Last updated: March 2, 2024
The weather in Old Greenwich, United States, during December is characterized by an average temperature of 3°C (39°F). Highs can soar to 15°C (59°F), while lows may dip to -7°C (20°F). Typically, the humidity level in Old Greenwich throughout December hovers around 80%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In December, Old Greenwich averages 113 mm (4.5 inches) of rainfall, typically over the course of 11 rainy days. The month enjoys an average of 9 hours 16 minutes of daylight, with the sun shining for approximately 5 hours 36 minutes each day. Additionally, there is a 31% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In December, the UV Index in Old Greenwich reaches a maximum of 2, indicating a level of Low exposure. The most intense UV radiation typically occurs between 10:00 and 12:00, during which unprotected skin may burn in as little as 45 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 0 | 1 | 1 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 0 | 0 | 0 |
| Exposure | Low | ||||||||||||
| Time to burn | 45 min | ||||||||||||