Last updated: July 2, 2025
Understanding the UV Index is crucial for protecting your skin in Heart Butte, United States, where the climate can lead to varying UV exposure levels. As you prepare your outdoor activities, being aware of the UV levels helps you take proactive steps in sunburn prevention and maintaining long-term skin health. With typical peak values reaching up to 9 between 1 PM and 2 PM, it's essential to stay informed about your UV exposure risks, especially in this Dfb climate, known for its sunny summers. Whether you’re enjoying a day outdoors or just spending time in your garden, knowing the UV Index can make all the difference in safeguarding your skin.
At dawn, the UV Index begins its ascent, peaking at a gentle 1 by 07:00. As the morning progresses, it steadily climbs, reaching 2 at 08:00 and hitting 3 by 09:00. The sun reaches its zenith at 12:00, delivering a powerful 8, making midday the prime time for sun exposure. The intensity peaks at 1:00 PM and 2:00 PM, touching 9—the highest of the day—before beginning a gradual decline. By late afternoon, the index drops to 7 at 4:00 PM, signaling a shift towards safer sun conditions. As evening approaches, the UV Index decreases to 3 by 6:00 PM, and during the final hours of daylight, it settles at 2 by 7:00 PM, wrapping up a day of varying UV intensity with a gentle closing. Remember to protect your skin during those high-value hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 3 | moderate | 30 min |
| 10:00 | 5 | moderate | 30 min |
| 11:00 | 7 | 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 | 7 | 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 exposure varies significantly, with the highest risk months occurring from April to August, where the UV Index consistently reaches 9, classifying it as very high. During these months, the burn time is a mere 15 minutes, emphasizing the need for caution. As winter approaches, the UV Index decreases, dropping to 2 in January and December, indicating a low risk of UV exposure, while February and March see moderate levels with indices of 4 and 5, respectively. Visitors and residents should prioritize protective measures such as using sunscreen, wearing protective clothing, and seeking shade, especially in the spring and summer months, when the sun's intensity is at its peak. Staying informed and alert can help mitigate the risks associated with UV exposure year-round.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Heart Butte | 2 | 4 | 5 | 8 | 9 | 9 | 9 | 9 | 7 | 5 | 3 | 2 |
| 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 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |