Last updated: June 24, 2025
In December, the average temperature in Keystone Heights, United States hovers around 15°C (60°F). However, be prepared for a range: temperatures can dip as low as -3°C (27°F) or soar up to 28°C (83°F). Expect around 80 mm (3.1 in) of precipitation spread over 8 days, contributing to an average humidity level of 84%. Stay ready for a mix of weather!
In December in Keystone Heights, the average temperature is 15°C (60°F). The maximum can reach 28°C (83°F) and the minimum can be as low as -3°C (27°F). Be sure to pack layers to prepare for the wide temperature range while exploring.
In Keystone Heights in December, the precipitation amount is 80 mm (3.1 in) over a period of 8 days.
In Keystone Heights in December humidity is 84%. With an average temperature of 15°C (60°F), this humidity feels like a warm blanket wrapped around you, making outdoor exploration feel stifling and sticky, while creating a heavy air that may slow your pace and dampen your enthusiasm for sightseeing.
In Keystone Heights in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Keystone Heights.
UV Risk Categories
Weather in Keystone Heights varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Keystone Heights, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 14°C (57°F) | 44 mm (1.7 inches) | 83% | moderate |
| February Weather | 17°C (63°F) | 62 mm (2.5 inches) | 80% | very high |
| March Weather | 18°C (65°F) | 41 mm (1.6 inches) | 75% | very high |
| April Weather | 21°C (70°F) | 81 mm (3.2 inches) | 70% | extreme |
| May Weather | 24°C (76°F) | 103 mm (4.1 inches) | 68% | extreme |
| June Weather | 26°C (80°F) | 163 mm (6.4 inches) | 75% | extreme |
| July Weather | 27°C (81°F) | 190 mm (7.5 inches) | 79% | extreme |
| August Weather | 27°C (81°F) | 177 mm (7.0 inches) | 81% | extreme |
| September Weather | 26°C (80°F) | 133 mm (5.2 inches) | 83% | very high |
| October Weather | 24°C (75°F) | 78 mm (3.1 inches) | 81% | very high |
| November Weather | 18°C (64°F) | 62 mm (2.4 inches) | 82% | high |
| December Weather | 15°C (60°F) | 80 mm (3.1 inches) | 84% | moderate |