Last updated: June 24, 2025
In December, the average temperature in Delmar, United States hovers around -1°C (31°F). Expect chilly days, with temperatures dipping as low as -21°C (-6°F), while occasionally peaking at a mild 20°C (69°F). This month, you'll see about 47 mm (1.8 in) of precipitation over the course of 6 days, accompanied by a high average humidity of 84%.
In December in Delmar, the average temperature is -1°C (31°F), with maximums reaching 20°C (69°F) and minimums dipping as low as -21°C (-6°F). Travelers should be prepared for a wide range of temperatures during this time.
In Delmar in December, the total precipitation amount is 47 mm (1.8 in) spread over the course of 6 days.
In Delmar in December humidity is 84%. With an average temperature of -1°C (31°F), this humidity feels like a biting chill that seeps through layers of clothing, making outdoor excursions brisk and invigorating, yet challenging for those unaccustomed to such damp conditions.
In Delmar 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 Delmar, you can visit Hourly UV Index in Delmar.
UV Risk Categories
Weather in Delmar varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Delmar, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -5°C (22°F) | 54 mm (2.1 inches) | 81% | moderate |
| February Weather | -4°C (25°F) | 58 mm (2.3 inches) | 81% | moderate |
| March Weather | 4°C (39°F) | 77 mm (3.1 inches) | 81% | high |
| April Weather | 9°C (48°F) | 96 mm (3.8 inches) | 82% | very high |
| May Weather | 16°C (61°F) | 141 mm (5.6 inches) | 78% | very high |
| June Weather | 22°C (73°F) | 122 mm (4.8 inches) | 81% | very high |
| July Weather | 24°C (76°F) | 78 mm (3.1 inches) | 79% | very high |
| August Weather | 22°C (73°F) | 92 mm (3.6 inches) | 77% | very high |
| September Weather | 19°C (67°F) | 120 mm (4.7 inches) | 78% | very high |
| October Weather | 12°C (53°F) | 113 mm (4.4 inches) | 78% | high |
| November Weather | 3°C (38°F) | 48 mm (1.9 inches) | 87% | moderate |
| December Weather | -1°C (31°F) | 47 mm (1.8 inches) | 84% | low |