Last updated: August 1, 2025
Awareness of the UV Index is crucial for residents of Johnson, United States, as it provides essential information to protect against harmful ultraviolet radiation. Understanding UV levels is vital for preventing sunburn and promoting long-term skin health. With a BSk climate, Johnson experiences fluctuating UV exposure, peaking at noon with an index that can reach 11, indicating a high risk of harm. By staying informed about the UV Index, you can enjoy the sun safely while minimizing your risk of skin damage.
As the sun rises, the UV Index begins its slow ascent, starting at a mere 1 at 7:00 AM and remaining low until 9:00 AM, when it nudges up to 2. However, the real intensity hits around 11:00 AM, peaking at an impressive 11 by 1:00 PM. The afternoon hours maintain this high level, with the UV Index reaching a maximum of 10 at 3:00 PM, before gradually descending. By 5:00 PM, it dips to 6, and as evening approaches, the values drop to 3 by 6:00 PM, finally falling to 2 by 7:00 PM. This data suggests that midday is the time to take extra precautions, as UV exposure is at its most dangerous!
| 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 | 6 | high | 25 min |
| 12:00 | 9 | very high | 15 min |
| 13:00 | 10 | very high | 15 min |
| 14:00 | 11 | extreme | 10 min |
| 15:00 | 10 | very high | 15 min |
| 16:00 | 8 | very high | 15 min |
| 17:00 | 5 | moderate | 30 min |
| 18:00 | 3 | moderate | 30 min |
| 19:00 | 1 | low | 45 min |
The UV Index experiences notable seasonal fluctuations, significantly impacting sun exposure risk throughout the year. From January to February, UV levels remain moderate, making burn times approximately 30 minutes. However, as spring arrives in March and peaks in April, the UV Index surges to very high levels of 8 and 10, respectively, reducing burn times to just 15 minutes. The summer months of May through August present the highest risk, with extreme UV Index readings of 11 to 12 and burn times dropping to 10 minutes. In September, the risk diminishes slightly but remains very high, while by October, it further decreases to a high index of 7, allowing for a burn time of 25 minutes. As winter approaches, November and December return to moderate UV levels. Visitors and residents are advised to take protective measures during the high-risk months of March to September, including using sunscreen, wearing protective clothing, and seeking shade whenever possible.
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 |
| Los Angeles UVI | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 10 | 10 | 7 | 5 | 4 |
| Johnson | 4 | 5 | 8 | 10 | 11 | 12 | 12 | 11 | 10 | 7 | 5 | 3 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |