Last updated: June 24, 2025
In Marine on Saint Croix, United States, the average temperature in December hovers around -5°C (23°F), with extremes ranging from a frigid -27°C (-16°F) to a milder 13°C (56°F). Expect about 55 mm (2.2 in) of precipitation over 7 days, contributing to an average humidity of 84%. Prepare for a chilly and damp month!
In December in Marine on Saint Croix, the average temperature is -5°C (23°F), with maximums reaching 13°C (56°F) and minimums dropping as low as -27°C (-16°F). Travelers should be prepared for a wide range of temperatures and dress in layers to stay comfortable during their visit.
In Marine on Saint Croix in December, the precipitation amount is 55 mm (2.2 in) over the course of 7 days.
In Marine on Saint Croix in December, humidity is 84%. With an average temperature of -5°C (23°F), this humidity feels like an icy blanket wrapping around you, making the cold air bite even deeper and turning travel into a brisk, challenging adventure where each breath comes with a frosty reminder of the chill.
In Marine on Saint Croix 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 Marine on Saint Croix, you can visit Hourly UV Index in Marine on Saint Croix.
UV Risk Categories
Weather in Marine on Saint Croix varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Marine on Saint Croix, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -9°C (16°F) | 25 mm (1.0 inches) | 87% | low |
| February Weather | -9°C (17°F) | 35 mm (1.4 inches) | 90% | moderate |
| March Weather | 0°C (33°F) | 53 mm (2.1 inches) | 85% | moderate |
| April Weather | 6°C (43°F) | 88 mm (3.5 inches) | 84% | high |
| May Weather | 15°C (59°F) | 127 mm (5.0 inches) | 78% | very high |
| June Weather | 21°C (71°F) | 95 mm (3.7 inches) | 80% | very high |
| July Weather | 23°C (74°F) | 101 mm (4.0 inches) | 81% | very high |
| August Weather | 21°C (70°F) | 123 mm (4.9 inches) | 81% | very high |
| September Weather | 17°C (64°F) | 107 mm (4.2 inches) | 81% | high |
| October Weather | 9°C (48°F) | 101 mm (4.0 inches) | 84% | moderate |
| November Weather | 0°C (33°F) | 39 mm (1.5 inches) | 88% | moderate |
| December Weather | -5°C (23°F) | 55 mm (2.2 inches) | 84% | low |