Last updated: June 24, 2025
In Heron Lake, United States, the average temperature in December hovers around -4°C (25°F). During this time, you can expect a minimum plunge of -25°C (-12°F) and a maximum rise to 17°C (63°F). With 41 mm (1.6 in) of precipitation spread over 5 days, the weather tends to be quite damp, complemented by an average humidity of 83%.
In December in Heron Lake, the average temperature is -4°C (25°F), with maximums reaching 17°C (63°F) and minimums dropping as low as -25°C (-12°F). It's essential to pack for a wide range of temperatures and be prepared for cold weather while traveling during this time.
In Heron Lake in December, the precipitation amount is 41 mm (1.6 in) over a period of 5 days.
In Heron Lake in December, humidity is 83%. With an average temperature of -4°C (25°F), this humidity feels like a chilling fog enveloping you, making every breath feel heavy and damp, which can quickly dampen the spirit of travel as you navigate the frosty landscape.
In Heron Lake 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 Heron Lake, you can check the information here.
UV Risk Categories
Weather in Heron Lake varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Heron Lake, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (18°F) | 31 mm (1.2 inches) | 80% | moderate |
| February Weather | -8°C (17°F) | 31 mm (1.2 inches) | 84% | moderate |
| March Weather | 1°C (34°F) | 68 mm (2.7 inches) | 75% | high |
| April Weather | 6°C (44°F) | 91 mm (3.6 inches) | 79% | very high |
| May Weather | 15°C (59°F) | 125 mm (4.9 inches) | 74% | very high |
| June Weather | 22°C (72°F) | 127 mm (5.0 inches) | 81% | extreme |
| July Weather | 23°C (74°F) | 102 mm (4.0 inches) | 82% | very high |
| August Weather | 21°C (70°F) | 115 mm (4.5 inches) | 80% | very high |
| September Weather | 18°C (65°F) | 110 mm (4.3 inches) | 75% | very high |
| October Weather | 9°C (48°F) | 92 mm (3.6 inches) | 77% | moderate |
| November Weather | 1°C (34°F) | 31 mm (1.2 inches) | 85% | moderate |
| December Weather | -4°C (25°F) | 41 mm (1.6 inches) | 83% | moderate |