UV Index in Yorktown, United States

Last updated: May 3, 2025

Understanding the UV Index is crucial for residents of Yorktown, United States, where sunny days are abundant and outdoor activities are common. The UV Index provides vital information on the intensity of ultraviolet radiation, highlighting the risks of skin damage and sunburn—essential considerations for safeguarding your skin health. With Yorktown's humid subtropical climate, UV levels can peak at a concerning 10 around noon, making it imperative to stay informed about daily UV exposure and take necessary precautions during the warmer months. By understanding the UV Index, you can enjoy the beautiful outdoor environment while protecting your skin from harmful rays.

Hourly UV Index in Yorktown

The UV Index throughout the day showcases a dynamic pattern of sun exposure, peaking during the afternoon. At 07:00, the index starts low at 1, gradually increasing as the sun rises. By 10:00, it reaches 6, signaling a rise in sun intensity, culminating in a striking 10 from 12:00 to 13:00, indicating a high risk of harm from unprotected sun exposure. As the day progresses, the UV Index declines, dropping to 3 by 17:00, and steadily returning to 1 by 19:00. This data highlights the importance of sun protection, especially during midday when the UV Index is at its highest.

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	9	very high	15 min
15:00	8	very high	15 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 Yorktown

Throughout the year, UV exposure varies significantly, with the highest risks occurring from April to September. During this period, the UV Index peaks, reaching 11 in July, categorized as extreme, and indicating a burn time of just 10 minutes. Residents and visitors should be particularly vigilant from February to October, as these months see high to very high UV levels, with April to August presenting the most risk. To protect against harmful UV radiation, it is advisable to wear sunscreen, protective clothing, and sunglasses, and to seek shade during peak sun hours, especially from late morning to early afternoon. Conversely, the winter months of December and January see moderate UV levels, allowing for more extended outdoor exposure with a burn time of 30 minutes.

Monthly Maximum UV Index for Yorktown, United States

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

The table above highlights how UV exposure in Yorktown 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.

Yorktown'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
Yorktown	3	6	7	9	10	10	11	10	8	8	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