UV Index in Napoleon, United States

Last updated: May 3, 2025

In Napoleon, United States, awareness of the UV Index is crucial for protecting your skin and overall health. Understanding the UV levels helps you avoid sunburn and long-term skin damage, especially during the sunniest hours of the day. With a Dfb climate, Napoleon experiences a range of UV exposure risks, peaking sharply around noon with indices reaching as high as 10. By staying informed about the UV Index, residents can enjoy the beautiful outdoors while taking necessary precautions to safeguard their skin.

Hourly UV Index in Napoleon

The UV Index throughout the day highlights a notable rise in intensity, peaking at 10 around 1 PM. Early hours show a modest index of 1 at 7 AM and 8 AM, indicating minimal sun exposure risk. However, as the sun ascends, the index climbs steadily, hitting 7 by 11 AM, and surging to 9 at noon. The highest point at 1 PM signals a strong need for sun protection, before gradually tapering off to 6 at 4 PM, and finally dipping back to 1 by 7 PM. For those enjoying outdoor activities, midday precautions are essential to ensure safety under the vibrant 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	1	low	45 min
09:00	3	moderate	30 min
10:00	4	moderate	30 min
11:00	7	high	25 min
12:00	9	very high	15 min
13:00	10	very high	15 min
14:00	9	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 Napoleon

Throughout the year, the UV Index experiences significant fluctuations, with the highest levels occurring during the summer months. High-risk months for UV exposure include April through September, when the UV Index reaches very high levels of 9 or 10, significantly reducing the safe burn time to just 15 minutes. Visitors and residents are strongly advised to take precautions during these months, including wearing protective clothing, applying broad-spectrum sunscreen, and seeking shade during peak sun hours. Conversely, the winter months of December and January present lower UV risks, with indices of 2 and 3, allowing for safer exposure times of 30 to 45 minutes. Overall, awareness of seasonal changes in UV levels is crucial for protecting skin health throughout the year.

Monthly Maximum UV Index for Napoleon, United States

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

The table above highlights how UV exposure in Napoleon 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.

Napoleon'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
Napoleon	3	5	6	9	9	10	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