Last updated: June 24, 2025
In December, the average temperature in Rock Rapids, United States hovers around -3°C (26°F), with extremes ranging from a chilling -23°C (-10°F) to a milder 15°C (60°F). Precipitation totals 38 mm (1.5 in) over 4 days, while the average humidity sits at a brisk 83%.
In December in Rock Rapids, the average temperature is -3°C (26°F), with maximums reaching up to 15°C (60°F) and minimums plummeting as low as -23°C (-10°F). Travelers should be prepared for a wide temperature range, ensuring they pack accordingly for both chilly and milder conditions.
In Rock Rapids in December, the total precipitation amount is 38 mm (1.5 in) spread over the course of 4 days.
In Rock Rapids in December, humidity is 83%. With an average temperature of -3°C (26°F), this humidity feels like a heavy blanket of cold air enveloping you, making it challenging to stay warm while traveling. The dampness seeps into your clothing, creating an uncomfortable chill that lingers even indoors, often requiring extra layers and careful planning for outdoor activities.
In Rock Rapids in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Rock Rapids, you can check the information here.
UV Risk Categories
Weather in Rock Rapids varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Rock Rapids, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -7°C (20°F) | 24 mm (0.9 inches) | 80% | low |
| February Weather | -7°C (20°F) | 27 mm (1.1 inches) | 84% | moderate |
| March Weather | 1°C (35°F) | 65 mm (2.5 inches) | 75% | moderate |
| April Weather | 7°C (45°F) | 83 mm (3.3 inches) | 79% | very high |
| May Weather | 15°C (59°F) | 124 mm (4.9 inches) | 74% | very high |
| June Weather | 22°C (73°F) | 98 mm (3.9 inches) | 81% | extreme |
| July Weather | 24°C (75°F) | 80 mm (3.1 inches) | 82% | very high |
| August Weather | 22°C (71°F) | 97 mm (3.8 inches) | 80% | very high |
| September Weather | 18°C (65°F) | 105 mm (4.1 inches) | 75% | very high |
| October Weather | 9°C (48°F) | 85 mm (3.3 inches) | 77% | moderate |
| November Weather | 1°C (35°F) | 26 mm (1.0 inches) | 85% | moderate |
| December Weather | -3°C (26°F) | 38 mm (1.5 inches) | 83% | moderate |