December weather forecast and climate
Eureka, MT

Weather in December

December, the first month of the winter, in Eureka, is still a freezing cold month, with average temperature fluctuating between 25.5°F (-3.6°C) and 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

The average relative humidity in Eureka is 93%.

Rainfall

In Eureka, during 8.6 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. In Eureka, during the entire year, the rain falls for 136.3 days and collects up to 15.35" (390mm) of precipitation.

Snowfall

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

Daylight

With an average of 8.3h of daylight, December has the shortest days of the year.

Sunshine

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

UV index

Months with the lowest UV index in Eureka are January, February, November and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health hazard from the exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 1 interpret into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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 coldest month in Eureka?

December is the coldest month in Eureka, 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 average humidity in December in Eureka?

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

How many days does it rain in December in Eureka?

In December, in Eureka, Montana, the rain falls for 8.6 days. Throughout December, 1.73" (44mm) of precipitation is accumulated.

How many days does it snow in December in Eureka?

In Eureka, Montana, in December, snow falls for 22.1 days, with typically accumulated 9.41" (239mm) of snow.

What is the month with the shortest days in Eureka?

The month with the shortest days in Eureka is December, with an average of 8.3h of daylight.

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

The average length of the day in December in Eureka, Montana, is 8.3h.

How long on average sun shines in December in Eureka?

The average sunshine in December in Eureka is 3.5h.

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

Months with the lowest UV index in Eureka are January, February, November and December, with an average maximum UV index of 1.

What is the UV index reading in December in Eureka?

The average daily maximum UV index in December in Eureka, Montana, is 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from the exposure to the Sun's UV rays.

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).

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Average pressure in December
Eureka, MT

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

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

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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).

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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%).

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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").

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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).

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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").
Months with the least snowfall are June, July and August (0").

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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).
Months with the least snowfall days are June, July and August (0 days).

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

Average daylight in December / Average sunshine in December - Eureka, MT
  • Average daylight in December: 8.3h

The month with the longest days is June (Average daylight: 16.1h).
The month with the shortest days is December (Average daylight: 8.3h).

  • Average sunshine in December: 3.5h

The month with the most sunshine is August (Average sunshine: 11.7h).
The month with the least sunshine is January (Average sunshine: 3.1h).

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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).

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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).
Months with the lowest UV index are January, February, November and December (UV index 1).

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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).

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Average visibility in December
Eureka, MT

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

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

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