Last updated: June 24, 2025
In December, the average temperature in Ithaca, United States hovers around -1°C (31°F). Expect chilly nights with minimums dropping to -22°C (-7°F), while daytime highs can reach up to 16°C (62°F). This month also brings a touch of moisture, with 62 mm (2.4 in) of precipitation spread over 9 days. Additionally, average humidity levels sit at a brisk 86%, making for a notably crisp atmosphere.
In December in Ithaca, the average temperature is -1°C (31°F), with maximums reaching 16°C (62°F) and minimums dipping as low as -22°C (-7°F). This wide range of temperatures means travelers should prepare for both mild and extremely cold weather.
In Ithaca in December, the precipitation amount is 62 mm (2.4 in) over the course of 9 days.
In Ithaca in December humidity is 86%. With an average temperature of -1°C (31°F), this humidity feels like an eerie chill enveloping you, making travel uncomfortable as the damp air bites into your skin and the cold seeps through even the warmest of clothes, creating an atmosphere that is heavy and uninviting.
In Ithaca 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 Ithaca, you can visit Hourly UV Index in Ithaca.
UV Risk Categories
Weather in Ithaca varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Ithaca, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (25°F) | 59 mm (2.3 inches) | 88% | low |
| February Weather | -3°C (26°F) | 63 mm (2.5 inches) | 87% | moderate |
| March Weather | 2°C (36°F) | 60 mm (2.4 inches) | 85% | moderate |
| April Weather | 8°C (46°F) | 87 mm (3.4 inches) | 86% | very high |
| May Weather | 15°C (59°F) | 116 mm (4.6 inches) | 80% | very high |
| June Weather | 21°C (69°F) | 120 mm (4.7 inches) | 80% | very high |
| July Weather | 23°C (75°F) | 63 mm (2.5 inches) | 80% | very high |
| August Weather | 22°C (72°F) | 71 mm (2.8 inches) | 80% | very high |
| September Weather | 18°C (65°F) | 104 mm (4.1 inches) | 80% | high |
| October Weather | 11°C (53°F) | 114 mm (4.5 inches) | 84% | moderate |
| November Weather | 3°C (38°F) | 59 mm (2.3 inches) | 89% | moderate |
| December Weather | -1°C (31°F) | 62 mm (2.4 inches) | 86% | low |