Last updated: July 2, 2025
Awareness of the UV Index is crucial for residents of Johnson Siding, where typical conditions in a Dfa climate zone can lead to significant sun exposure. Understanding UV levels is key to preventing sunburn and maintaining overall skin health, especially during peak hours from 10 AM to 2 PM when the index reaches its highest values of 9 to 11. With a landscape that invites outdoor activities, knowing how to protect yourself from harmful UV radiation can make all the difference for your well-being. Stay informed and enjoy the sun safely!
The UV Index throughout the day exhibits a remarkable peak during the midday hours. Starting modestly at 1 by 7 AM, it gradually rises, reaching 4 by 9 AM. As the sun ascends, the intensity escalates sharply, hitting 7 at 10 AM and soaring to its highest point of 11 between 1 PM and 2 PM. This is a crucial time for sun protection, as the UV exposure is at its most intense. Fortunately, by late afternoon, relief comes as the index dips to 6 at 4 PM and plunges further to 1 by 7 PM, making those evening hours much safer for outdoor activities. Remember to safeguard your skin during those peak hours!
| 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 | 7 | high | 25 min |
| 11:00 | 9 | 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 | 8 | very high | 15 min |
| 16:00 | 6 | high | 25 min |
| 17:00 | 4 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index varies significantly, indicating changing levels of sun exposure risk. The highest risk months are June and July, both classified as having an extreme UV Index of 11, which corresponds to a burn time of just 10 minutes. The very high risk persists in April, May, August, and September, where visitors should be particularly cautious, with burn times ranging from 15 to 25 minutes. As UV levels drop in the fall and winter, January, February, and November present a moderate risk with burn times around 30 minutes, while December brings a low risk, allowing for a safer 45-minute burn time. It is essential for residents and visitors to take proactive sun safety measures, especially during the higher risk months, such as wearing sunscreen, hats, and protective clothing when spending extended time outdoors.
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 |
| Johnson Siding | 3 | 5 | 6 | 9 | 9 | 11 | 11 | 10 | 8 | 6 | 3 | 2 |
| 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 |