Last updated: June 24, 2025
In December, the average temperature in Yankton, United States hovers around -2°C (28°F). During this time, you may experience a chilling minimum of -25°C (-13°F), while the mercury can rise to a comfortable maximum of 18°C (65°F). Expect about 43 mm (1.7 in) of precipitation spread across 4 days, coupled with an average humidity of 79%, creating a crisp winter ambiance.
In December in Yankton, the average temperature is -2°C (28°F). Maximum temperatures can reach 18°C (65°F) and minimums can drop to as low as -25°C (-13°F). Travelers should be prepared for a wide range of temperatures and dress accordingly for both chilly and mild conditions.
In Yankton in December, the precipitation amount is 43 mm (1.7 in) over the course of 4 days.
In Yankton in December, humidity is 79%. With an average temperature of -2°C (28°F), this humidity feels like a biting chill that penetrates through layers of clothing, making outdoor activities uncomfortable and urging travelers to seek warmth indoors.
In Yankton 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 Yankton, you can visit Hourly UV Index in Yankton.
UV Risk Categories
Weather in Yankton varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Yankton, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -5°C (23°F) | 24 mm (0.9 inches) | 77% | moderate |
| February Weather | -5°C (22°F) | 25 mm (1.0 inches) | 81% | moderate |
| March Weather | 3°C (38°F) | 77 mm (3.0 inches) | 71% | high |
| April Weather | 8°C (46°F) | 80 mm (3.1 inches) | 75% | very high |
| May Weather | 15°C (60°F) | 154 mm (6.1 inches) | 74% | very high |
| June Weather | 23°C (74°F) | 90 mm (3.5 inches) | 82% | extreme |
| July Weather | 25°C (77°F) | 88 mm (3.5 inches) | 84% | very high |
| August Weather | 23°C (73°F) | 95 mm (3.8 inches) | 82% | very high |
| September Weather | 20°C (67°F) | 77 mm (3.0 inches) | 75% | very high |
| October Weather | 10°C (50°F) | 76 mm (3.0 inches) | 72% | moderate |
| November Weather | 3°C (38°F) | 22 mm (0.9 inches) | 81% | moderate |
| December Weather | -2°C (28°F) | 43 mm (1.7 inches) | 79% | low |