Last updated: June 2, 2025
Understanding the UV Index is crucial for residents of Randolph, United States, where sunny days are common and UV exposure can reach higher levels, especially during midday. Awareness of UV levels not only helps prevent painful sunburns but also protects long-term skin health, reducing the risk of skin cancers and premature aging. Given Randolph's Dfa climate, which features warm summers, it is vital to stay informed about daily UV forecasts to minimize risks associated with increased sun exposure. Enjoy the outdoors responsibly by tracking the UV Index!
As the day unfolds, the UV Index rises sharply, revealing the sun's intensity. At 7:00 AM, it starts low at 1, signaling a gentle morning. But by 10:00 AM, it surges to 5, urging early outdoor enthusiasts to apply sunscreen. The peak arrives at 1:00 PM with a blistering 11, indicating a strong need for protection. Following this zenith, the index gradually decreases, settling at 4 by 5:00 PM and then retreating to 1 as the sun sets at 7:00 PM. Throughout the day, it's clear: midday is when the sun is both brilliant and fierce, demanding our careful attention.
| 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 | 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 | 10 | very high | 15 min |
| 15:00 | 9 | very high | 15 min |
| 16:00 | 7 | high | 25 min |
| 17:00 | 4 | moderate | 30 min |
| 18:00 | 3 | moderate | 30 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, UV Index levels fluctuate significantly, reflecting seasonal changes in sun exposure. The high-risk months for UV exposure are April through September, with the highest point occurring in June, where the UV Index reaches an extreme level of 11 and the burn time shortens to just 10 minutes. To protect against harmful effects, visitors and residents should take precautions during these months, particularly in high-index periods; seek shade, wear protective clothing, and apply sunscreen with a high SPF during peak hours. In contrast, the UV Index drops to a moderate level in January, February, and November, allowing for a safer outdoor experience, while December and January present lower risks with burn times of 45 minutes. Remaining aware of UV levels can help ensure safe outdoor activities year-round.
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 |
| Randolph | 3 | 5 | 6 | 8 | 9 | 11 | 10 | 10 | 8 | 6 | 3 | 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 |