UV Index in Custer, United States

Last updated: May 3, 2025

In Custer, United States, staying informed about the UV Index is crucial for protecting your skin and maintaining overall health. Understanding the daily UV levels can help you take necessary precautions against sunburn and reduce long-term risks of skin damage. With a Dfb climate, Custer experiences a unique blend of seasons, but UV exposure can peak dramatically during sunny days, especially between 11:00 AM and 2:00 PM when levels reach up to 9. Being aware of these fluctuations ensures you enjoy outdoor activities safely while safeguarding your skin against excessive UV radiation.

Hourly UV Index in Custer

The UV Index throughout the day presents a clear pattern of intensity, peaking at midday. Starting from a mild level of 1 at 07:00, the index rises steadily, reaching 2 by 08:00. The real surge occurs between 09:00 and 13:00, where it escalates from 4 to a striking 9—the highest point of the day. As the afternoon unfolds, the intensity slightly declines to 7 at 15:00, before tapering off to 5 at 16:00. The evening sees a further decrease, settling back to 2 by 18:00 and returning to 1 at 19:00. For those enjoying outdoor activities, it’s essential to take precautions, especially during the peak hours from 11:00 to 14:00 when the UV rays are most potent.

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	8	very high	15 min
12:00	9	very high	15 min
13:00	9	very high	15 min
14:00	9	very high	15 min
15:00	7	high	25 min
16:00	5	moderate	30 min
17:00	3	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Custer

Throughout the year, the UV Index varies significantly, indicating changing levels of sun exposure risk. The highest risk months are June and July, both classified as having an extreme UV Index of 11, which corresponds to a burn time of just 10 minutes. The very high risk persists in April, May, August, and September, where visitors should be particularly cautious, with burn times ranging from 15 to 25 minutes. As UV levels drop in the fall and winter, January, February, and November present a moderate risk with burn times around 30 minutes, while December brings a low risk, allowing for a safer 45-minute burn time. It is essential for residents and visitors to take proactive sun safety measures, especially during the higher risk months, such as wearing sunscreen, hats, and protective clothing when spending extended time outdoors.

Monthly Maximum UV Index for Custer, United States

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

The table above highlights how UV exposure in Custer 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.

Custer'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
Custer	3	5	6	9	9	11	11	10	8	6	3	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