Last updated: August 1, 2025
Understanding the UV Index is crucial for residents of Greensburg, United States, where the climate often presents significant sun exposure risks. With a typical humid subtropical climate (Cfa), the sun's rays can reach dangerously high levels, especially between 10 AM and 4 PM, peaking at an impressive UV Index of 11 at noon. Awareness of these UV levels is vital for effective sunburn prevention and overall skin health, helping you to protect yourself from harmful ultraviolet radiation that can lead to skin damage and increase the risk of skin cancer. Stay informed and safeguard your skin by checking the UV Index regularly!
The UV Index today paints a vivid picture of the sun's intensity as it rises to its peak around midday. Starting off gently at 1 by 07:00 and 08:00, the sun begins to assert itself, climbing to 3 by 09:00. As the clock strikes 10:00, the UV index soars to 5, and by 11:00, it surges to 7. The real heat hits around noon, with 12:00 witnessing a striking 9 before peaking at 11 from 13:00 to 14:00—ideal conditions for sunbathers and outdoor enthusiasts. However, as the day progresses, the UV levels start to dip; by 15:00, it settles at 10, then recedes to 8 by 16:00. Finally, as evening approaches, the index drops to 5 at 17:00, 3 at 18:00, and returns to a mild 1 by 19:00. It’s a day to embrace the sun early, but don’t forget the sunscreen as the UV rays reach their zenith!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 2 | low | 45 min |
| 10:00 | 4 | 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 | 9 | very high | 15 min |
| 16:00 | 7 | high | 25 min |
| 17:00 | 5 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, seasonal UV changes reflect significant fluctuations in UV Index levels, impacting outdoor activities. The high-risk months for UV exposure are April to August, where the index peaks at 11, indicating extreme exposure with a burn time as short as 10 minutes. Residents and visitors should take precautions during these months by wearing protective clothing, applying sunscreen regularly, and seeking shade during peak sunlight hours. In contrast, exposure levels are more moderate in the winter months, with January and February presenting a UV Index of 4 to 5 and a burn time of 30 minutes. It is crucial to remain vigilant even in the moderate range, as harmful UV rays can still cause 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 |
| Greensburg | 4 | 5 | 7 | 10 | 11 | 11 | 11 | 10 | 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 |