Last updated: June 24, 2025
In December, the average temperature in Gratis, United States hovers around 2°C (37°F). Expect chilly days, with minimums dropping as low as -18°C (0°F), while the mercury may peak at a mild 19°C (66°F). With an average humidity of 87%, the air can feel quite damp. Be prepared for precipitation, too, as 96 mm (3.8 in) may fall over the course of 10 days.
In December in Gratis, the average temperature is 2°C (37°F). The maximum can reach 19°C (66°F), and the minimum can be as low as -18°C (0°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both warm days and chilly nights.
In Gratis in December, the total precipitation amount is 96 mm (3.8 in) over a span of 10 days.
In Gratis in December, humidity is 87%. With an average temperature of 2°C (37°F), this humidity feels like an uncomfortable chill that seeps into your bones, making every step feel heavier and each breath a reminder of the dampness in the air, which can be quite challenging for traveling.
In Gratis in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Gratis, you can check the information here.
UV Risk Categories
Weather in Gratis varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Gratis, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (31°F) | 77 mm (3.0 inches) | 88% | moderate |
| February Weather | 1°C (34°F) | 103 mm (4.1 inches) | 88% | moderate |
| March Weather | 6°C (43°F) | 122 mm (4.8 inches) | 87% | high |
| April Weather | 11°C (52°F) | 103 mm (4.0 inches) | 85% | very high |
| May Weather | 18°C (64°F) | 137 mm (5.4 inches) | 81% | very high |
| June Weather | 22°C (72°F) | 140 mm (5.5 inches) | 82% | very high |
| July Weather | 24°C (76°F) | 111 mm (4.4 inches) | 81% | very high |
| August Weather | 23°C (74°F) | 96 mm (3.8 inches) | 73% | very high |
| September Weather | 21°C (69°F) | 88 mm (3.5 inches) | 73% | very high |
| October Weather | 14°C (58°F) | 102 mm (4.0 inches) | 78% | high |
| November Weather | 5°C (42°F) | 98 mm (3.8 inches) | 89% | moderate |
| December Weather | 2°C (37°F) | 96 mm (3.8 inches) | 87% | moderate |