Last updated: June 24, 2025
In December, the average temperature in Port Jefferson Station, United States hovers around 5°C (40°F). Expect chilly days with minimum temperatures dipping to -10°C (15°F), while the mercury can rise to a pleasant 17°C (62°F). Precipitation is notable, with around 140 mm (5.5 in) over 11 days, contributing to an average humidity of 80%. Make sure to pack accordingly!
In December in Port Jefferson Station, the average temperature is 5°C (40°F). Maximums can reach 17°C (62°F), while minimums can drop as low as -10°C (15°F). Be sure to pack layers to stay comfortable during your travels!
In Port Jefferson Station in December, the total precipitation amount is 140 mm (5.5 in), occurring over a span of 11 days.
In Port Jefferson Station in December, humidity is 80%. With an average temperature of 5°C (40°F), this humidity feels like a damp chill settling on your skin, making travel uncomfortable and requiring extra layers to stay warm while navigating the cool, misty atmosphere.
In Port Jefferson Station 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 Port Jefferson Station, you can visit Hourly UV Index in Port Jefferson Station.
UV Risk Categories
Weather in Port Jefferson Station varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Port Jefferson Station, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | 2°C (35°F) | 80 mm (3.1 inches) | 84% | moderate |
February Weather | 2°C (36°F) | 112 mm (4.4 inches) | 82% | moderate |
March Weather | 4°C (40°F) | 104 mm (4.1 inches) | 81% | high |
April Weather | 9°C (49°F) | 132 mm (5.2 inches) | 78% | very high |
May Weather | 14°C (58°F) | 119 mm (4.7 inches) | 69% | very high |
June Weather | 20°C (68°F) | 87 mm (3.4 inches) | 69% | very high |
July Weather | 24°C (76°F) | 131 mm (5.2 inches) | 62% | very high |
August Weather | 24°C (75°F) | 103 mm (4.0 inches) | 65% | very high |
September Weather | 21°C (70°F) | 94 mm (3.7 inches) | 68% | very high |
October Weather | 16°C (61°F) | 143 mm (5.6 inches) | 74% | high |
November Weather | 9°C (49°F) | 103 mm (4.0 inches) | 82% | moderate |
December Weather | 5°C (40°F) | 140 mm (5.5 inches) | 80% | low |