Last updated: June 24, 2025
In December, the average temperature in West Lafayette, United States hovers around 2°C (37°F). Expect minimums to dip as low as -15°C (5°F) and highs reaching up to 18°C (65°F). With an average precipitation of 101 mm (4.0 in) spread over 12 days, and a humidity level of 86%, it's a month that calls for both warm layers and a trusty umbrella.
In December in West Lafayette, the average temperature is 2°C (37°F), with maximums reaching 18°C (65°F) and minimums dipping as low as -15°C (5°F). This wide range of temperatures suggests that travelers should be prepared for both mild days and cold nights while visiting.
In West Lafayette in December, the precipitation amount is 101 mm (4.0 in) spread over 12 days.
In West Lafayette in December, humidity is 86%. With an average temperature of 2°C (37°F), this humidity feels like a chilly dampness that clings to your clothes and makes outdoor activities quite uncomfortable for traveling.
In West Lafayette 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 West Lafayette, you can visit Hourly UV Index in West Lafayette.
UV Risk Categories
Weather in West Lafayette varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in West Lafayette, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (31°F) | 92 mm (3.6 inches) | 88% | moderate |
| February Weather | 1°C (35°F) | 113 mm (4.5 inches) | 88% | moderate |
| March Weather | 6°C (42°F) | 109 mm (4.3 inches) | 87% | high |
| April Weather | 11°C (52°F) | 129 mm (5.1 inches) | 87% | very high |
| May Weather | 17°C (63°F) | 131 mm (5.1 inches) | 81% | very high |
| June Weather | 22°C (71°F) | 141 mm (5.5 inches) | 83% | very high |
| July Weather | 24°C (76°F) | 114 mm (4.5 inches) | 82% | very high |
| August Weather | 23°C (73°F) | 93 mm (3.6 inches) | 76% | very high |
| September Weather | 20°C (69°F) | 107 mm (4.2 inches) | 77% | very high |
| October Weather | 14°C (58°F) | 107 mm (4.2 inches) | 82% | high |
| November Weather | 6°C (42°F) | 99 mm (3.9 inches) | 89% | moderate |
| December Weather | 2°C (37°F) | 101 mm (4.0 inches) | 86% | low |