Last updated: June 24, 2025
In December, the average temperature in Rock Springs, United States hovers around 1°C (33°F). Expect chilly conditions, with the minimum temperature dropping to -17°C (3°F) and highs reaching up to 15°C (60°F). Over the course of the month, anticipate about 24 mm (1.0 in) of precipitation spread across 5 days. With an average humidity level of 82%, the air tends to feel quite crisp.
In December in Rock Springs, the average temperature is 1°C (33°F). Maximum temperatures can reach 15°C (60°F), while minimums can dip as low as -17°C (3°F). Travelers should be prepared for a wide range of temperatures and pack accordingly to enjoy their visit.
In Rock Springs in December, the precipitation amount is 24 mm (1.0 in) spread over the course of 5 days.
In Rock Springs in December humidity is 82%. With an average temperature of 1°C (33°F), this humidity feels like a biting chill that dampens your clothes and makes each breath a bit heavier, making travel uncomfortable and necessitating extra layers for warmth and protection against the moisture.
In Rock Springs in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Rock Springs for better planning.
UV Risk Categories
Weather in Rock Springs varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Rock Springs, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (31°F) | 27 mm (1.1 inches) | 81% | moderate |
| February Weather | 2°C (35°F) | 31 mm (1.2 inches) | 83% | high |
| March Weather | 6°C (43°F) | 32 mm (1.3 inches) | 71% | very high |
| April Weather | 12°C (53°F) | 15 mm (0.6 inches) | 61% | extreme |
| May Weather | 16°C (61°F) | 15 mm (0.6 inches) | 48% | extreme |
| June Weather | 23°C (73°F) | 5 mm (0.2 inches) | 36% | extreme |
| July Weather | 24°C (75°F) | 38 mm (1.5 inches) | 37% | extreme |
| August Weather | 23°C (74°F) | 12 mm (0.5 inches) | 46% | extreme |
| September Weather | 19°C (67°F) | 25 mm (1.0 inches) | 62% | extreme |
| October Weather | 12°C (54°F) | 21 mm (0.8 inches) | 74% | very high |
| November Weather | 6°C (44°F) | 14 mm (0.5 inches) | 82% | high |
| December Weather | 1°C (33°F) | 24 mm (1.0 inches) | 82% | moderate |