Last updated: June 24, 2025
In December, the average temperature in Rensselaer, United States hovers around 1°C (35°F). Be prepared for a wintery chill, with temperatures dipping as low as -23°C (-9°F) and occasionally soaring to a pleasant 18°C (65°F). Expect some wet weather, with 58 mm (2.3 in) of precipitation expected over 8 days, and don't forget to bundle up, as the average humidity sits at a brisk 86%.
In December in Rensselaer, the average temperature is 1°C (35°F). Maximums can reach 18°C (65°F), while minimums can plunge as low as -23°C (-9°F). Be prepared for a wide range of temperatures if you plan to visit during this month.
In Rensselaer in December, the precipitation amount is 58 mm (2.3 in) over a span of 8 days.
In Rensselaer in December, humidity is 86%. With an average temperature of 1°C (35°F), this humidity feels like a biting chill that wraps around you, making outdoor exploration uncomfortable and requiring extra layers to stay warm while navigating the damp air.
In Rensselaer 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 Rensselaer, you can visit Hourly UV Index in Rensselaer.
UV Risk Categories
Weather in Rensselaer varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Rensselaer, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (28°F) | 73 mm (2.9 inches) | 85% | moderate |
| February Weather | -1°C (30°F) | 75 mm (2.9 inches) | 85% | moderate |
| March Weather | 5°C (41°F) | 102 mm (4.0 inches) | 86% | high |
| April Weather | 10°C (51°F) | 111 mm (4.4 inches) | 87% | very high |
| May Weather | 17°C (63°F) | 161 mm (6.3 inches) | 81% | very high |
| June Weather | 23°C (74°F) | 109 mm (4.3 inches) | 82% | very high |
| July Weather | 25°C (76°F) | 108 mm (4.3 inches) | 81% | very high |
| August Weather | 23°C (74°F) | 105 mm (4.2 inches) | 79% | very high |
| September Weather | 21°C (69°F) | 69 mm (2.7 inches) | 78% | very high |
| October Weather | 13°C (56°F) | 125 mm (4.9 inches) | 81% | high |
| November Weather | 5°C (41°F) | 69 mm (2.7 inches) | 89% | moderate |
| December Weather | 1°C (35°F) | 58 mm (2.3 inches) | 86% | low |