Last updated: June 24, 2025
In December, the average temperature in Idaho City, United States hovers around -4°C (25°F), with occasional extremes ranging from a chilling -24°C (-11°F) to a mild 11°C (52°F). Expect 85 mm (3.4 in) of precipitation spread over 13 days, complemented by high humidity levels averaging 87%. Be prepared for a brisk and damp month!
In December in Idaho City, the average temperature is -4°C (25°F). Maximums can reach 11°C (52°F), while minimums can drop as low as -24°C (-11°F). Be prepared for a wide temperature range when traveling during this month in Idaho City.
In Idaho City in December, the total precipitation amount is 85 mm (3.4 in), which occurs over the span of 13 days.
In Idaho City in December humidity is 87%. With an average temperature of -4°C (25°F), this humidity feels like a biting chill that clings to your skin, making every step outside feel like an endeavor as the cold damp air numbs your senses and weighs you down, creating an atmosphere that is both invigorating and challenging for traveling.
In Idaho City in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Idaho City, you can visit Hourly UV Index in Idaho City.
UV Risk Categories
Weather in Idaho City varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Idaho City, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (25°F) | 98 mm (3.9 inches) | 88% | moderate |
| February Weather | -3°C (26°F) | 126 mm (5.0 inches) | 89% | moderate |
| March Weather | 1°C (35°F) | 90 mm (3.6 inches) | 85% | high |
| April Weather | 4°C (40°F) | 79 mm (3.1 inches) | 79% | very high |
| May Weather | 9°C (49°F) | 68 mm (2.7 inches) | 71% | extreme |
| June Weather | 15°C (60°F) | 47 mm (1.8 inches) | 71% | extreme |
| July Weather | 21°C (70°F) | 5 mm (0.2 inches) | 66% | extreme |
| August Weather | 20°C (68°F) | 20 mm (0.8 inches) | 50% | very high |
| September Weather | 14°C (58°F) | 31 mm (1.2 inches) | 48% | very high |
| October Weather | 6°C (43°F) | 51 mm (2.0 inches) | 65% | high |
| November Weather | 1°C (33°F) | 77 mm (3.0 inches) | 84% | moderate |
| December Weather | -4°C (25°F) | 85 mm (3.4 inches) | 87% | low |