December weather forecast and climate
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
December, the first month of the winter, in Hamilton, is also a subzero cold month, with average temperature fluctuating between 14°F (-10°C) and 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

In December, the average relative humidity is 87%.

Rainfall

In Hamilton, during 12.9 rainfall days, 1.97" (50mm) of precipitation is typically accumulated. In Hamilton, during the entire year, the rain falls for 163.6 days and collects up to 20.83" (529mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall in Hamilton, Montana. In Hamilton, during December, snow falls for 18.6 days and regularly aggregates up to 10.55" (268mm) of snow. 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 8.7h of daylight.

Sunshine

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

UV index

Months with the lowest UV index in Hamilton, Montana, 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 the Sun's UV rays for average individuals.
Note: The average daily UV index of 1 in December transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged 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. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the coldest month in Hamilton?

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

What is the temperature in December in Hamilton?

In Hamilton, in December, the average high-temperature is 26.8°F (-2.9°C), and the average low-temperature is 14°F (-10°C).

What is the average humidity in December in Hamilton?

In December, the average relative humidity is 87%.

How many days does it rain in December in Hamilton?

In Hamilton, during December, the rain falls for 12.9 days and regularly aggregates up to 1.97" (50mm) of precipitation.

How much does it snow in Hamilton in December?

In Hamilton, in December, snow falls for 18.6 days, with typically accumulated 10.55" (268mm) of snow.

What is the month with the shortest days in Hamilton?

With an average of 8.7h of daylight, December has the shortest days of the year in Hamilton.

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

The average length of the day in December in Hamilton is 8.7h.

What is the month with the least sunshine in Hamilton?

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

How many hours of sunshine does Hamilton have in December?

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

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

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

What is the UV index intensity in December in Hamilton?

In December, the average daily maximum UV index in Hamilton, Montana, is 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to the Sun's UV rays.
Average temperature in December - Hamilton, MT
  • Average high temperature in December: -2.9°C

The warmest month (with the highest average high temperature) is July (25°C).
The month with the lowest average high temperature is December (-2.9°C).

  • Average low temperature in December: -10°C

The month with the highest average low temperature is August (8.3°C).
The coldest month (with the lowest average low temperature) is December (-10°C).

Average pressure in December - Hamilton, MT
  • Average pressure in December: 1022.5mbar

The month with the highest atmospheric pressure is January (1023mbar).
The month with the lowest atmospheric pressure is June (1013.7mbar).

Average wind speed in December - Hamilton, MT
  • Average wind speed in December: 8.3km/h

The windiest month (with the highest average wind speed) is January (8.6km/h).
The calmest month (with the lowest average wind speed) is August (6.6km/h).

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: 50mm

The wettest months (with the highest rainfall) are February and April (60mm).
The driest month (with the least rainfall) is August (19mm).

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: 268mm

The month with the highest snowfall is February (331mm).
Months with the least snowfall are June, July and August (0mm).

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).
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: 8.7h

The month with the longest days is June (Average daylight: 15.7h).
The month with the shortest days is December (Average daylight: 8.7h).

  • Average sunshine in December: 5.4h

Months with the most sunshine are July and August (Average sunshine: 11.7h).
Months with the least sunshine are January and December (Average sunshine: 5.4).

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: 1

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

Average visibility in December - Hamilton, MT
  • Average visibility in December: 7km

Months with the highest visibility are July and August (10km).
Months with the lowest visibility are January, February, March and December (7km).