Last updated: May 3, 2025
Awareness of the UV Index is crucial for residents of Sheffield, United States, where the subtropical climate (Cfa) can lead to significant sun exposure. Understanding UV levels is essential because it helps prevent sunburn and protects skin health, especially during peak hours when readings can reach as high as 11. With typical UV spikes peaking around midday, taking precautions becomes vital to safeguard against harmful effects. Stay informed and proactive about UV exposure to ensure a healthier, sun-smart lifestyle in Sheffield!
As the sun rises, the UV Index makes its initial climb, starting at a mild 1 by 7:00 AM, perfect for early morning outings. By 9:00 AM, it reaches a cautious 4, signaling a need for light protection. The day really heats up at 11:00 AM, where it peaks at a striking 9, and it hits its maximum intensity of 11 at 1:00 PM. During these hours, sunscreen is a must if you plan to be outdoors! As afternoon approaches, the intensity begins to wane, with the index tapering back to 7 by 3:00 PM and dropping to a relaxed 1 by 6:00 PM, perfect for evening strolls. Remember, while UV rays are their strongest in the early afternoon, they remain a factor throughout the day—stay safe in the sun!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 4 | moderate | 30 min |
| 10:00 | 7 | high | 25 min |
| 11:00 | 9 | 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 | 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, the UV Index experiences significant seasonal fluctuations, with the highest levels occurring during the summer months. Notably, from May to August, the UV Index reaches extreme levels of 11, indicating a high risk for skin damage with a burn time of only 10 minutes. In contrast, the winter months, especially January and December, see moderate UV levels of 4, allowing for a safer exposure time of 30 minutes. The months of February and March also present heightened risks with UV indices of 6 and 8, respectively, highlighting the necessity for caution as spring approaches. Residents and visitors are advised to protect their skin during April to September when the UV values are particularly elevated. Measures such as wearing sunscreen, protective clothing, and seeking shade during peak sun hours are strongly recommended to reduce the risk of sunburn and long-term skin damage.
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 |
| Los Angeles UVI | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 10 | 10 | 7 | 5 | 4 |
| Sheffield | 4 | 6 | 8 | 10 | 11 | 11 | 11 | 10 | 9 | 7 | 5 | 4 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |