UV Index in Castalia, United States

Last updated: May 3, 2025

Understanding the UV Index is crucial for residents of Castalia, United States, where sunny days can quickly escalate into potential skin hazards. Awareness of UV levels is essential for preventing sunburn and maintaining skin health, especially during the peak hours when the UV Index rises to 10 around noon. With a Dfa climate, Castalia experiences distinct seasons that can influence UV exposure, making it vital to stay informed. By monitoring the UV Index, you can better protect yourself and your loved ones from the harmful effects of ultraviolet rays while enjoying the great outdoors.

Hourly UV Index in Castalia

The UV Index for the day presents a striking pattern as the sun rises higher in the sky. Starting with a low of 1 at 07:00 and 08:00, it quickly escalates, hitting 3 by 09:00. As midday approaches, the intensity peaks, reaching an impressive 10 at both 13:00 and 14:00. This marks the time to be particularly cautious under the strengthening rays. The afternoon sees a gradual decline, dropping to 8 at 15:00 and then tapering down to 6 by 16:00. As the sun sets, the index dwindles to a comfortable 2 by 18:00 and finally falls back to 1 by 19:00. It’s a perfect reminder that while the sun can be enjoyable, vigilance during the peak hours is essential for skin safety!

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	7	high	25 min
12:00	8	very high	15 min
13:00	10	very high	15 min
14:00	10	very high	15 min
15:00	8	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 Castalia

During the year, the UV Index shows significant seasonal variations, with peak levels reached in late spring and summer. The highest risk months are from April to September, where the UV Index often exceeds 8, categorized as very high. Particularly, May through August sees a consistent UV Index of 10, indicating a burn time of just 15 minutes for unprotected skin. In contrast, January, February, November, and December have much lower UV levels, with burn times spiking up to 45 minutes during December. To protect against skin damage, visitors and residents should take extra precautions during the high-risk months by wearing sunscreen with high SPF, protective clothing, and seeking shade, especially during peak hours.

Monthly Maximum UV Index for Castalia, United States

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

The table above highlights how UV exposure in Castalia 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.

Castalia'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
Castalia	3	4	6	8	10	10	10	9	8	6	4	2
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