Last updated: June 24, 2025
In December, the average temperature in Seymour, United States hovers around 9°C (49°F), with fluctuations that can see lows of -6°C (21°F) and highs reaching a balmy 31°C (88°F). Rainfall is a frequent visitor, with 33 mm (1.3 in) of precipitation spread over 4 days, and the air carries a notable average humidity of 85%. Prepare accordingly for a month of varied weather!
In December in Seymour, the average temperature is 9°C (49°F), with maximums reaching 31°C (88°F) and minimums dropping as low as -6°C (21°F). This wide range makes it essential to pack for both warm and chilly conditions when traveling.
In Seymour in December, the precipitation amount is 33 mm (1.3 in) over a span of 4 days.
In Seymour in December humidity is 85%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that seeps into your bones, making every step outside a challenge as the moisture in the air weighs heavily and lingers, transforming even simple outings into a quest for comfort.
In Seymour in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Seymour for better planning.
UV Risk Categories
Weather in Seymour varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Seymour, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | 7°C (44°F) | 34 mm (1.3 inches) | 77% | moderate |
February Weather | 8°C (46°F) | 32 mm (1.3 inches) | 76% | high |
March Weather | 15°C (59°F) | 68 mm (2.7 inches) | 74% | very high |
April Weather | 18°C (65°F) | 72 mm (2.8 inches) | 75% | very high |
May Weather | 24°C (75°F) | 118 mm (4.7 inches) | 80% | extreme |
June Weather | 28°C (83°F) | 49 mm (1.9 inches) | 80% | extreme |
July Weather | 30°C (87°F) | 18 mm (0.7 inches) | 75% | extreme |
August Weather | 29°C (85°F) | 50 mm (2.0 inches) | 67% | extreme |
September Weather | 25°C (78°F) | 105 mm (4.1 inches) | 64% | very high |
October Weather | 19°C (66°F) | 74 mm (2.9 inches) | 70% | very high |
November Weather | 12°C (55°F) | 30 mm (1.2 inches) | 82% | high |
December Weather | 9°C (49°F) | 33 mm (1.3 inches) | 85% | moderate |