Last updated: May 3, 2025
Understanding the UV Index is crucial for residents of Winchester, United States, where the climate tends toward dry and sunny conditions. As UV levels can soar as high as 11 during midday hours, being aware of these values can help prevent sunburn and protect your skin health. With Winchester's position in the BWk climate zone, residents should be particularly vigilant about daily UV exposure risks, especially between 10 a.m. and 2 p.m. when the sun's rays are the strongest. Stay informed and enjoy the outdoors safely!
The UV Index throughout the day presents a dynamic profile, peaking at 11 between 12:00 PM and 1:00 PM, indicating a high risk of harm from unprotected sun exposure. Morning hours start off mild, with values of 1 at 7:00 AM, gradually climbing to 5 by 9:00 AM. As the sun rises higher, the index hits 10 at 11:00 AM, before maxing out at 11. The afternoon sees a slight decline, dipping to 9 at 2:00 PM and continuing to fall, settling at 3 by 5:00 PM. As the day winds down, UV levels drop, returning to 1 by 6:00 PM, reminding us to seek shade and stay protected during those peak midday hours. 🌞
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 5 | moderate | 30 min |
| 10:00 | 7 | high | 25 min |
| 11:00 | 10 | very high | 15 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 9 | very high | 15 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 5 | moderate | 30 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
The UV Index experiences significant seasonal changes, peaking during the summer months. From January to February, UV exposure rises moderately, but by March and April, it escalates to very high levels, indicating increasing risk. The high-risk months are clearly May, June, July, and August, when the UV Index reaches extreme levels of 11 to 13, resulting in a rapid burn time of just 10 minutes. As summer transitions to fall, the UV Index gradually decreases, becoming moderate by November and December. Visitors and residents are advised to take extra precautions during high-risk months by wearing sunscreen, protective clothing, and limiting sun exposure during peak hours to mitigate the harmful effects of intense UV radiation.
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 |
| Los Angeles UVI | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 10 | 10 | 7 | 5 | 4 |
| Winchester | 4 | 6 | 8 | 10 | 11 | 12 | 13 | 11 | 10 | 7 | 5 | 3 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |