Last updated: May 3, 2025
Understanding the UV Index is essential for residents and visitors of Callac, France, particularly given its temperate Cfb climate that often brings bright sunny days. Being aware of UV levels helps in preventing sunburn and safeguarding skin health, which is crucial as even moderate exposure can lead to long-term damage. During peak hours, such as from 12 PM to 2 PM, the UV Index reaches levels of 6 to 8, indicating a heightened risk for harm from unprotected sun exposure. By staying informed and taking appropriate precautions, you can enjoy the beautiful weather Callac has to offer while keeping your skin safe!
As the sun rises, the UV Index starts at a gentle 1 at 7:00 AM and holds steady until 9:00 AM, indicating a low-risk environment for sun exposure. By 10:00 AM, the intensity begins to ramp up, reaching 3, and the heat is on! At 11:00 AM, the UV Index climbs to 5, signaling the need for sun protection. The peak arrives at 2:00 PM with a scorching 8, when precautions become crucial. As the afternoon progresses, we see a gradual decline, with values slipping back to 7 at 3:00 PM and tapering to 5 by 5:00 PM. Evening approaches, and the UV levels wind down to a more manageable 3 by 6:00 PM, finally settling at 2 as the sun begins to set at 7:00 PM. Stay protected during those peak hours!
| 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 | 3 | moderate | 30 min |
| 11:00 | 5 | moderate | 30 min |
| 12:00 | 6 | high | 25 min |
| 13:00 | 7 | high | 25 min |
| 14:00 | 8 | very high | 15 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 6 | high | 25 min |
| 17:00 | 5 | moderate | 30 min |
| 18:00 | 3 | moderate | 30 min |
| 19:00 | 2 | low | 45 min |
Throughout the year, UV radiation levels fluctuate significantly, with distinct high-risk months emerging in the summer. From May to August, the UV Index is categorized as very high (ranging from 8 to 9), indicating that visitors and residents should exercise heightened caution, as the burn time decreases to just 15 minutes. April sees a transition to a high exposure category, while March starts in a moderate range. Conversely, the winter months, including January, November, and December, have a low UV Index (2), granting longer burn times of 45 minutes. To safeguard against skin damage, it's imperative for everyone to wear protective clothing, seek shade, and apply sunscreen during peak UV times, especially from late spring to the end of summer.
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 |
| Callac | 2 | 3 | 5 | 6 | 8 | 9 | 9 | 8 | 6 | 5 | 2 | 2 |
| 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 |