Last updated: June 24, 2025
In Hartsdale, United States, the average temperature in December hovers around 3°C (38°F). Weather enthusiasts should prepare for a range of -12°C (11°F) to a pleasant 17°C (63°F), showcasing the month's variability. With 111 mm (4.4 in) of precipitation spread over 11 days, expect high humidity levels averaging at 80%. Be ready for both chill and the occasional drizzle!
In December in Hartsdale, the average temperature is a chilly 3°C (38°F), with maximums reaching a mild 17°C (63°F) and minimums dropping to a frigid -12°C (11°F). Be sure to pack warm clothing and be prepared for a range of temperatures when traveling during this time.
In Hartsdale in December, the precipitation amount is 111 mm (4.4 in), occurring over the course of 11 days.
In Hartsdale in December, humidity is 80%. With an average temperature of 3°C (38°F), this humidity feels like a chilly dampness that clings to your skin, making traveling uncomfortable and forcing you to bundle up just to step outside.
In Hartsdale 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 Hartsdale, you can visit Hourly UV Index in Hartsdale.
UV Risk Categories
Weather in Hartsdale varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Hartsdale, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 0°C (33°F) | 69 mm (2.7 inches) | 84% | moderate |
| February Weather | 2°C (35°F) | 101 mm (4.0 inches) | 82% | moderate |
| March Weather | 5°C (41°F) | 93 mm (3.7 inches) | 81% | high |
| April Weather | 10°C (51°F) | 114 mm (4.5 inches) | 78% | very high |
| May Weather | 16°C (61°F) | 114 mm (4.5 inches) | 69% | very high |
| June Weather | 21°C (71°F) | 91 mm (3.6 inches) | 69% | very high |
| July Weather | 25°C (77°F) | 143 mm (5.6 inches) | 62% | very high |
| August Weather | 24°C (75°F) | 123 mm (4.8 inches) | 65% | very high |
| September Weather | 20°C (69°F) | 98 mm (3.8 inches) | 68% | very high |
| October Weather | 15°C (60°F) | 132 mm (5.2 inches) | 74% | high |
| November Weather | 8°C (46°F) | 86 mm (3.4 inches) | 82% | moderate |
| December Weather | 3°C (38°F) | 111 mm (4.4 inches) | 80% | low |