Last updated: June 2, 2025
Understanding the UV Index is crucial for residents of Danville, United States, where the Cfa climate brings warm summers and significant sun exposure. Awareness of UV levels directly impacts your skin health; knowing when to seek shade or apply sunscreen can mean the difference between a fun day outdoors and painful sunburn. With peak UV Index readings reaching as high as 11 around midday, it’s essential to stay informed about daily UV risks to protect your skin and enjoy the sunny days safely.
The UV Index dramatically peaks during the midday hours, showcasing a clear pattern of solar intensity. Starting from a mild 1 at 07:00, it steadily rises, reaching a notable 11 by 13:00. This peak signifies a high risk for skin damage, urging sun safety precautions. As the afternoon progresses, the index gradually declines—falling to 9 at 15:00, and decreasing further to 2 by 18:00. With the sun's intensity waning, the cooler evening hours promise a gentle close to the day, offering a more comfortable outdoor experience. Always stay vigilant during peak UV times!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 3 | moderate | 30 min |
| 10:00 | 5 | moderate | 30 min |
| 11:00 | 8 | very high | 15 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 10 | very high | 15 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 pose varying risks for sun exposure. January and December maintain moderate UV levels (3), allowing for a burn time of 30 minutes, while February sees a slight increase to 5. March marks the onset of higher risks with a UV index of 7, categorized as high, and a reduced burn time of 25 minutes. The months of April and May reach an alarming UV index of 10, labeled as very high, where burn time drops to just 15 minutes. The peak of danger occurs during June and July, with an extreme UV index of 11, demanding caution with an even shorter burn time of 10 minutes. August and September continue to present significant risks, both at a UV index of 10 and 9, respectively. As the year winds down, October sees a decrease to a high level of 7, while November and December return to moderate levels. Visitors and residents should prioritize sun protection during the high-risk months of March through September, especially during the peak summer months of June and July, by wearing sunscreen, protective clothing, and seeking shade during peak hours to prevent skin damage.
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 |
| Danville | 3 | 5 | 7 | 10 | 10 | 11 | 11 | 10 | 9 | 7 | 5 | 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 |