Last updated: August 1, 2025
Understanding the UV Index is crucial for residents of Yorktown, United States, as it serves as a daily reminder of the sun's intensity and helps guide safe exposure levels. With peaks reaching 11 during mid-day hours, being aware of UV levels is essential for preventing sunburn and protecting skin health. Given Yorktown's Cfa climate, characterized by warm summers, residents must remain vigilant about their sun safety, especially when UV exposure risks are elevated. Whether you're heading outdoors for work or leisure, keeping an eye on the UV Index can safeguard your skin and enhance your time in the sun.
The UV Index throughout the day follows a predictable rise and fall, peaking at 11 around 1:00 PM. Starting at a modest 1 at 7:00 AM, it gradually escalates, reaching 10 by 12:00 PM, signaling the need for sun protection. As the afternoon progresses, the index dips from 11 to 8 by 3:00 PM, then declines further to 2 by 6:00 PM, and finally settles back at 1 by 7:00 PM. This data underscores the importance of taking precautions during the hours of peak UV exposure, particularly between 11:00 AM and 3:00 PM, when levels are highest and pose the greatest risk to skin health.
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 | 7 | high | 25 min |
12:00 | 9 | very high | 15 min |
13:00 | 10 | very high | 15 min |
14:00 | 9 | very high | 15 min |
15:00 | 8 | very high | 15 min |
16:00 | 5 | moderate | 30 min |
17:00 | 3 | moderate | 30 min |
18:00 | 2 | low | 45 min |
19:00 | 1 | low | 45 min |
Throughout the year, UV exposure varies significantly, with the highest risks occurring from April to September. During this period, the UV Index peaks, reaching 11 in July, categorized as extreme, and indicating a burn time of just 10 minutes. Residents and visitors should be particularly vigilant from February to October, as these months see high to very high UV levels, with April to August presenting the most risk. To protect against harmful UV radiation, it is advisable to wear sunscreen, protective clothing, and sunglasses, and to seek shade during peak sun hours, especially from late morning to early afternoon. Conversely, the winter months of December and January see moderate UV levels, allowing for more extended outdoor exposure with a burn time of 30 minutes.
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 |
Yorktown | 3 | 6 | 7 | 9 | 10 | 10 | 11 | 10 | 8 | 8 | 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 |