Last updated: June 2, 2025
Understanding the UV Index is crucial for residents and visitors in Stonington, United States, where the climate is characterized by cold to mild winters and warm summers. High UV exposure can lead to sunburn, skin damage, and long-term health issues, making it essential to monitor daily UV levels. Throughout the day, particularly between 10 AM and 4 PM, the UV Index can reach a maximum of 9—indicating a very high risk for harm from unprotected sun exposure. By staying informed about UV levels, you can take proactive steps to protect your skin and enjoy the beautiful Stonington outdoors safely.
The UV index paints a vivid picture of sun intensity throughout the day. Starting off gently at 1 by 7:00 AM, the sun's rays begin to strengthen, reaching 3 by 8:00 AM. The real rise occurs at 9:00 AM, where the index peaks at a robust 5, but it’s not until 10:00 AM that the day truly warms up, hitting 7. As the clock strikes 11:00 AM, the UV intensity reaches its zenith at 9, holding steady until 2:00 PM, making this the prime time for sun exposure. A slight decline begins after 3:00 PM, dipping to 5 by 4:00 PM, before winding down towards the evening. By 6:00 PM, the index drops back to a gentle 1, signaling the day's end under the sun's watchful gaze. Keep this UV index in mind as you plan your outdoor activities!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 5 | moderate | 30 min |
| 10:00 | 7 | high | 25 min |
| 11:00 | 9 | very high | 15 min |
| 12:00 | 9 | very high | 15 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 9 | very high | 15 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 5 | moderate | 30 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, UV exposure varies significantly, with the highest risk occurring during the summer months of May through August. During this period, the UV Index reaches a peak of 9, classified as very high, with a minimal burn time of just 15 minutes. Conversely, the UV Index is at its lowest in January and December at 2, indicating a low risk of harm from sun exposure, allowing for a burn time of 45 minutes. April and September mark transitional months where the UV Index is high at 7, prompting caution with a burn time of 25 minutes. To protect against harmful UV radiation, it is crucial for both visitors and residents to take appropriate precautions, particularly from May to August, such as wearing sunscreen, protective clothing, and seeking shade during peak sun hours.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Stonington | 2 | 4 | 5 | 7 | 9 | 9 | 9 | 8 | 7 | 5 | 3 | 2 |
| 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 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |