UV Index in Mason City, United States

Last updated: July 2, 2025

Understanding the UV Index in Mason City, United States, is crucial for protecting your skin and maintaining overall health. With its Dfa climate, which features hot summers and significant sun exposure, being aware of UV levels can help mitigate the risks of sunburn and long-term skin damage. On days when the UV Index peaks at 10 during midday hours, preventative measures become even more vital to safeguard against harmful effects. By keeping an eye on UV levels, residents can enjoy the sunny days of Mason City while taking informed steps to ensure their skin stays healthy and protected.

Hourly UV Index in Mason City

The UV Index data unveils a dynamic progression of sun intensity throughout the day. Starting low at 1 at 07:00, the index gradually escalates, reaching maximum levels of 10 between 12:00 and 14:00. This peak signals a critical time for sun protection. As the afternoon wanes, the index tapers off to 8 at 15:00, and then descends further to 3 by 17:00, and 2 by 18:00. Ultimately, the day concludes softly with a return to 1 at 19:00. It's essential to stay vigilant during those peak hours to safeguard your skin while enjoying the sun!

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	10	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	3	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Mason City

Throughout the year, UV exposure fluctuates significantly, with the highest risk months being from March to September. Notably, April through June witness the peak UV Index values, reaching 11 in June, classified as extreme, where the burn time shortens to just 10 minutes. In contrast, the winter months of January and December show much lower risks, with UV Index levels at 3 and 2, respectively. Residents and visitors should take heed during the high-risk months by wearing protective clothing, applying sunscreen, and limiting sun exposure, especially during midday when the sun’s rays are most intense. Overall, staying vigilant about UV levels can help prevent skin damage and maintain health year-round.

Monthly Maximum UV Index for Mason City, United States

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

The table above highlights how UV exposure in Mason City 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.

Mason City'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
Mason City	3	5	7	8	10	11	10	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