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January Weather in Idaho Falls, United States

Last updated: June 24, 2025

In Idaho Falls, United States, the average temperature in January hovers around -5°C (24°F). However, be prepared for the extremes, with minimum temperatures dipping to -26°C (-14°F) and a maximum reaching 10°C (51°F). Expect 40 mm (1.6 in) of precipitation spread over 10 days, paired with a high average humidity of 95%.

January Temperature in Idaho Falls

In January in Idaho Falls, the average temperature is -5°C (24°F). The maximum can reach 10°C (51°F), while the minimum can drop as low as -26°C (-14°F). Travelers should be prepared for a wide range of temperatures and dress in layers to stay comfortable during their visit.

January Weather in Idaho Falls: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Idaho Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Idaho Falls, January typically has an average temperature of -5°C (24°F), with highs reaching up to 10°C (51°F) and lows dropping to around -26°C (-14°F).
JanFebMarAprMayJunJulAugSepOctNovDec242737455464737161453526
Data source: Temperature data for Idaho Falls generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in Idaho Falls

In Idaho Falls in January, the precipitation amount is 40 mm (1.6 in) over a span of 10 days.

January Precipitation Trends in Idaho Falls

The chart displays monthly precipitation patterns in Idaho Falls, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Idaho Falls, January typically receives around 40 mm (1.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec404843555831111627393241
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Idaho Falls

In Idaho Falls in January humidity is 95%. With an average temperature of -5°C (24°F), this humidity feels like walking through a dense fog that clings to your skin, making every step you take in the chilly air feel even colder and more uncomfortable, creating a challenge for travelers who may not be prepared for such extreme dampness.

January Average Humidity in Idaho Falls

This chart illustrates the average monthly humidity levels in Idaho Falls, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Idaho Falls is approximately 95%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec95%95%90%81%71%64%59%49%52%69%86%91%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Idaho Falls

In Idaho Falls in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Idaho Falls, you can check the information here.

Maximum UV Index Levels in Idaho Falls for January

The chart shows the monthly maximum UV Index (UVI) for Idaho Falls in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in Idaho Falls typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3578101111109643
Data source: Idaho Falls January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How January Weather in Idaho Falls Compares to Other Months

Weather in Idaho Falls varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Idaho Falls, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Idaho Falls, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)40 mm (1.6 inches)95%moderate
February Weather-3°C (27°F)48 mm (1.9 inches)95%moderate
March Weather3°C (37°F)43 mm (1.7 inches)90%high
April Weather7°C (45°F)55 mm (2.2 inches)81%very high
May Weather12°C (54°F)58 mm (2.3 inches)71%very high
June Weather18°C (65°F)31 mm (1.2 inches)64%extreme
July Weather23°C (74°F)11 mm (0.4 inches)59%extreme
August Weather21°C (71°F)16 mm (0.6 inches)49%very high
September Weather16°C (61°F)26 mm (1.0 inches)52%very high
October Weather7°C (45°F)39 mm (1.5 inches)69%high
November Weather2°C (36°F)32 mm (1.3 inches)86%moderate
December Weather-4°C (26°F)41 mm (1.6 inches)91%moderate

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