Last updated: June 24, 2025
In Sidney, United States, the average temperature in December hovers around -6°C (22°F). Expect to experience a range from a chilling -33°C (-27°F) to a surprisingly warmer 18°C (64°F). During this period, the region typically sees 18 mm (0.7 in) of precipitation spread over 4 days, coupled with an average humidity level of 84%. Be prepared for a cold and damp month!
In December in Sidney, the average temperature is -6°C (22°F). The maximum can reach 18°C (64°F), while the minimum can drop to as low as -33°C (-27°F). Travelers should be prepared for a wide range of temperatures during this time.
In Sidney in December, the total precipitation amount is 18 mm (0.7 in) spread over a duration of 4 days.
In Sidney in December humidity is 84%. With an average temperature of -6°C (22°F), this humidity feels like an unpleasant chill that seeps into your bones, making travel feel much more uncomfortable and harsh than the temperature alone suggests.
In Sidney 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 Sidney, you can visit Hourly UV Index in Sidney.
UV Risk Categories
Weather in Sidney varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Sidney, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (17°F) | 10 mm (0.4 inches) | 83% | low |
| February Weather | -11°C (13°F) | 22 mm (0.8 inches) | 86% | moderate |
| March Weather | -1°C (31°F) | 21 mm (0.8 inches) | 77% | moderate |
| April Weather | 5°C (41°F) | 25 mm (1.0 inches) | 72% | very high |
| May Weather | 13°C (55°F) | 53 mm (2.1 inches) | 77% | very high |
| June Weather | 19°C (67°F) | 67 mm (2.6 inches) | 79% | very high |
| July Weather | 23°C (73°F) | 38 mm (1.5 inches) | 78% | very high |
| August Weather | 21°C (70°F) | 39 mm (1.5 inches) | 74% | very high |
| September Weather | 15°C (60°F) | 60 mm (2.3 inches) | 68% | high |
| October Weather | 6°C (43°F) | 30 mm (1.2 inches) | 70% | moderate |
| November Weather | -1°C (31°F) | 19 mm (0.7 inches) | 80% | moderate |
| December Weather | -6°C (22°F) | 18 mm (0.7 inches) | 84% | low |