January weather forecast
Hamilton, MT

Share
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 January

In Hamilton, Montana, January showcases winter with its chilling temperatures and frequent snowfall. Compared to December, January presents a slight decrease in temperatures and a significant hike in snowfall from 10.55" (268mm) to 11.89" (302mm). Expect cloudy skies with a high relative humidity of 89%, the highest among all months. However, this month sets the pace for the rest of the year with its weather patterns. In short, January is the epitome of a cold winter month, with relatively lower visibility due to the heavy snowfall and higher humidity.

Temperature

The average high-temperature in January, at a still subzero cold 28.8°F (-1.8°C), reveals a modest deviation from December's 26.8°F (-2.9°C). Hamilton's average low-temperature for the month of January records at a still freezing cold 16.2°F (-8.8°C).

Humidity

With an average relative humidity of 89%, January is the most humid month.

Rainfall

In Hamilton, in January, during 11.9 rainfall days, 2.05" (52mm) 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

Months with snowfall are January through May, September through December. In Hamilton, Montana, during January, snow falls for 18.6 days and regularly aggregates up to 11.89" (302mm) of snow. Throughout the year, there are 101.1 snowfall days, and 59.17" (1503mm) of snow is accumulated.

Daylight

In January, the average length of the day is 9h and 7min.
On the first day of January, sunrise is at 8:19 am and sunset at 5:00 pm. On the last day of the month, sunrise is at 8:00 am and sunset at 5:39 pm MST.

Sunshine

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

UV index

The average daily maximum UV index in January in Hamilton is 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A daily high UV index of 2 in January leads to these guidelines:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. 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

How cold is January?

During January, Hamilton experiences an average high-temperature of 28.8°F (-1.8°C) and a low-temperature of 16.2°F (-8.8°C).

What is the most humid month?

The most humid month is January, with an average relative humidity of 89%.

What is the average humidity in January?

In Hamilton, the average relative humidity in January is 89%.

How much does it rain in Hamilton in January?

In Hamilton, in January, it is raining for 11.9 days, with typically 2.05" (52mm) of accumulated precipitation.

How many days does it snow in January?

In Hamilton, during January, snow falls for 18.6 days and regularly aggregates up to 11.89" (302mm) of snow.

What is the average length of the day in January?

In January, the average day length is 9h and 7min.

When is the sunrise / sunset in January?

In January, on the first day of the month, sunrise is at 8:19 am and sunset at 5:00 pm. On the last day of the month, sunrise is at 8:00 am and sunset at 5:39 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 many hours of sunshine does Hamilton have in January?

In January, the average sunshine duration is 5.4h.

What is the UV index reading in January?

In January, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to Sun's UV rays.
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 January
Hamilton, MT

Average temperature in January - Hamilton, MT
  • Average high temperature in January: 28.8°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 January: 16.2°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 January
Hamilton, MT

Average pressure in January - Hamilton, MT
  • Average pressure in January: 30.21"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 January
Hamilton, MT

Average wind speed in January - Hamilton, MT
  • Average wind speed in January: 5.3mph

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 January
Hamilton, MT

Average humidity in January - Hamilton, MT
  • Average humidity in January: 89%

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

Average rainfall in January
Hamilton, MT

Average rainfall in January - Hamilton, MT
  • Average rainfall in January: 2.05"

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 January
Hamilton, MT

Average rainfall days in January - Hamilton, MT
  • Average rainfall days in January: 11.9 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 January
Hamilton, MT

Average snowfall in January - Hamilton, MT
  • Average snowfall in January: 11.89"

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 January
Hamilton, MT

Average snowfall days in January - Hamilton, MT
  • Average snowfall days in January: 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 January /
Average sunshine in January
Hamilton, MT

Average daylight in January / Average sunshine in January - Hamilton, MT
  • Average daylight in January: 9h and 1min

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 January: 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 January
Hamilton, MT

Average sunshine days in January - Hamilton, MT
  • Average sunshine days in January: 10.2 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 January
Hamilton, MT

Average UV index in January - Hamilton, MT
  • Average UV index in January: 2

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 January
Hamilton, MT

Average cloud cover in January - Hamilton, MT
  • Average cloud cover in January: 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 January
Hamilton, MT

Average visibility in January - Hamilton, MT
  • Average visibility in January: 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

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location