Last updated: June 24, 2025
In Merlin, United States, the average temperature in December hovers around 3°C (38°F). Expect chilly nights with minimums dipping to -8°C (18°F), while daytime can warm up to a pleasant 17°C (63°F). With 146 mm (5.7 in) of precipitation spread over 14 days, don’t forget your umbrella! The air is quite moist, with an average humidity of 87%, creating a refreshing yet cool atmosphere.
In December in Merlin, the average temperature is 3°C (38°F), with maximums reaching 17°C (63°F) and minimums dipping as low as -8°C (18°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both chilly and mild conditions.
In Merlin in December, the precipitation amount is 146 mm (5.7 in) over a span of 14 days.
In Merlin in December humidity is 87%. With an average temperature of 3°C (38°F), this humidity feels like a chilly blanket wrapped around you, making travel quite uncomfortable as the cold dampness seeps into your clothes and lingers in the air, often leaving you shivering and longing for warmer, drier conditions.
In Merlin 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 Merlin, you can visit Hourly UV Index in Merlin.
UV Risk Categories
Weather in Merlin varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Merlin, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 4°C (39°F) | 173 mm (6.8 inches) | 84% | moderate |
| February Weather | 4°C (39°F) | 185 mm (7.3 inches) | 85% | moderate |
| March Weather | 6°C (43°F) | 124 mm (4.9 inches) | 86% | high |
| April Weather | 9°C (49°F) | 102 mm (4.0 inches) | 83% | very high |
| May Weather | 13°C (56°F) | 51 mm (2.0 inches) | 83% | extreme |
| June Weather | 17°C (64°F) | 20 mm (0.8 inches) | 83% | extreme |
| July Weather | 21°C (71°F) | 1 mm (0.0 inches) | 78% | very high |
| August Weather | 21°C (71°F) | 5 mm (0.2 inches) | 67% | very high |
| September Weather | 17°C (63°F) | 37 mm (1.5 inches) | 66% | very high |
| October Weather | 11°C (53°F) | 49 mm (1.9 inches) | 77% | high |
| November Weather | 7°C (44°F) | 111 mm (4.4 inches) | 87% | moderate |
| December Weather | 3°C (38°F) | 146 mm (5.7 inches) | 87% | low |