December weather forecast
Hamilton, MT

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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

Finally rounding off the year, December in Hamilton is marked by a heavy drop in temperatures, the advent of more snowfall, and a noticeable decrease in daylight hours. The snowfall increases significantly from November's 6.18" (157mm) to December's 10.55" (268mm). As the heart of winter, it creates a magical holiday season with its snowy landscapes and frosted trees. Despite the decrease in sunshine hours and daylight, December’s weather brings with it an entirely different charm - a white winter heralding the end of the year and the beginning of new hopes for the next.

Temperature

Hamilton's temperature records reveal December as the coldest month, marked by average highs of 26.8°F (-2.9°C) and lows of 14°F (-10°C).

Humidity

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

Rainfall

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

Snowfall

January through May, September through December are months with snowfall. In December, it is snowing for 18.6 days. Throughout December, 10.55" (268mm) of snow is 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 is December, with an average of 8h and 42min of daylight.
On the first day of December, sunrise is at 7:59 am and sunset at 4:52 pm. On the last day of the month, sunrise is at 8:19 am and sunset at 5:00 pm MST.

Sunshine

The months with the least sunshine are January and December, with an average of 5.4h of 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 estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 1 in December transforms into the following instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Updated: Aug 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the coldest months?

Hamilton's coldest month, December, generally records average temperatures ranging from a high of 26.8°F (-2.9°C) to a low of 14°F (-10°C).

How cold is it in December?

The high-temperature, in December, in Hamilton, is 26.8°F (-2.9°C), while the low-temperature averages to 14°F (-10°C).

What is the average humidity in December?

In December, the average relative humidity is 87%.

How many days does it rain in December?

In Hamilton, in December, it is raining for 12.9 days, with typically 1.97" (50mm) of accumulated precipitation.

How many days does it snow in December?

In Hamilton, in December, during 18.6 snowfall days, 10.55" (268mm) of snow is typically accumulated.

What is the month with the shortest days?

With an average of 8h and 42min of daylight, December has the shortest days of the year.

What is the average length of the day in December?

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

When are sunrise and sunset in December?

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, sunrise is at 8:19 am and sunset at 5:00 pm MST.

What is the month with the least sunshine?

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

How long on average sun shines in December?

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

When is the lowest UV index?

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

How high is the UV index in December?

In December, the average daily maximum UV index is 1. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's 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).

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).

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).

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%).

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").

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).

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").

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).

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 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: 5h and 2min

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).

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).

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).

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).

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).

Hamilton, Montana, USA

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