December weather forecast
Hamilton, MT

A strong suspension bridge over a fast river in Hamilton, Montana, overlooking scenic trees and hilly landscapes over the other side of the shore
A strong suspension bridge over a fast river in Hamilton, Montana, overlooking scenic trees and hilly landscapes over the other side of the shore

Weather in December

The first month of the winter, December, is still a freezing cold month in Hamilton, Montana, with an average temperature ranging between min 14°F (-10°C) and max 26.8°F (-2.9°C).

Temperature

The coldest month is December, with an average high-temperature of 26.8°F (-2.9°C) and an average low-temperature of 14°F (-10°C).

Humidity

The average relative humidity in December is 87%.

Rainfall

In December, the rain falls for 12.9 days. Throughout December, 1.97" (50mm) of precipitation is accumulated. Throughout the year, there are 163.6 rainfall days, and 20.83" (529mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, September through December. In Hamilton, Montana, during 18.6 snowfall days, 10.55" (268mm) of snow is typically accumulated. Throughout the year, there are 101.1 snowfall days, and 59.17" (1503mm) of snow is accumulated.

Daylight

The month with the shortest days in Hamilton is December, with an average of 8h and 41min of daylight.
On the first day of the month, sunrise is at 7:59 am and sunset at 4:52 pm. On the last day of December, sunrise is at 8:19 am and sunset at 5:00 pm MST.

Sunshine

January and December, with an average of 5.4h of sunshine, are months with the least sunshine.

UV index

The months with the lowest UV index are February and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 1 in December 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 solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.
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FAQ

What is the coldest month in Hamilton?

December is the coldest month in Hamilton, Montana, with an average high-temperature of 26.8°F (-2.9°C) and an average low-temperature of 14°F (-10°C).

What is the average humidity in December in Hamilton?

In Hamilton, Montana, the average relative humidity in December is 87%.

How many days does it rain in December in Hamilton?

In December, in Hamilton, Montana, the rain falls for 12.9 days. Throughout December, 1.97" (50mm) of precipitation is accumulated.

How many days does it snow in December in Hamilton?

In Hamilton, during December, snow falls for 18.6 days and regularly aggregates up to 10.55" (268mm) of snow.

What is the month with the shortest days in Hamilton?

The month with the shortest days in Hamilton is December, with an average of 8h and 41min of daylight.

How many hours of daylight does Hamilton have in December?

In Hamilton, Montana, the average day length in December is 8h and 41min.

When are sunrise and sunset in December in Hamilton?

In December, on the first day of the month, sunrise is at 7:59 am and sunset at 4:52 pm. On the last day of the month, in Hamilton, sunrise is at 8:19 am and sunset at 5:00 pm MST.

What is the month with the least sunshine in Hamilton?

January and December, with an average of 5.4h of sunshine, are months with the least sunshine in Hamilton.

How long on average sun shines in December in Hamilton?

In Hamilton, Montana, the average sunshine duration in December is 5.4h.

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

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

What is the UV index reading in December in Hamilton?

In December, the average daily maximum UV index in Hamilton 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
Hamilton, MT

Average temperature in December - Hamilton, MT
  • Average high temperature in December: 26.8°F

The warmest month (with the highest average high temperature) is July (77°F).
The month with the lowest average high temperature is December (26.8°F).

  • Average low temperature in December: 14°F

The month with the highest average low temperature is August (46.9°F).
The coldest month (with the lowest average low temperature) is December (14°F).

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Average pressure in December
Hamilton, MT

Average pressure in December - Hamilton, MT
  • Average pressure in December: 30.19"Hg

The month with the highest atmospheric pressure is January (30.21"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in December
Hamilton, MT

Average wind speed in December - Hamilton, MT
  • Average wind speed in December: 5.2mph

The windiest month (with the highest average wind speed) is January (5.3mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).

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Average humidity in December
Hamilton, MT

Average humidity in December - Hamilton, MT
  • Average humidity in December: 87%

The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is August (50%).

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Average rainfall in December
Hamilton, MT

Average rainfall in December - Hamilton, MT
  • Average rainfall in December: 1.97"

The wettest months (with the highest rainfall) are February and April (2.36").
The driest month (with the least rainfall) is August (0.75").

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Average rainfall days in December
Hamilton, MT

Average rainfall days in December - Hamilton, MT
  • Average rainfall days in December: 12.9 days

The month with the highest number of rainy days is May (19.5 days).
The month with the least rainy days is July (8 days).

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Average snowfall in December
Hamilton, MT

Average snowfall in December - Hamilton, MT
  • Average snowfall in December: 10.55"

The month with the highest snowfall is February (13.03").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in December
Hamilton, MT

Average snowfall days in December - Hamilton, MT
  • Average snowfall days in December: 18.6 days

The month with the highest number of snowfall days is February (19.3 days).
The 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
Hamilton, MT

Average daylight in December / Average sunshine in December - Hamilton, MT
  • Average daylight in December: 8h and 41min

The month with the longest days is June (Average daylight: 15h and 44min).
The month with the shortest days is December (Average daylight: 8h and 41min).

  • Average sunshine in December: 5h and 24min

The months with the most sunshine are July and August (Average sunshine: 11h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).

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Average sunshine days in December
Hamilton, MT

Average sunshine days in December - Hamilton, MT
  • Average sunshine days in December: 10 days

The month with the most sunshine days is July (18.9 days).
The month with the least sunshine days is February (5.6 days).

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Average UV index in December
Hamilton, MT

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

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

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Average cloud cover in December
Hamilton, MT

Average cloud cover in December - Hamilton, MT
  • Average cloud cover in December: 48

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 13).

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Average visibility in December
Hamilton, MT

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

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

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