substantial snowfall, with an average accumulation of 6.3" (160mm) over 15.5 days. The festive air, coupled with gleaming white snow, provides a classic holiday season atmosphere. With outdoor activities considerably reduced, Ennis during December is a haven for those who enjoy cozying up indoors, making the most of the holiday ambiance.

Temperature

In Ennis, December is the coldest month, with temperatures averaging a high of 22.3°F (-5.4°C) and a low of 7.7°F (-13.5°C).

Humidity

In Ennis, the average relative humidity in December is 89%.

Rainfall

December is the month with the least rainfall in Ennis. Rain falls for 4.7 days and accumulates 0.75" (19mm) of precipitation.

Snowfall

January through December are months with snowfall in Ennis. In December, it is snowing for 15.5 days. Throughout December, 6.3" (160mm) of snow is accumulated. Throughout the year, there are 136.1 snowfall days, and 86.93" (2208mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 8h and 48min of daylight.
On the first day of December in Ennis, Montana, sunrise is at 7:46 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 8:06 am and sunset at 4:54 pm MST.

Sunshine

The average sunshine in December is 4.9h.

UV index

In December, the average daily maximum UV index in Ennis is 2. A UV Index of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In December, an average UV index of 2 transforms into the following instructions:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.

Frequently asked questions

What is the coldest month in Ennis?

December stands out as Ennis's coldest month, with an average high-temperature of 22.3°F (-5.4°C) and a low-temperature of 7.7°F (-13.5°C).

How cold is December in Ennis?

The high-temperature, in December, in Ennis, is 22.3°F (-5.4°C), while the low-temperature averages to 7.7°F (-13.5°C).

What is the average humidity in December in Ennis?

In December, the average relative humidity in Ennis is 89%.

What is the driest month in Ennis?

December is the month with the least rainfall in Ennis, Montana. Rain falls for 4.7 days and accumulates 0.75" (19mm) of precipitation.

How much does it rain in Ennis in December?

In Ennis, in December, during 4.7 rainfall days, 0.75" (19mm) of precipitation is typically accumulated.

How many days does it snow in December in Ennis?

In Ennis, during December, snow falls for 15.5 days and regularly aggregates up to 6.3" (160mm) of snow.

What is the month with the shortest days in Ennis?

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

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

The average day length in December in Ennis, Montana, is 8h and 48min.

When is the sunrise / sunset in December in Ennis?

In December, on the first day of the month, sunrise is at 7:46 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 8:06 am and sunset at 4:54 pm MST.

How long on average sun shines in December in Ennis?

In Ennis, the average sunshine duration in December is 4.9h.

How high is the UV index in December in Ennis?

In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents 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 December
Ennis, MT

Average temperature in December - Ennis, MT
  • Average high temperature in December: 22.3°F

The warmest month (with the highest average high temperature) is July (74.5°F).
The month with the lowest average high temperature is December (22.3°F).

  • Average low temperature in December: 7.7°F

The month with the highest average low temperature is August (46°F).
The coldest month (with the lowest average low temperature) is December (7.7°F).

Average pressure in December
Ennis, MT

Average pressure in December - Ennis, MT
  • Average pressure in December: 30.21"Hg

The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in December
Ennis, MT

Average wind speed in December - Ennis, MT
  • Average wind speed in December: 7mph

The windiest month (with the highest average wind speed) is January (7.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).

Average humidity in December
Ennis, MT

Average humidity in December - Ennis, MT
  • Average humidity in December: 89%

The month with the highest relative humidity is February (90%).
The month with the lowest relative humidity is August (50%).

Average rainfall in December
Ennis, MT

Average rainfall in December - Ennis, MT
  • Average rainfall in December: 0.75"

The wettest month (with the highest rainfall) is May (2.36").
The driest month (with the least rainfall) is December (0.75").

Average rainfall days in December
Ennis, MT

Average rainfall days in December - Ennis, MT
  • Average rainfall days in December: 4.7 days

The month with the highest number of rainy days is June (16.5 days).
The month with the least rainy days is November (2.9 days).

Average snowfall in December
Ennis, MT

Average snowfall in December - Ennis, MT
  • Average snowfall in December: 6.3"

The month with the highest snowfall is April (14.76").
The month with the least snowfall is August (0.08").

Average snowfall days in December
Ennis, MT

Average snowfall days in December - Ennis, MT
  • Average snowfall days in December: 15.5 days

The month with the highest number of snowfall days is April (19.9 days).
The month with the least snowfall days is August (0.3 days).

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

Average daylight in December / Average sunshine in December - Ennis, 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: 4h and 5min

The month with the most sunshine is July (Average sunshine: 11h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).

Average sunshine days in December
Ennis, MT

Average sunshine days in December - Ennis, MT
  • Average sunshine days in December: 16 days

The month with the most sunshine days is January (16.3 days).
The month with the least sunshine days is April (6.9 days).

Average UV index in December
Ennis, MT

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

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January and February (UV index 1).

Average cloud cover in December
Ennis, MT

Average cloud cover in December - Ennis, MT
  • Average cloud cover in December: 55

The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 17).

Average visibility in December
Ennis, MT

Average visibility in December - Ennis, MT
  • Average visibility in December: 4mi

The months with the highest visibility are June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).

Ennis, Montana, USA

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