Last updated: March 2, 2024
The weather in Happy Valley, United States, during December is characterized by an average temperature of -1°C (31°F). Highs can soar to 6°C (44°F), while lows may dip to -9°C (15°F). Typically, the humidity level in Happy Valley throughout December hovers around 92%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In December, Happy Valley averages 155 mm (6.1 inches) of rainfall, typically over the course of 19 rainy days. The month enjoys an average of 6 hours 0 minutes of daylight, with the sun shining for approximately 1 hours 10 minutes each day. Additionally, there is a 25% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In December, the UV Index in Happy Valley reaches a maximum of 1, 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 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
| Exposure | Low | ||||||||||||
| Time to burn | 45 min | ||||||||||||