Last updated: June 24, 2025
In Ackley, United States, the average temperature in December hovers around -2°C (29°F). However, temperatures can swing dramatically, with minimums reaching -22°C (-8°F) and maximums soaring to 22°C (72°F). Expect 34 mm (1.3 in) of precipitation over 5 days, and don't forget to prepare for a high average humidity of 83%.
In December in Ackley, the average temperature is -2°C (29°F). The maximum can reach 22°C (72°F) and the minimum can be as low as -22°C (-8°F). Travelers should be prepared for a wide range of temperatures during this time.
In Ackley in December, the precipitation amount is 34 mm (1.3 in) over the course of 5 days.
In Ackley 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 Ackley 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 Ackley, you can check the information here.
UV Risk Categories
Weather in Ackley varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Ackley, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -7°C (20°F) | 39 mm (1.5 inches) | 82% | moderate |
| February Weather | -6°C (21°F) | 48 mm (1.9 inches) | 84% | moderate |
| March Weather | 3°C (37°F) | 72 mm (2.8 inches) | 80% | high |
| April Weather | 8°C (47°F) | 83 mm (3.3 inches) | 81% | very high |
| May Weather | 16°C (61°F) | 149 mm (5.9 inches) | 74% | very high |
| June Weather | 23°C (73°F) | 121 mm (4.8 inches) | 80% | extreme |
| July Weather | 24°C (75°F) | 104 mm (4.1 inches) | 80% | very high |
| August Weather | 22°C (72°F) | 95 mm (3.7 inches) | 77% | very high |
| September Weather | 19°C (67°F) | 117 mm (4.6 inches) | 75% | very high |
| October Weather | 11°C (51°F) | 126 mm (5.0 inches) | 80% | high |
| November Weather | 2°C (37°F) | 47 mm (1.8 inches) | 87% | moderate |
| December Weather | -2°C (29°F) | 34 mm (1.3 inches) | 83% | moderate |