Last updated: June 24, 2025
In December, the average temperature in Rotterdam, United States hovers around -1°C (31°F). Expect a chilly range where minimum temperatures can drop to -22°C (-7°F), while the maximum could reach 17°C (63°F). Additionally, brace for 96 mm (3.8 in) of precipitation spread over 12 days, accompanied by a high average humidity of 84%. Stay warm and prepared!
In December in Rotterdam, the average temperature is -1°C (31°F), with maximums reaching 17°C (63°F) and minimums dropping as low as -22°C (-7°F). Travelers should be prepared for a wide temperature range, ensuring they pack accordingly for both chilly and milder conditions.
In Rotterdam in December, the precipitation amount is 96 mm (3.8 in) spread over a duration of 12 days.
In Rotterdam in December humidity is 84%. With an average temperature of -1°C (31°F), this humidity feels like a biting chill that seeps through layers of clothing, making outdoor excursions brisk and invigorating, yet challenging for those unaccustomed to such damp conditions.
In Rotterdam 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 Rotterdam, you can visit Hourly UV Index in Rotterdam.
UV Risk Categories
Weather in Rotterdam varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Rotterdam, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (26°F) | 73 mm (2.9 inches) | 89% | moderate |
| February Weather | -2°C (29°F) | 92 mm (3.6 inches) | 88% | moderate |
| March Weather | 2°C (35°F) | 81 mm (3.2 inches) | 86% | high |
| April Weather | 8°C (47°F) | 131 mm (5.2 inches) | 84% | very high |
| May Weather | 15°C (59°F) | 106 mm (4.2 inches) | 76% | very high |
| June Weather | 20°C (68°F) | 117 mm (4.6 inches) | 72% | very high |
| July Weather | 23°C (73°F) | 152 mm (6.0 inches) | 66% | very high |
| August Weather | 22°C (71°F) | 125 mm (4.9 inches) | 64% | very high |
| September Weather | 18°C (64°F) | 109 mm (4.3 inches) | 72% | high |
| October Weather | 12°C (53°F) | 148 mm (5.8 inches) | 81% | high |
| November Weather | 4°C (39°F) | 96 mm (3.8 inches) | 87% | moderate |
| December Weather | -1°C (31°F) | 96 mm (3.8 inches) | 84% | low |