December weather forecast
Mill Iron, MT

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Weather in December

December, the first month of the winter in Mill Iron, is still a freezing cold month, with an average temperature fluctuating between 26.6°F (-3°C) and 14.9°F (-9.5°C).

Temperature

A decrease in the average high-temperature is observed during December, shifting from an icy 40.1°F (4.5°C) in November to a subzero cold 26.6°F (-3°C). In the month of December, Mill Iron experiences an average low-temperature of 14.9°F (-9.5°C).

Humidity

In Mill Iron, the average relative humidity in December is 82%.

Rainfall

The months with the least rainfall are January and December Rain falls for 3.5 days and accumulates 0.55" (14mm) of rain.

Snowfall

January through May, September through December are months with snowfall in Mill Iron. In Mill Iron, during December, snow falls for 11.3 days and regularly aggregates up to 3.35" (85mm) of snow. In Mill Iron, Montana, during the entire year, snow falls for 62.4 days and aggregates up to 21.97" (558mm) of snow.

Daylight

The month with the shortest days is December, with an average of 8h and 42min of daylight.
On the first day of the month, sunrise is at 7:18 am and sunset at 4:13 pm. On the last day of December, sunrise is at 7:38 am and sunset at 4:22 pm MST.

Sunshine

February and December, with an average of 4.8h of sunshine, are months with the least sunshine.

UV index

The months with the lowest UV index in Mill Iron are January and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for the average person.
Note: The maximum daily UV index of 1 in December interprets into the following recommendations:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
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Frequently asked questions

How cold is it in Mill Iron in December?

During December, Mill Iron experiences an average high-temperature of 26.6°F (-3°C) and a low-temperature of 14.9°F (-9.5°C). In August, the average heat index (a.k.a. 'real feel', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is computed to be 82.4°F (28°C).

What is the average humidity in December in Mill Iron?

The average relative humidity in December in Mill Iron is 82%.

What is the driest month in Mill Iron?

January and December are months with the least rain in Mill Iron, Montana, when the rain falls for 3.5 days and typically aggregates up to 0.55" (14mm) of rain.

How many days does it rain in December in Mill Iron?

In December, the rain falls for 3.5 days. Throughout December, 0.55" (14mm) of precipitation is accumulated.

How many days does it snow in December in Mill Iron?

In December, it is snowing for 11.3 days. Throughout December, 3.35" (85mm) of snow is accumulated.

What is the month with the shortest days in Mill Iron?

December has the shortest days of the year in Mill Iron, Montana, with an average of 8h and 42min of daylight.

How many hours of daylight does Mill Iron have in December?

The average day length in December in Mill Iron is 8h and 44min.

When is the sunrise / sunset in December in Mill Iron?

In December, on the first day of the month, sunrise is at 7:18 am and sunset at 4:13 pm. On the last day of the month, in Mill Iron, sunrise is at 7:38 am and sunset at 4:22 pm MST.

What are the months with the least sunshine in Mill Iron?

The months with the least sunshine in Mill Iron, Montana, are February and December, with an average of 4.8h of sunshine.

How many hours of sunshine does Mill Iron have in December?

In December, the average sunshine duration in Mill Iron is 4.8h.

What is the month with the lowest UV index in Mill Iron?

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Mill Iron.

What is the UV index intensity in December in Mill Iron?

In Mill Iron, the average daily maximum UV index in December is 1. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMJJASONDecember
Nov
December
Jan
Average high temperature
40.1°F 4.5°C
26.6°F -3°C
26.1°F -3.3°C
Average low temperature
26.8°F -2.9°C
14.9°F -9.5°C
13.3°F -10.4°C
Average pressure
30.05" 763mmHg
30.14" 766mmHg
30.15" 766mmHg
Average wind speed
11.3mph 18.2km/h
11.4mph 18.3km/h
11.8mph 19km/h
Average max. wind speed
12.2mph 19.6km/h
12.1mph 19.5km/h
12.7mph 20.4km/h
Average wind speed gusts
19mph 30.6km/h
20.1mph 32.3km/h
21.2mph 34.1km/h
Average humidity
68%
82%
85%
Average rainfall
0.63" 16mm
0.55" 14mm
0.55" 14mm
Average rainfall days
3.7
3.5
3.1
Average snowfall
3.31" 84mm
3.35" 85mm
2.95" 75mm
Average snowfall days
7
11.3
11.7
Average daylight
9h 3min
8h 4min
9h 1min
Average sunshine
5h 5min
4h 5min
4h 5min
Average sunshine days
19.7
17.7
17.3
Average UV index
2
1
1
Average cloud cover
38%
50%
50%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in December
Mill Iron, MT

Average temperature in December - Mill Iron, MT
  • Average high temperature in December: 26.6°F

The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (26.1°F).

  • Average low temperature in December: 14.9°F

The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (13.3°F).

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Average pressure in December
Mill Iron, MT

Average pressure in December - Mill Iron, MT
  • Average pressure in December: 30.14"Hg

The months with the highest atmospheric pressure are January and February (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

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Average wind speed in December
Mill Iron, MT

Average wind speed in December - Mill Iron, MT
  • Average wind speed in December: 11.4mph

The windiest months (with the highest average wind speed) are April and October (11.9mph).
The calmest months (with the lowest average wind speed) are July and August (10.1mph).

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Average humidity in December
Mill Iron, MT

Average humidity in December - Mill Iron, MT
  • Average humidity in December: 82%

The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (46%).

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Average rainfall in December
Mill Iron, MT

Average rainfall in December - Mill Iron, MT
  • Average rainfall in December: 0.55"

The wettest month (with the highest rainfall) is May (2.6").
The driest months (with the least rainfall) are January and December (0.55").

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Average rainfall days in December
Mill Iron, MT

Average rainfall days in December - Mill Iron, MT
  • Average rainfall days in December: 3.5 days

The month with the highest number of rainy days is May (15.7 days).
The month with the least rainy days is January (3.1 days).

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Average snowfall in December
Mill Iron, MT

Average snowfall in December - Mill Iron, MT
  • Average snowfall in December: 3.35"

The month with the highest snowfall is February (3.86").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in December
Mill Iron, MT

Average snowfall days in December - Mill Iron, MT
  • Average snowfall days in December: 11.3 days

The month with the highest number of snowfall days is February (12 days).
The months with the least snowfall days are July and August (0 days).

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Average daylight in December /
Average sunshine in December
Mill Iron, MT

Average daylight in December / Average sunshine in December - Mill Iron, MT
  • Average daylight in December: 8h and 4min

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

  • Average sunshine in December: 4h and 5min

The months with the most sunshine are July and August (Average sunshine: 11h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).

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Average sunshine days in December
Mill Iron, MT

Average sunshine days in December - Mill Iron, MT
  • Average sunshine days in December: 17.7 days

The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is June (11.9 days).

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Average UV index in December
Mill Iron, MT

Average UV index in December - Mill Iron, MT
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in December
Mill Iron, MT

Average cloud cover in December - Mill Iron, MT
  • Average cloud cover in December: 50

The month with the most cloud cover is February (Cloud cover 51).
The months with the least cloud cover are July and August (Cloud cover 18).

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Average visibility in December
Mill Iron, MT

Average visibility in December - Mill Iron, MT
  • Average visibility in December: 6mi

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

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Mill Iron, Montana, USA

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