UV Index in Alturas, United States

Last updated: June 2, 2025

Understanding the UV Index is crucial for residents of Alturas, United States, where sun exposure can vary greatly throughout the day. A high UV Index not only signifies the risk of sunburn but also plays a vital role in maintaining skin health. Particularly during the peak hours around noon, when the UV Index can reach a striking 12, it's imperative to protect your skin. Given Alturas' Cfa climate, characterized by warm summers and ample sunshine, being aware of UV levels can help you enjoy the outdoors safely and prevent long-term skin damage. Stay informed and keep your skin safe!

Hourly UV Index in Alturas

The UV Index throughout the day presents a dramatic rise and fall in sun exposure. Starting at a gentle 1 in the early hours of 7:00 AM and 8:00 AM, the index swiftly climbs to 3 by 9:00 AM. As the sun reaches its peak, the UV index skyrockets to a maximum of 12 at 1:00 PM, indicating high levels of UV radiation. Even in the afternoon, the index remains noteworthy: 11 at 2:00 PM and 10 at 3:00 PM. As the day transitions towards evening, levels dip gradually to 4 by 5:00 PM, and further down to 1 by 7:00 PM. This data underscores the importance of sun protection, especially during the midday hours when UV exposure is at its peak.

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	1	low	45 min
09:00	3	moderate	30 min
10:00	5	moderate	30 min
11:00	8	very high	15 min
12:00	11	extreme	10 min
13:00	12	extreme	10 min
14:00	11	extreme	10 min
15:00	10	very high	15 min
16:00	7	high	25 min
17:00	4	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Alturas

As the seasons change, so do UV levels, significantly impacting skin safety for both visitors and residents. From January to March, the UV Index rises from 6 to 10, indicating high to very high exposure risk, with burn times decreasing from 25 minutes to just 15 minutes. April through August marks the peak months for UV intensity, consistently at 12, categorized as extreme, where even short exposures of 10 minutes can lead to sunburn. In September, UV levels remain high at 11 before tapering off through October with a 9, and finally decreasing to 5 in December, classified as moderate. For optimal sun safety, it is crucial for individuals to plan outdoor activities accordingly, particularly during the spring and summer months, ensuring protective measures such as sunscreen, clothing, and shade are utilized.

Monthly Maximum UV Index for Alturas, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Alturas. 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 Alturas, 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 Alturas UV Index with Other United States Cities

The table above highlights how UV exposure in Alturas 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.

Alturas'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
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5
Alturas	6	8	10	11	12	12	12	12	11	9	7	5