Last updated: June 2, 2025
Understanding the UV Index is crucial for the residents of Lewisville, Texas, particularly given its Cfa climate which features warm summers and mild winters. With sunny days prevalent, the UV levels can reach a maximum of 11 during midday hours, indicating a very high risk of harm from unprotected sun exposure. Awareness of these levels is vital for preventing sunburn and protecting overall skin health. Whether you're enjoying outdoor activities or simply soaking up the sun, knowing the UV Index empowers you to take the necessary precautions and enjoy the rays safely.
At 07:00, the UV Index starts at a mild 1, perfect for an early morning stroll. As the day unfolds, the intensity gradually climbs, reaching 2 by 08:00 and 3 by 09:00. The sun packs a punch at 10:00, soaring to a 6. By 11:00, it hits a significant 8, warning us to take precautions. The peak intensity arrives at 12:00, where the UV Index surges to a blistering 11. It maintains this level until 14:00, demanding attention and protection from the sun's rays. A gradual decline starts at 15:00, lowering to 9, followed by 6 at 16:00. As evening approaches, the numbers drop further to 4 at 17:00, a gentle reminder of the sun's retreat. Finally, by 18:00, it's down to 2, and by 19:00, we're back to a comfortable 1, marking the end of a sun-drenched day. ✨
| 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 | 6 | high | 25 min |
| 11:00 | 8 | very high | 15 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 11 | extreme | 10 min |
| 15:00 | 9 | 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 experiences significant fluctuations, with the highest values occurring from April to August, where levels reach 11 to 12 and are categorized as extreme. This indicates a burn time of only 10 minutes during these peak months. Visitors and residents should be particularly cautious during these high-risk months, as exposure can lead to serious skin damage. March and September also present elevated risks with indices of 8 and 10, respectively, categorized as very high. It's advisable for everyone to take protective measures, such as wearing sunscreen, hats, and protective clothing, especially during midday hours when UV radiation is most intense. In comparison, the months of January, December, and November see lower UV indices (ranging from 4 to 6), where the burn time increases to 25-30 minutes, though sun protection is still recommended.
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 |
| Lewisville | 4 | 7 | 8 | 11 | 11 | 12 | 11 | 11 | 10 | 8 | 6 | 4 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |