UV Index in Alturas, United States

Last updated: June 2, 2025

In Alturas, United States, being aware of the UV Index is crucial for safeguarding your health under the sun. Understanding UV levels helps you take proactive measures against sunburn and long-term skin damage. Nestled in a Csb climate zone, Alturas experiences unique weather patterns that can lead to variable UV exposure throughout the day. With peak indices soaring up to 12 around midday, it's essential to check local UV levels regularly and adjust your sun protection accordingly. Stay informed to enjoy the outdoors safely!

Hourly UV Index in Alturas

Throughout the day, the UV Index displayed a dynamic pattern, peaking at an intense 12 around 1 PM. Starting off gently at 1 by 7 AM, it climbed steadily, reaching 9 by 11 AM, a clear sign to take precautions. As the sun approached its zenith, the index swelled to its maximum at 12 PM, emphasizing the importance of sun safety. Following the midday peak, the index gradually decreased, dropping to 9 by 3 PM, then tapering off further to 2 by 6 PM and 1 by 7 PM. This data underscores the significance of shielding oneself from the sun's harmful rays during the day, especially when the UV Index is at its highest.

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	7	high	25 min
11:00	9	very high	15 min
12:00	11	extreme	10 min
13:00	12	extreme	10 min
14:00	11	extreme	10 min
15:00	9	very high	15 min
16:00	6	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

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