Last updated: March 2, 2024
The weather in Portland, United States, during December is characterized by an average temperature of -8°C (18°F). Highs can soar to 7°C (45°F), while lows may dip to -28°C (-18°F). Typically, the humidity level in Portland throughout December hovers around 86%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In December, Portland averages 39 mm (1.5 inches) of rainfall, typically over the course of 8 rainy days. The month enjoys an average of 8 hours 29 minutes of daylight, with the sun shining for approximately 5 hours 18 minutes each day. Additionally, there is a 34% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In December, the UV Index in Portland reaches a maximum of 2, indicating a level of Low exposure. The most intense UV radiation typically occurs between 11:00 and 13:00, 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 | 1 | 2 | 2 | 2 | 1 | 1 | 1 | 0 | 0 | 0 |
| Exposure | Low | ||||||||||||
| Time to burn | 45 min | ||||||||||||