Last updated: June 2, 2025
Understanding the UV Index is crucial for residents and visitors in Geyserville, United States. With its Csb climate characterized by mild, wet winters and warm, dry summers, the region occasionally faces significant UV exposure, particularly during peak hours. Being aware of UV levels not only helps in preventing painful sunburns but also plays a vital role in maintaining long-term skin health. The UV Index peaks at 11 between noon and 2 PM, indicating a very high risk of harm from unprotected sun exposure. Stay informed and take necessary precautions to enjoy the beautiful California sun safely!
At dawn, the UV Index starts off gentle, peaking at 1 by 7:00 AM. As the sun climbs higher, the index rises steadily, hitting 2 by 8:00 AM, then surging to 4 at 9:00 AM. The intensity escalates, reaching a robust 6 by 10:00 AM, and striking its peak at 10 by noon. The highest values occur between 1:00 PM and 2:00 PM, where it boldly stands at 11. As the afternoon progresses, the index begins to wane, falling to 9 at 3:00 PM, then dropping further to 7 by 4:00 PM. By 5:00 PM, the UV Index returns to a more manageable 4, before tapering off to 2 at 6:00 PM and concluding at 1 by 7:00 PM. It's essential to stay protected during those peak hours for safe sun exposure!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 4 | moderate | 30 min |
| 10:00 | 6 | high | 25 min |
| 11:00 | 8 | very high | 15 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 11 | extreme | 10 min |
| 15:00 | 9 | very high | 15 min |
| 16:00 | 7 | high | 25 min |
| 17:00 | 4 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
As the seasons change, so do the UV Index levels, which peak during the summer months. January and December see a moderate UV Index of 3, allowing for longer burn times of 30 minutes, while February holds steady at 5. The risk begins to rise in March with a high UV Index of 7 and a reduced burn time of 25 minutes. From April through July, the UV Index escalates to very high and extreme levels peaking at 11, resulting in very short burn times of just 10 minutes. August and September maintain a very high Index of 10 and 9, respectively, with burn times of 15 minutes. October decreases to a high level of 7, while risk subsides again in November and December. Visitors and residents are advised to take necessary precautions, especially during the high-risk months of April to September, by wearing protective clothing, applying sunscreen, and avoiding sun exposure during peak hours.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chicago UVI | 3 | 4 | 6 | 8 | 9 | 10 | 10 | 9 | 8 | 6 | 4 | 2 |
| Brooklyn UVI | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
| New York City UVI | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
| Geyserville | 3 | 5 | 7 | 8 | 11 | 11 | 11 | 10 | 9 | 7 | 4 | 3 |
| Los Angeles UVI | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 10 | 10 | 7 | 5 | 4 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |