Last updated: June 24, 2025
In Portville, United States, the average temperature in December hovers around -1°C (30°F). Temperatures can dip as low as -26°C (-15°F), while the mercury may rise to a maximum of 15°C (59°F). This month sees an average precipitation of 89 mm (3.5 in), spread over approximately 15 days of rain. With an average humidity of 88%, expect a chilly and damp atmosphere!
In December in Portville, the average temperature is -1°C (30°F), with maximums reaching up to 15°C (59°F) and minimums plummeting to as low as -26°C (-15°F). Be prepared for a wide range of temperatures if you plan to visit during this time.
In Portville in December, the precipitation amount is 89 mm (3.5 in) during 15 days of the month.
In Portville in December humidity is 88%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill that penetrates through your layers, making travel uncomfortable as every gust of wind becomes a sharp reminder of the cold and damp air surrounding you.
In Portville 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 Portville, you can visit Hourly UV Index in Portville.
UV Risk Categories
Weather in Portville varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Portville, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (25°F) | 82 mm (3.2 inches) | 89% | moderate |
| February Weather | -3°C (27°F) | 95 mm (3.7 inches) | 90% | moderate |
| March Weather | 1°C (34°F) | 86 mm (3.4 inches) | 89% | high |
| April Weather | 7°C (45°F) | 114 mm (4.5 inches) | 88% | very high |
| May Weather | 14°C (57°F) | 124 mm (4.9 inches) | 80% | very high |
| June Weather | 18°C (65°F) | 107 mm (4.2 inches) | 79% | very high |
| July Weather | 21°C (70°F) | 113 mm (4.5 inches) | 74% | very high |
| August Weather | 20°C (68°F) | 84 mm (3.3 inches) | 64% | very high |
| September Weather | 16°C (62°F) | 85 mm (3.3 inches) | 67% | very high |
| October Weather | 11°C (52°F) | 123 mm (4.9 inches) | 81% | high |
| November Weather | 3°C (37°F) | 89 mm (3.5 inches) | 89% | moderate |
| December Weather | -1°C (30°F) | 89 mm (3.5 inches) | 88% | low |