December weather forecast
Eureka, MT

Weather in December

The first month of the winter, December, is also a subzero cold month in Eureka, Montana, with an average temperature ranging between max 25.5°F (-3.6°C) and min 13.1°F (-10.5°C).

Temperature

December is the coldest month, with an average high-temperature of 25.5°F (-3.6°C) and an average low-temperature of 13.1°F (-10.5°C).

Humidity

In Eureka, Montana, the average relative humidity in December is 93%.

Rainfall

In Eureka, in December, during 8.6 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. Throughout the year, in Eureka, there are 136.3 rainfall days, and 15.35" (390mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall. In December, in Eureka, it is snowing for 22.1 days. Throughout December, 9.41" (239mm) of snow is accumulated. Throughout the year, there are 110.7 snowfall days, and 46.81" (1189mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 8h and 20min of daylight.
On the first day of December in Eureka, sunrise is at 8:12 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 8:33 am and sunset at 4:53 pm MST.

Sunshine

In Eureka, the average sunshine in December is 3.5h.

UV index

January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 1 in December 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.
[Resources]

FAQ

What is the coldest month in Eureka?

December is the coldest month in Eureka, Montana, with an average high-temperature of 25.5°F (-3.6°C) and an average low-temperature of 13.1°F (-10.5°C).

What is the temperature in December in Eureka?

In Eureka, Montana, in December, the average high-temperature is 25.5°F (-3.6°C), and the average low-temperature is 13.1°F (-10.5°C).

What is the average humidity in December in Eureka?

The average relative humidity in December in Eureka, Montana, is 93%.

How much does it rain in Eureka in December?

In Eureka, in December, during 8.6 rainfall days, 1.73" (44mm) of precipitation is typically accumulated.

How much does it snow in Eureka in December?

In Eureka, during December, snow falls for 22.1 days and regularly aggregates up to 9.41" (239mm) of snow.

What is the month with the shortest days in Eureka?

The month with the shortest days in Eureka, Montana, is December, with an average of 8h and 20min of daylight.

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

In December, the average day length in Eureka, Montana, is 8h and 20min.

When are sunrise and sunset in December in Eureka?

On the first day of December, sunrise is at 8:12 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 8:33 am and sunset at 4:53 pm MST.

How many hours of sunshine does Eureka have in December?

In Eureka, Montana, the average sunshine duration in December is 3.5h.

When is the lowest UV index in Eureka?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 1.

What is the UV index reading in December in Eureka?

In December, the average daily maximum UV index in Eureka, Montana, is 1. A UV Index estimate of 2, and below, represents a minimal hazard to health 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
Eureka, MT

Average temperature in December - Eureka, MT
  • Average high temperature in December: 25.5°F

The warmest month (with the highest average high temperature) is July (77.4°F).
The month with the lowest average high temperature is December (25.5°F).

  • Average low temperature in December: 13.1°F

The month with the highest average low temperature is August (45.1°F).
The coldest month (with the lowest average low temperature) is December (13.1°F).

[Resources]

Average pressure in December
Eureka, MT

Average pressure in December - Eureka, MT
  • Average pressure in December: 30.16"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

[Resources]

Average wind speed in December
Eureka, MT

Average wind speed in December - Eureka, MT
  • Average wind speed in December: 3.4mph

The windiest month (with the highest average wind speed) is June (4.4mph).
The calmest month (with the lowest average wind speed) is December (3.4mph).

[Resources]

Average humidity in December
Eureka, MT

Average humidity in December - Eureka, MT
  • Average humidity in December: 93%

The month with the highest relative humidity is January (95%).
The month with the lowest relative humidity is August (55%).

[Resources]

Average rainfall in December
Eureka, MT

Average rainfall in December - Eureka, MT
  • Average rainfall in December: 1.73"

The wettest month (with the highest rainfall) is March (1.85").
The driest month (with the least rainfall) is August (0.39").

[Resources]

Average rainfall days in December
Eureka, MT

Average rainfall days in December - Eureka, MT
  • Average rainfall days in December: 8.6 days

The month with the highest number of rainy days is April (17 days).
The month with the least rainy days is August (6.1 days).

[Resources]

Average snowfall in December
Eureka, MT

Average snowfall in December - Eureka, MT
  • Average snowfall in December: 9.41"

The month with the highest snowfall is February (10").
The months with the least snowfall are June, July and August (0").

[Resources]

Average snowfall days in December
Eureka, MT

Average snowfall days in December - Eureka, MT
  • Average snowfall days in December: 22.1 days

The month with the highest number of snowfall days is December (22.1 days).
The months with the least snowfall days are June, July and August (0 days).

[Resources]

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

Average daylight in December / Average sunshine in December - Eureka, MT
  • Average daylight in December: 8h and 20min

The month with the longest days is June (Average daylight: 16h and 7min).
The month with the shortest days is December (Average daylight: 8h and 20min).

  • Average sunshine in December: 3h and 30min

The month with the most sunshine is August (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).

[Resources]

Average sunshine days in December
Eureka, MT

Average sunshine days in December - Eureka, MT
  • Average sunshine days in December: 8.5 days

The month with the most sunshine days is August (21.6 days).
The month with the least sunshine days is March (6.3 days).

[Resources]

Average UV index in December
Eureka, MT

Average UV index in December - Eureka, MT
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).

[Resources]

Average cloud cover in December
Eureka, MT

Average cloud cover in December - Eureka, MT
  • Average cloud cover in December: 67

The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 15).

[Resources]

Average visibility in December
Eureka, MT

Average visibility in December - Eureka, MT
  • Average visibility in December: 3mi

The months with the highest visibility are May, June, July, August and September (6mi).
The month with the lowest visibility is January (2mi).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location