UV Index in Jamestown, United States

Last updated: May 3, 2025

Understanding the UV Index is crucial for residents of Jamestown, United States, as it serves as a vital indicator of ultraviolet radiation levels from the sun. With the potential for sunburn and long-term skin damage, keeping track of these levels can be essential for maintaining skin health and ensuring safe outdoor activities. Jamestown, characterized by its Cfa climate, often experiences varying UV exposure throughout the day, peaking at midday with an index reaching a maximum of 11. By staying informed about the UV Index, you can protect yourself and your loved ones from harmful sun exposure, making your time in the sun both enjoyable and safe.

Hourly UV Index in Jamestown

The hourly UV Index reveals a sharp rise in sunlight intensity throughout the morning, starting at a mild 1 at 07:00. By 09:00, it climbs to 5, and by 11:00, it peaks at a striking 9. The highest levels occur during midday, with a maximum 11 reached from 12:00 to 13:00, indicating a very high risk of harm from unprotected sun exposure. As the afternoon progresses, the index gradually declines, settling back to 7 at 15:00 and further down to 1 by 19:00. For those enjoying outdoor activities, it’s crucial to stay sun-safe during the peak hours!

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	5	moderate	30 min
10:00	7	high	25 min
11:00	9	very high	15 min
12:00	11	extreme	10 min
13:00	11	extreme	10 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	1	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Jamestown

Throughout the year, the UV Index varies significantly, with high-risk months occurring primarily from April to August, where the index reaches extreme levels of 10-11. During these months, the recommended burn time drastically decreases, dropping to as low as 10 minutes of unprotected sun exposure. Visitors and residents are advised to take extra precautions during these high UV Index periods by wearing protective clothing, applying sunscreen with a high SPF, and seeking shade during peak hours (10 AM to 4 PM). As the UV Index returns to moderate levels in January, November, and December, the risk of skin damage decreases, but sun safety remains essential year-round.

Monthly Maximum UV Index for Jamestown, United States

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

The table above highlights how UV exposure in Jamestown 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.

Jamestown'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
Jamestown	3	6	7	10	11	11	11	10	9	7	5	3
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