UV Index in Alturas, United States

Last updated: May 3, 2025

Understanding the UV Index in Alturas, United States is essential for protecting your skin from harmful ultraviolet radiation. With maximum UV levels reaching as high as 11 during the day, the risk of sunburn and long-term skin damage increases significantly, particularly around midday when exposure is at its peak. Alturas, located in a Csb climate zone, experiences unique weather patterns that can elevate UV exposure risks even on cloudy days. Being proactive about UV Index awareness not only promotes skin health but also helps you enjoy the great outdoors safely.

Hourly UV Index in Alturas

Expect a sunny day with a fluctuating UV Index that peaks at 11 around midday. The morning starts off gentle, with values rising from 1 at 7:00 AM to 4 by 9:00 AM. As the sun climbs higher, the UV Index escalates sharply, reaching 9 by 11:00 AM and hitting its highest point of 11 at both 12:00 PM and 1:00 PM. After the sun’s zenith, the UV levels gradually decline, dropping to 10 at 2:00 PM and tapering off to 1 by 7:00 PM. Remember to protect your skin during those peak hours for a safe and enjoyable day outdoors!

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	4	moderate	30 min
10:00	6	high	25 min
11:00	9	very high	15 min
12:00	11	extreme	10 min
13:00	11	extreme	10 min
14:00	10	very high	15 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 Alturas

Throughout the year, the UV Index exhibits notable seasonal fluctuations, peaking in the summer months. From January to February, the UV Index remains moderate at levels 4-5, with a burn time of 30 minutes. As spring approaches, March marks the transition to higher risk with an index of 7 (high) and a reduced burn time of 25 minutes. The highest risk occurs from April to August, with UV Index values reaching extremes of 11-12, necessitating a burn time of just 10 minutes. September sees a slight decrease to a UV Index of 9 (very high), while the risk continues to diminish in October (high, index of 7) before returning to moderate levels of 4 in November and 3 in December. Visitors and residents should be especially cautious from April to August, minimizing sun exposure during peak hours and using protective measures such as sunscreen, hats, and clothing to safeguard against harmful UV radiation.

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
Alturas	4	5	7	9	11	12	11	11	9	7	4	3
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