Last updated: March 2, 2024
The weather in Keystone, United States, during May is characterized by an average temperature of 16°C (62°F). Highs can soar to 32°C (90°F), while lows may dip to 3°C (37°F). Typically, the humidity level in Keystone throughout May hovers around 78%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In May, Keystone averages 162 mm (6.4 inches) of rainfall, typically over the course of 16 rainy days. The month enjoys an average of 14 hours 34 minutes of daylight, with the sun shining for approximately 8 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 May, the UV Index in Keystone reaches a maximum of 9, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 15 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 | 1 | 2 | 3 | 5 | 7 | 9 | 9 | 9 | 7 | 5 | 3 | 2 | 1 |
| Exposure | Low | Moderate | High | VeryHigh | High | Moderate | Low | ||||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 25 min | 30 min | 45 min | ||||||