Last updated: June 24, 2025
In Roscommon, United States, the average temperature in December hovers around -3°C (27°F), but be prepared for extremes, as it can drop to a chilly -25°C (-12°F) or climb as high as 15°C (59°F). Expect around 63 mm (2.5 in) of precipitation over approximately 12 days, with a notably high average humidity of 89%. Stay warm and dry as you enjoy the unique ambiance of this winter wonderland!
In December in Roscommon, the average temperature is -3°C (27°F). Maximums can reach 15°C (59°F) and minimums can be as low as -25°C (-12°F). It's advisable to pack warm clothing and be prepared for a wide range of temperatures when traveling to Roscommon during this time.
In Roscommon in December, the total precipitation amount reaches 63 mm (2.5 in) over the course of 12 days.
In Roscommon in December, humidity is 89%. With an average temperature of -3°C (27°F), this humidity feels like a biting chill that seeps into your bones, making outdoor activities uncomfortable and breath a visible frost as you navigate through the wintery landscape.
In Roscommon 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 Roscommon, you can visit Hourly UV Index in Roscommon.
UV Risk Categories
Weather in Roscommon varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Roscommon, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (21°F) | 50 mm (2.0 inches) | 92% | low |
| February Weather | -6°C (21°F) | 52 mm (2.1 inches) | 91% | moderate |
| March Weather | -1°C (31°F) | 54 mm (2.1 inches) | 87% | moderate |
| April Weather | 5°C (42°F) | 93 mm (3.7 inches) | 85% | very high |
| May Weather | 13°C (56°F) | 107 mm (4.2 inches) | 79% | very high |
| June Weather | 19°C (66°F) | 118 mm (4.6 inches) | 75% | very high |
| July Weather | 21°C (71°F) | 87 mm (3.4 inches) | 75% | very high |
| August Weather | 20°C (68°F) | 90 mm (3.6 inches) | 75% | very high |
| September Weather | 16°C (61°F) | 73 mm (2.9 inches) | 79% | high |
| October Weather | 9°C (49°F) | 118 mm (4.6 inches) | 85% | moderate |
| November Weather | 1°C (35°F) | 61 mm (2.4 inches) | 88% | moderate |
| December Weather | -3°C (27°F) | 63 mm (2.5 inches) | 89% | low |