UV Index in Aspen, United States

Last updated: July 2, 2025

In Aspen, United States, being aware of the UV Index is crucial for protecting your skin from harmful ultraviolet rays. Understanding the daily fluctuations in UV levels helps you plan your outdoor activities and take necessary precautions to prevent sunburn and maintain long-term skin health. With its Dfc climate, Aspen experiences significant UV exposure, particularly during peak hours when the Index can reach levels as high as 13. By keeping an eye on the UV Index, you can enjoy the beautiful Colorado outdoors while safeguarding your skin from damage.

Hourly UV Index in Aspen

As the sun rises, the UV Index begins its climb, starting at a modest 1 at 07:00. By 09:00, it reaches 4, signaling the need for sun protection. The intensity peaks at 13 around 13:00, perfect for seeking shade or slathering on sunscreen. Temperatures are sizzling as it slightly dips to 12 by 14:00, then gradually decreases throughout the afternoon. As the day winds down, the UV Index falls to 2 at 18:00 and returns to 1 by 19:00, signaling safer conditions as the sun sets. Keep your skin protected during those peak hours when the UV rays are most intense!

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

Monthly UV Index Trends in Aspen

Throughout the year, UV exposure varies significantly, with the highest risk months falling between March and September. During this period, the UV Index reaches levels categorized as very high to extreme, notably peaking in June at an index of 15 and a burn time of just 10 minutes. Visitors and residents should take precautions, particularly in the summer months, by seeking shade, wearing protective clothing, and applying sunscreen regularly. Conversely, the winter months of January, November, and December feature a moderate UV Index, allowing for safer outdoor activities with a burn time of 30 minutes. As UV levels fluctuate, staying informed and protected is essential for minimizing sun exposure risks year-round.

Monthly Maximum UV Index for Aspen, United States

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

The table above highlights how UV exposure in Aspen 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.

Aspen'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
Aspen	4	6	10	12	13	15	13	12	11	7	5	4