Last updated: June 2, 2025
Understanding the UV Index is crucial for residents and visitors in Jasenna, Czech Republic, where the unique Cfb climate brings a mix of cool summers and mild winters. As UV levels can fluctuate significantly throughout the day — peaking at a high of 8 around noon — awareness of these levels is essential for effective sunburn prevention and maintaining skin health. By knowing when UV exposure is at its highest, individuals can enjoy the beautiful outdoors while protecting themselves from harmful effects. With regular monitoring, you'll be better equipped to navigate the risks associated with Jasenna's sunshine.
As the sun rises, the UV Index begins its steady climb, starting from a gentle 1 at 7:00 AM. By 10:00 AM, it reaches 5, signaling an increase in UV exposure. The peak occurs at 12:00 PM, hitting a robust 8, where caution is advised, especially for outdoor activities. The intensity remains high at 8 from 1:00 PM to 2:00 PM, encouraging sun protection measures. As the afternoon progresses, the index gradually declines to 6 at 3:00 PM, then further to 3 by 5:00 PM. Finally, as the day winds down, the UV Index settles at 1 by 7:00 PM, reflecting a much safer environment for evening activities. Enjoy the sun, but remember to protect your skin during those peak hours!
| 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 | 5 | moderate | 30 min |
| 11:00 | 7 | high | 25 min |
| 12:00 | 8 | very high | 15 min |
| 13:00 | 8 | very high | 15 min |
| 14:00 | 8 | very high | 15 min |
| 15:00 | 6 | high | 25 min |
| 16:00 | 5 | moderate | 30 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, UV levels experience significant fluctuations, with high-risk months identified as April through August, during which the UV Index can reach as high as 8 and fall within the very high exposure category. Specifically, June and July are the peak months for UV exposure, requiring extra caution as the burn time shortens to just 15 minutes. In contrast, January, November, and December present the lowest UV indices, categorized as low exposure, allowing for safer outdoor activities with extended burn times of 45 minutes. To ensure safety, visitors and residents should remain vigilant in high-risk months, applying sunscreen, wearing protective clothing, and seeking shade during peak hours, while enjoying the more forgiving UV levels during the winter months.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jasenna | 2 | 3 | 4 | 6 | 7 | 8 | 8 | 7 | 6 | 4 | 2 | 1 |
| Prague UVI | 2 | 3 | 4 | 5 | 7 | 8 | 8 | 7 | 6 | 4 | 2 | 1 |
| Ostrava UVI | 2 | 2 | 4 | 6 | 7 | 8 | 8 | 7 | 6 | 4 | 2 | 1 |
| Olomouc UVI | 2 | 3 | 4 | 6 | 7 | 8 | 8 | 7 | 6 | 4 | 2 | 2 |
| Pilsen UVI | 2 | 3 | 5 | 6 | 8 | 8 | 8 | 7 | 6 | 4 | 2 | 1 |
| Brno UVI | 2 | 3 | 5 | 6 | 8 | 8 | 8 | 7 | 6 | 4 | 2 | 2 |