Last updated: June 2, 2025
In Rosières-près-Troyes, awareness of the UV Index is crucial for maintaining skin health and preventing sunburn, particularly during the sunnier months. Understanding daily UV levels helps residents and visitors make informed decisions about sun protection, especially when exposure can reach a peak index of 9 around midday. This region, characterized by a Cfb climate—or a temperate oceanic climate—experiences varying UV risks throughout the day, necessitating vigilance when planning outdoor activities. Stay informed to enjoy the beautiful outdoors safely!
During the early hours, the UV Index remains low, peaking at 1 from 07:00 to 08:00. As the sun climbs higher, the index begins to rise sharply, reaching 3 by 09:00 and hitting 4 at 10:00. The intensity escalates significantly around 11:00, soaring to 6, and continues to climb, peaking at a strong 9 from 13:00 to 14:00. The intensity slightly tapers off after that, dropping to 8 at 15:00 and then gradually decreasing through the late afternoon and evening, landing at 2 by 19:00. It's crucial to stay protected during the midday hours when UV radiation is at its highest, especially between 12:00 and 14:00.
| 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 | 4 | moderate | 30 min |
| 11:00 | 6 | high | 25 min |
| 12:00 | 8 | very high | 15 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 9 | very high | 15 min |
| 15:00 | 8 | very high | 15 min |
| 16:00 | 6 | high | 25 min |
| 17:00 | 4 | moderate | 30 min |
| 18:00 | 3 | moderate | 30 min |
| 19:00 | 2 | low | 45 min |
Throughout the year, the UV Index demonstrates notable seasonal variations that affect exposure risk. January and February have relatively low to moderate UV levels (Index 2-3), with safe burn times of 45 and 30 minutes respectively. As spring approaches, March sees a rise to an index of 5, and by April, it reaches 6, marking the beginning of high-risk months. The most critical period arrives in May and June, where the UV Index peaks at 8-9, indicating very high exposure risk and a reduced burn time of just 15 minutes. July and August maintain this peak, before tapering off in September with a return to a high risk (UV Index 6). October brings a moderate reduction (Index 4), while winter months November and December drop back to low levels. Visitors and residents should be particularly vigilant during May through September, using sunscreen and protective clothing to minimize harmful effects during these high-risk months.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Paris UVI | 2 | 3 | 5 | 6 | 8 | 9 | 8 | 8 | 6 | 4 | 2 | 1 |
| Rosieres-pres-Troyes | 2 | 3 | 5 | 6 | 8 | 9 | 9 | 8 | 6 | 4 | 2 | 1 |
| Lyon UVI | 2 | 3 | 5 | 6 | 8 | 10 | 9 | 8 | 6 | 5 | 3 | 2 |
| Nice UVI | 2 | 4 | 6 | 7 | 8 | 10 | 9 | 8 | 7 | 5 | 3 | 2 |
| Marseille UVI | 2 | 4 | 5 | 7 | 9 | 10 | 9 | 8 | 7 | 5 | 3 | 2 |
| Toulouse UVI | 2 | 4 | 6 | 7 | 9 | 10 | 10 | 9 | 7 | 5 | 3 | 2 |