Last updated: June 24, 2025
In December, the average temperature in South Sioux City, United States hovers around -2°C (29°F), with extremes ranging from a bone-chilling -23°C (-9°F) to a surprisingly mild 19°C (67°F). Expect around 41 mm (1.6 in) of precipitation over approximately 4 days, contributing to an average humidity level of 83%. Embrace the wintery charm of this season!
In December in South Sioux City, the average temperature is -2°C (29°F), with maximums reaching up to 19°C (67°F) and minimums plummeting as low as -23°C (-9°F). This range makes it essential for travelers to prepare for both cold and relatively mild weather conditions while visiting.
In South Sioux City in December, the precipitation amount is 41 mm (1.6 in) over the course of 4 days.
In South Sioux City in December, humidity is 83%. With an average temperature of -2°C (29°F), this humidity feels like a biting chill that seeps into your bones, making travel outside feel particularly uncomfortable and brisk, as the damp air enhances the cold sensation, leaving you longing for warmth and shelter.
In South Sioux City 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 South Sioux City, you can visit Hourly UV Index in South Sioux City.
UV Risk Categories
Weather in South Sioux City varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in South Sioux City, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -5°C (23°F) | 28 mm (1.1 inches) | 80% | moderate |
| February Weather | -5°C (23°F) | 29 mm (1.2 inches) | 84% | moderate |
| March Weather | 3°C (38°F) | 81 mm (3.2 inches) | 75% | moderate |
| April Weather | 9°C (48°F) | 80 mm (3.2 inches) | 79% | very high |
| May Weather | 16°C (61°F) | 140 mm (5.5 inches) | 74% | very high |
| June Weather | 23°C (74°F) | 102 mm (4.0 inches) | 81% | extreme |
| July Weather | 25°C (77°F) | 66 mm (2.6 inches) | 82% | very high |
| August Weather | 23°C (73°F) | 109 mm (4.3 inches) | 80% | very high |
| September Weather | 20°C (68°F) | 101 mm (4.0 inches) | 75% | very high |
| October Weather | 10°C (51°F) | 77 mm (3.0 inches) | 77% | moderate |
| November Weather | 3°C (38°F) | 27 mm (1.0 inches) | 85% | moderate |
| December Weather | -2°C (29°F) | 41 mm (1.6 inches) | 83% | low |