Last updated: June 24, 2025
In December, the average temperature in Setauket-East Setauket, 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 Setauket-East Setauket, 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 Setauket-East Setauket in December, the total precipitation amount is 140 mm (5.5 in), occurring over a span of 11 days.
In Setauket-East Setauket 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 Setauket-East Setauket 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 Setauket-East Setauket, you can visit Hourly UV Index in Setauket-East Setauket.
UV Risk Categories
Weather in Setauket-East Setauket varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Setauket-East Setauket, 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 |