Last updated: June 24, 2025
In December, the average temperature in Barstow Heights, United States hovers around 9°C (48°F). Visitors should be prepared for a range of temperatures, as it can dip as low as -3°C (28°F) and rise to a pleasant 22°C (72°F). With an average precipitation of 23 mm (0.9 in) over just 2 days, and a humidity level reaching 75%, the climate creates a unique atmosphere during this time.
In December in Barstow Heights, the average temperature is 9°C (48°F). The maximum can reach 22°C (72°F), while the minimum can dip as low as -3°C (28°F). This temperature range makes Barstow Heights an ideal destination for travelers seeking a mix of mild weather and the possibility of experiencing cooler conditions.
In Barstow Heights in December, the precipitation amount is 23 mm (0.9 in) over a span of 2 days.
In Barstow Heights in December humidity is 75%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill, making it essential to dress in layers for comfort while traveling.
In Barstow Heights 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 Barstow Heights for better planning.
UV Risk Categories
Weather in Barstow Heights varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Barstow Heights, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 9°C (49°F) | 21 mm (0.8 inches) | 76% | moderate |
| February Weather | 10°C (51°F) | 18 mm (0.7 inches) | 80% | high |
| March Weather | 13°C (56°F) | 18 mm (0.7 inches) | 69% | very high |
| April Weather | 18°C (64°F) | 12 mm (0.5 inches) | 57% | very high |
| May Weather | 21°C (70°F) | 4 mm (0.2 inches) | 45% | extreme |
| June Weather | 27°C (81°F) | 1 mm (0.1 inches) | 34% | extreme |
| July Weather | 30°C (87°F) | 6 mm (0.2 inches) | 29% | extreme |
| August Weather | 30°C (86°F) | 5 mm (0.2 inches) | 28% | extreme |
| September Weather | 26°C (79°F) | 2 mm (0.1 inches) | 41% | very high |
| October Weather | 19°C (66°F) | 4 mm (0.2 inches) | 54% | very high |
| November Weather | 14°C (57°F) | 7 mm (0.3 inches) | 68% | moderate |
| December Weather | 9°C (48°F) | 23 mm (0.9 inches) | 75% | moderate |