Last updated: June 24, 2025
In Helena, United States, the average temperature in January hovers around -7°C (20°F). Expect chilling lows of -26°C (-15°F) and occasionally mild highs of 4°C (40°F). With around 23 mm (0.9 in) of precipitation spread over 6 days, the air remains notably humid at an average of 87%, making it essential to bundle up during this cold month!
In January in Helena, the average temperature is -7°C (20°F), with maximums reaching 4°C (40°F) and minimums plummeting to -26°C (-15°F). Travelers should be prepared for extremely cold conditions and dress warmly during this time.
In Helena in January, the precipitation amount is 23 mm (0.9 in) spread over 6 days.
In Helena in January humidity is 87%. With an average temperature of -7°C (20°F), this humidity feels like a biting chill that penetrates through layers of clothing, making outdoor exploration daunting and uncomfortable for travelers.
In Helena 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 Helena, you can check the information here.
UV Risk Categories
Weather in Helena varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Helena, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | -7°C (20°F) | 23 mm (0.9 inches) | 87% | moderate |
February Weather | -9°C (16°F) | 51 mm (2.0 inches) | 88% | moderate |
March Weather | -2°C (29°F) | 38 mm (1.5 inches) | 83% | high |
April Weather | 2°C (36°F) | 67 mm (2.7 inches) | 78% | very high |
May Weather | 9°C (48°F) | 88 mm (3.5 inches) | 76% | very high |
June Weather | 14°C (58°F) | 107 mm (4.2 inches) | 78% | extreme |
July Weather | 19°C (67°F) | 31 mm (1.2 inches) | 77% | very high |
August Weather | 18°C (65°F) | 34 mm (1.3 inches) | 71% | very high |
September Weather | 13°C (55°F) | 44 mm (1.7 inches) | 68% | very high |
October Weather | 4°C (40°F) | 41 mm (1.6 inches) | 72% | moderate |
November Weather | -1°C (30°F) | 33 mm (1.3 inches) | 84% | moderate |
December Weather | -6°C (21°F) | 33 mm (1.3 inches) | 90% | low |