Last updated: August 1, 2025
In Chatham, United States, understanding the UV Index is crucial for maintaining skin health and preventing sunburn. As residents bask in the warmth of a Cfa climate, where sunny days are common, awareness of UV levels ensures that outdoor activities are both enjoyable and safe. During peak hours, the UV Index can reach a maximum of 10, indicating a very high risk of harm from unprotected sun exposure. By keeping a close eye on the UV Index, residents can take proactive steps to protect themselves and their loved ones, ensuring a healthier lifestyle under the sun.
As the sun rises, the UV Index begins its gentle ascent, starting at 1 at 07:00. By 09:00, it climbs to 3, hinting at the day's potential for sun exposure. The heat peaks around 12:00, reaching a blistering 9, and hits its maximum at 13:00 and 14:00, both at a high of 10—a critical time for sun safety. As the afternoon transitions to evening, the UV Index gradually dips; by 18:00, it's down to 2, and as twilight approaches, it settles back at 1 by 19:00. Plan your outdoor activities wisely to stay safe in the sun!
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 | 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 experiences significant seasonal changes, with the highest levels occurring from March to October. The high-risk months are typically March, April, May, June, July, August, September, and October, when the index reaches very high to extreme levels. Specifically, June presents the greatest risk with a UV Index of 11, indicating extreme exposure and a burn time of only 10 minutes. During these months, it is crucial for both visitors and residents to take proper precautions, including wearing sunscreen, protective clothing, and sunglasses, and seeking shade during peak hours (10 a.m. to 4 p.m.). In contrast, the months of January, February, November, and December have a moderate exposure category, allowing for longer burn times of 30 minutes. Awareness of these fluctuations can help everyone enjoy outdoor activities safely.
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 |
Chatham | 3 | 6 | 8 | 9 | 10 | 11 | 10 | 10 | 9 | 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 |