Last updated: June 24, 2025
In December, the average temperature in Petersburg, United States hovers around 1°C (33°F), with extremes ranging from a chilling -25°C (-13°F) to a warmer 17°C (63°F). Visitors can expect 54 mm (2.1 in) of precipitation spread over approximately 8 days, contributing to an average humidity of 86%. Whether you’re bundled up for the cold or navigating occasional rain, Petersburg in December promises a uniquely atmospheric experience.
In December in Petersburg, the average temperature is 1°C (33°F). Maximums can reach 17°C (63°F), while minimums can drop as low as -25°C (-13°F). When planning your travel, be prepared for a wide range of temperatures and dress accordingly to stay comfortable.
In Petersburg in December, the total precipitation amount reaches 54 mm (2.1 in) over a span of 8 days.
In Petersburg in December humidity is 86%. With average temperature 1°C (33°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and necessitating extra layers for warmth to counteract the dampness in the air.
In Petersburg 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 Petersburg, you can visit Hourly UV Index in Petersburg.
UV Risk Categories
Weather in Petersburg varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Petersburg, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (28°F) | 65 mm (2.6 inches) | 88% | low |
| February Weather | -2°C (29°F) | 67 mm (2.6 inches) | 87% | moderate |
| March Weather | 3°C (38°F) | 77 mm (3.0 inches) | 87% | moderate |
| April Weather | 9°C (48°F) | 89 mm (3.5 inches) | 87% | very high |
| May Weather | 16°C (60°F) | 126 mm (5.0 inches) | 81% | very high |
| June Weather | 21°C (71°F) | 86 mm (3.4 inches) | 82% | very high |
| July Weather | 24°C (75°F) | 105 mm (4.1 inches) | 81% | very high |
| August Weather | 23°C (73°F) | 73 mm (2.9 inches) | 78% | very high |
| September Weather | 19°C (67°F) | 59 mm (2.3 inches) | 78% | very high |
| October Weather | 13°C (55°F) | 99 mm (3.9 inches) | 82% | high |
| November Weather | 4°C (40°F) | 82 mm (3.2 inches) | 89% | moderate |
| December Weather | 1°C (33°F) | 54 mm (2.1 inches) | 86% | low |