Last updated: June 2, 2025
In Johnson City, understanding the UV Index is crucial for protecting your skin and overall health. The UV Index measures the strength of ultraviolet radiation from the sun, which can lead to sunburn and increase the risk of skin cancer if precautions are not taken. With Johnson City’s Cfb climate, residents often experience significant UV exposure, especially around midday when levels can soar to as high as 11. By staying informed about daily UV levels, you can enjoy sunny days while minimizing the risk of harmful effects, ensuring your skin stays healthy and vibrant.
The UV Index throughout the day reveals a fascinating journey of sun exposure. Starting at a gentle level of 1 at 07:00 and 08:00, the index begins to rise steadily, hitting 3 by 09:00. As the sun reaches its peak, the intensity escalates dramatically, soaring to 10 at noon and peaking at 11 from 13:00 to 14:00—ideal for sun protection measures! The afternoon sees a gradual decline, with values dropping to 9 at 15:00, then further diminishing to 2 by 18:00, and finally settling back at 1 by 19:00. Whether lounging in the sun or engaging in outdoor activities, awareness of this UV landscape is essential for safe enjoyment!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | 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 | 11 | extreme | 10 min |
| 15:00 | 9 | very high | 15 min |
| 16:00 | 7 | high | 25 min |
| 17:00 | 5 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
The UV Index experiences a significant increase from winter to summer, peaking during the high-risk months of May, June, and July, where it reaches an extreme level of 11 and a burn time of just 10 minutes. As we transition into spring, March and April also show very high levels (UV Index 8 and 10, respectively), resulting in a burn time of 15 minutes. Visitors and residents should be particularly cautious during these months, seeking shade, wearing protective clothing, and applying sunscreen frequently, as exposure can lead to skin damage in a matter of minutes. From August to October, the index gradually decreases; however, September and October still present high risks (UV Index 10 and 8) with a burn time of 15 minutes. As winter arrives, UV levels dip to moderate, and the burn times increase to 30 minutes in November and December, suggesting a lower risk of UV exposure. Always prioritize sun safety, especially in the warmer months.
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 |
| Johnson City | 4 | 6 | 8 | 10 | 11 | 11 | 11 | 10 | 10 | 8 | 5 | 3 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |