January weather forecast
Idaho, USA

January is the heart of winter in Idaho, and it often stands out as one of the coldest months of the year. The state's diverse topography means weather conditions can vary considerably across regions. The highlands, such as the areas around Borah Peak and the Sawtooth Range, are blanketed in snow, with temperatures frequently dipping to below freezing. In fact, Island Park Dam holds the record for Idaho's lowest ever recorded temperature of -60°F (-51.1°C) on January 18, 1943.

Cities in the western and northern parts, influenced by the maritime effect of the Pacific Ocean, experience chilly temperatures paired with a higher probability of precipitation. Conversely, eastern cities, away from the ocean's influence, can be drier but equally cold. The capital city, Boise, typically has temperatures ranging from the low to mid-20s°F in January, making it slightly milder compared to the colder highlands.

When juxtaposed with December, January's temperatures remain relatively consistent, but there's often a slight uptick in snowfall, especially in mountainous areas. Comparatively, February, while still cold, tends to show the initial signs of transition towards spring, with marginally warmer temperatures and reduced snowfall in many areas.

During January, fog becomes a recurring phenomenon in various regions, especially in the early morning hours, impacting visibility significantly. This fog can be particularly dense in areas near major rivers such as the Snake and Clearwater, resulting in picturesque, frosty landscapes. Overall, January in Idaho is emblematic of a classic winter month, complete with snowy terrains and brisk temperatures.

---

• Boise - January »
  In Boise, Idaho, during January, the rain falls for 10.5 days and regularly aggregates up to 2.05" (52mm) of precipitation. In Boise, in January, during 8.2 snowfall days, 6.54" (166mm) of snow is typically accumulated.
• Meridian - January »
  In Meridian, in January, snow falls for 6.8 days, with typically accumulated 4.21" (107mm) of snow. In Meridian, in January, during 6.8 snowfall days, 4.21" (107mm) of snow is typically accumulated.
• Nampa - January »
  The month with the most snowfall in Nampa is January, when snow falls for 6.1 days and typically aggregates up to 3.23" (82mm) of snow. January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Nampa.
• Idaho Falls - January »
  The month with the most snowfall in Idaho Falls is January, when snow falls for 12.8 days and typically aggregates up to 3.86" (98mm) of snow. In Idaho Falls in January, during 12.8 snowfall days, 3.86" (98mm) of snow is typically accumulated.
• Pocatello - January »
  The month with the most snowfall in Pocatello is January, when snow falls for 15.6 days and typically aggregates up to 8.27" (210mm) of snow. January ushers in an average high-temperature of a still subzero cold 30.2°F (-1°C) in Pocatello, Idaho, aligning closely with the preceding month.
• Caldwell - January »
  In Caldwell, Idaho, during January, snow falls for 5.6 days and regularly aggregates up to 2.8" (71mm) of snow. In January, in Caldwell the rain falls for 9.8 days.
• Coeur d'Alene - January »
  January is the most humid month in Coeur d'Alene with an average relative humidity of 93%. January is the most humid month in Coeur d'Alene with an average relative humidity of 93%.
• Twin Falls - January »
  The month with the most snowfall in Twin Falls is January, when snow falls for 8.9 days and typically aggregates up to 5.04" (128mm) of snow. In Twin Falls, in January, snow falls for 8.9 days, with typically accumulated 5.04" (128mm) of snow.
• Lewiston - January »
  In Lewiston during January, snow falls for 4.8 days and regularly aggregates up to 2.56" (65mm) of snow. In Lewiston in January, during 14.5 rainfall days, 1.69" (43mm) of precipitation is typically accumulated.
• Post Falls - January »
  The month with the most snowfall in Post Falls is January, when snow falls for 16.4 days and typically aggregates up to 16.57" (421mm) of snow. The month with the most snowfall in Post Falls is January, when snow falls for 16.4 days and typically aggregates up to 16.57" (421mm) of snow.
• Rexburg - January »
  In Rexburg during January, the rain falls for 6.9 days and regularly aggregates up to 1.1" (28mm) of precipitation. In Rexburg, during January, snow falls for 18.1 days and regularly aggregates up to 8.9" (226mm) of snow.
• Moscow - January »
  In Moscow, in January, snow falls for 13.7 days, with typically accumulated 12.56" (319mm) of snow. In Moscow, during January, the rain falls for 10.9 days and regularly aggregates up to 2.52" (64mm) of precipitation.