Last updated: June 2, 2025
Understanding the UV Index in Deerfield, United States is essential for protecting your skin and overall health. With the city’s BSk climate, which features warm summers and cold winters, UV radiation levels can vary significantly throughout the year. By being aware of the UV levels, especially during peak hours when the index can reach up to 12, residents can take proactive measures to prevent sunburn and long-term skin damage. Emphasizing the importance of sun safety in Deerfield will not only help you enjoy the outdoors but also safeguard your skin from harmful ultraviolet rays.
The UV Index today showcases a dramatic rise in intensity as the day progresses. Starting off at a mild 1 at 07:00 and 08:00, conditions remain safe for outdoor activities. However, as the clock strikes 10:00, the index escalates to a moderate 5, signaling the need for some sun protection. By 12:00, the UV Index peaks at an impressive 10—a strong rating that calls for serious caution. The day reaches its maximum intensity at 13:00 with a staggering 11, and then gradually tapers down to 12 at 14:00. As the afternoon rolls into evening, levels drop to 10 by 15:00, 8 at 16:00, and continue to decline to 3 by 18:00, before finishing the day at a restful 2 by 19:00. To enjoy the day safely, be sure to stay protected during the peak hours!
| 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 | 12 | extreme | 10 min |
| 15:00 | 10 | very high | 15 min |
| 16:00 | 8 | very high | 15 min |
| 17:00 | 6 | high | 25 min |
| 18:00 | 3 | moderate | 30 min |
| 19:00 | 2 | low | 45 min |
Throughout the year, the UV Index experiences significant fluctuations, impacting sun safety for both visitors and residents. From January to February, the UV Index remains moderate (4-5), with a burn time of 30 minutes. As spring approaches, March marks a transition to a high UV Index of 7, and by April, it escalates to 10, signaling the start of very high risk months. The peak UV exposure occurs in May and June, reaching an extreme 11-12, where one can burn in just 10 minutes. July continues this pattern, but a slight decline begins in August (UV Index 11). By September, the UV Index drops to 9, still indicating very high risk, before settling back to high levels in October (UV Index 7). During the late fall and winter months, the index decreases to moderate levels again. Visitors and residents are strongly advised to take precautions, especially from April to August, ensuring proper sun protection such as wearing sunscreen, protective clothing, and seeking shade during peak hours to minimize the risk of UV-related harm.
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 |
| Deerfield | 4 | 5 | 7 | 10 | 11 | 12 | 12 | 11 | 9 | 7 | 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 |