Last updated: May 3, 2025
Understanding the UV Index is crucial for residents of Renwick, New Zealand, where outdoor activities are abundant amidst its moderate Cfb climate. Awareness of UV levels can significantly help in preventing sunburn and protecting skin health, particularly during peak hours when the index rises to 4 around midday. With Renwick's typical exposure to UV radiation, grasping the fluctuations in these levels throughout the day is essential for everyone to enjoy the sun safely, ensuring that your time outdoors remains both enjoyable and healthy.
The UV Index for the day unfolds a fascinating journey through the hours, starting with a maximum of 0 at 7:00 AM, indicating a safe start to the morning. As the sun ascends, the index gradually climbs to 1 by 8:00 AM and 9:00 AM, hinting at a gentle rise in UV exposure. By 10:00 AM, the UV Index reaches 2, marking the beginning of a moderate risk period. The intensity peaks at 12:00 PM with a high of 4, prompting sun safety measures to avoid overexposure. As the afternoon progresses, the index recedes slightly, stabilizing at 3 from 11:00 AM to 14:00 PM, before tapering off to 1 by 16:00 PM, and finally returning to 0 by the evening. This daily UV cycle highlights the importance of sun safety, especially during midday hours when UV radiation is strongest.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 0 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 1 | low | 45 min |
| 10:00 | 2 | low | 45 min |
| 11:00 | 3 | moderate | 30 min |
| 12:00 | 4 | moderate | 30 min |
| 13:00 | 3 | moderate | 30 min |
| 14:00 | 3 | moderate | 30 min |
| 15:00 | 2 | low | 45 min |
| 16:00 | 1 | low | 45 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 0 | low | 45 min |
| 19:00 | 0 | low | 45 min |
Throughout the year, the UV Index experiences significant fluctuations, with the highest risk occurring in the winter and late fall months of January, February, November, and December, where it reaches a critical level of 13, categorized as extreme, with a burn time of only 10 minutes. As spring approaches, March and October see a drop to a very high level of 9, while April and September present a high risk with indices of 7 and 6, respectively, allowing for longer burn times of 25 minutes. May and August show moderate levels at 4, offering burn times of 30 minutes, whereas the summer months of June and July maintain a low risk at 2, with extended burn times of 45 minutes. It is essential for both visitors and residents to take precautions, especially during the high-risk months from January to February and November to December, by using sunscreen, wearing protective clothing, and seeking shade to minimize UV exposure.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Christchurch UVI | 13 | 12 | 9 | 6 | 3 | 2 | 2 | 3 | 5 | 9 | 10 | 12 |
| Wellington UVI | 13 | 13 | 9 | 7 | 4 | 2 | 2 | 4 | 6 | 9 | 10 | 13 |
| Renwick | 13 | 13 | 9 | 7 | 4 | 2 | 2 | 4 | 6 | 9 | 11 | 13 |
| Hamilton UVI | 14 | 14 | 10 | 7 | 4 | 3 | 3 | 5 | 7 | 10 | 11 | 13 |
| Manukau City UVI | 14 | 14 | 10 | 7 | 4 | 3 | 3 | 5 | 7 | 10 | 11 | 13 |
| Auckland UVI | 14 | 14 | 10 | 7 | 4 | 3 | 3 | 5 | 7 | 10 | 11 | 13 |