Last updated: June 24, 2025
In Postville, United States, the average temperature in December hovers around -2°C (29°F). During this time, temperatures can fluctuate significantly, with a minimum low of -23°C (-9°F) and soaring up to a maximum of 20°C (69°F). Expect about 39 mm (1.5 in) of precipitation spread across 6 days, contributing to an average humidity of 82%.
In December in Postville, the average temperature is -2°C (29°F). Maximums can reach 20°C (69°F), while minimums can drop as low as -23°C (-9°F). Travelers should be prepared for a wide range of temperatures, making it essential to pack for both warmth and mild weather.
In Postville in December, the precipitation amount is 39 mm (1.5 in), occurring over the course of 6 days.
In Postville in December, humidity is 82%. With an average temperature of -2°C (29°F), this humidity feels like a frigid chill that seeps into your bones, making travel quite uncomfortable and forcing you to bundle up tightly to ward off the damp cold that lingers in the air.
In Postville 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 Postville, you can visit Hourly UV Index in Postville.
UV Risk Categories
Weather in Postville varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Postville, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -7°C (20°F) | 41 mm (1.6 inches) | 84% | moderate |
| February Weather | -6°C (21°F) | 53 mm (2.1 inches) | 85% | moderate |
| March Weather | 2°C (36°F) | 63 mm (2.5 inches) | 84% | moderate |
| April Weather | 8°C (46°F) | 78 mm (3.1 inches) | 83% | very high |
| May Weather | 15°C (60°F) | 154 mm (6.1 inches) | 75% | very high |
| June Weather | 22°C (71°F) | 134 mm (5.3 inches) | 79% | very high |
| July Weather | 23°C (75°F) | 113 mm (4.5 inches) | 75% | very high |
| August Weather | 21°C (71°F) | 97 mm (3.8 inches) | 69% | very high |
| September Weather | 18°C (65°F) | 121 mm (4.7 inches) | 74% | very high |
| October Weather | 10°C (50°F) | 136 mm (5.4 inches) | 79% | moderate |
| November Weather | 2°C (36°F) | 50 mm (2.0 inches) | 88% | moderate |
| December Weather | -2°C (29°F) | 39 mm (1.5 inches) | 82% | low |