Last updated: June 24, 2025
In January, the average temperature in Sullivan, United States is a brisk 1°C (33°F). Expect a chilly minimum of -20°C (-3°F) and a mild maximum reaching 20°C (68°F). With 76 mm (3.0 in) of precipitation spread over 8 days, be prepared for some wet spells. The average humidity sits at a damp 82%, adding to the cool atmosphere.
In January in Sullivan, the average temperature is 1°C (33°F). Maximum temperatures can reach 20°C (68°F), while the minimum can drop as low as -20°C (-3°F). It's advisable to pack for both warmth and mild conditions for your travels.
In Sullivan in January, the precipitation amount is 76 mm (3.0 in) spread over a duration of 8 days.
In Sullivan in January humidity is 82%. With an average temperature of 1°C (33°F), this humidity feels like a biting chill that dampens your clothes and makes each breath a bit heavier, making travel uncomfortable and necessitating extra layers for warmth and protection against the moisture.
In Sullivan 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 Sullivan, you can check the information here.
UV Risk Categories
Weather in Sullivan varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Sullivan, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | 1°C (33°F) | 76 mm (3.0 inches) | 82% | moderate |
February Weather | 2°C (36°F) | 84 mm (3.3 inches) | 80% | moderate |
March Weather | 8°C (48°F) | 128 mm (5.1 inches) | 80% | high |
April Weather | 13°C (55°F) | 132 mm (5.2 inches) | 80% | very high |
May Weather | 19°C (66°F) | 165 mm (6.5 inches) | 82% | very high |
June Weather | 24°C (76°F) | 87 mm (3.4 inches) | 83% | extreme |
July Weather | 26°C (79°F) | 100 mm (3.9 inches) | 81% | extreme |
August Weather | 24°C (76°F) | 126 mm (5.0 inches) | 80% | very high |
September Weather | 22°C (72°F) | 53 mm (2.1 inches) | 76% | very high |
October Weather | 15°C (59°F) | 107 mm (4.2 inches) | 76% | high |
November Weather | 7°C (45°F) | 68 mm (2.7 inches) | 85% | moderate |
December Weather | 4°C (40°F) | 56 mm (2.2 inches) | 86% | moderate |