UV Index in Crestline, United States

Last updated: June 2, 2025

In Crestline, United States, awareness of the UV Index is crucial for maintaining healthy skin and preventing sunburn. Understanding UV levels not only helps you plan outdoor activities but also protects against long-term skin damage and increases the risk of skin cancer. Given Crestline's Csa climate, characterized by warm summers and moderate UV exposure, it's essential to stay informed about daily UV trends. During peak hours, especially from 11:00 AM to 1:00 PM, the UV Index can soar to levels as high as 12, making sun safety practices especially vital for residents and visitors alike.

Hourly UV Index in Crestline

As the sun rises, the UV Index begins its ascent, starting at a gentle 1 by 7:00 AM. By 9:00 AM, it reaches a moderate 5, but soon after, the intensity peaks. At 11:00 AM, the index hits 10, and by noon, it soars to a scorching 12, indicating a high risk of harm from unprotected sun exposure. The afternoon maintains this intensity, with the index remaining steady at 12 until 1:00 PM, before gradually declining. By 3:00 PM, it starts its descent to 8, then dips further to 6 by 4:00 PM, and settles back to a safer 2 by 6:00 PM. As the sun begins to set, the evening returns to a minimal 1 by 7:00 PM, reminding us to enjoy the daytime sun responsibly.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
Time	UVI	Category	Time to Burn
07:00	1	low	45 min
08:00	2	low	45 min
09:00	5	moderate	30 min
10:00	8	very high	15 min
11:00	10	very high	15 min
12:00	12	extreme	10 min
13:00	12	extreme	10 min
14:00	11	extreme	10 min
15:00	8	very high	15 min
16:00	6	high	25 min
17:00	3	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Crestline

The UV Index experiences significant seasonal variation, peaking between March and August when exposure levels reach extreme categories. Notably, April, May, and June have the highest readings at 11 and 12, indicating a burn time as short as 10 minutes during these months. Visitors and residents should be particularly cautious from March to August, with March and April marking the onset of these high-risk months. During this time, it is advisable to wear protective clothing, apply sunscreen frequently, and seek shade whenever possible, especially during midday hours. As fall approaches, the UV Index begins to decline, offering slightly safer conditions in October and November, yet vigilance is still recommended during these months with moderate exposure.

Monthly Maximum UV Index for Crestline, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Crestline. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.

Data source: Statistical UV Index data for Crestline, based on information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

Compare Crestline UV Index with Other United States Cities

The table above highlights how UV exposure in Crestline compares to other major locations across United States. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.

Crestline's solar exposure compared to other cities in United States. Generated using Copernicus Atmosphere Monitoring Service information.
	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
Crestline	4	6	9	11	11	12	12	11	10	8	5	4
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5