UV Index in Londonderry, United States

Last updated: July 2, 2025

In Londonderry, United States, being aware of the UV Index is essential for protecting your skin and overall health. Understanding UV levels helps you take precautions against sunburn and long-term skin damage, especially during the peak hours of 11 AM to 3 PM when the index can reach a high of 9. Nestled in a Dfb climate zone, Londonderry experiences distinct seasonal variations, exposing residents to varying risks of UV radiation throughout the year. By staying informed about the UV Index, you can enjoy the sun safely while minimizing the potential risks associated with sun exposure.

Hourly UV Index in Londonderry

The UV Index today presents a notable climb as the sun ascends, peaking at 9 around noon and early afternoon, signaling very high sun exposure risk. Starting gently at 1 by 7 AM, the index rises steadily, reaching 6 by 10 AM and then surging to its maximum of 9 between 12 PM and 1 PM. Early afternoon brings a slight decline to 8 at 2 PM, followed by a gradual decrease through the later hours, settling back to 1 by 7 PM. With this trajectory, it's crucial to take precautions during the peak hours of 11 AM to 1 PM, ensuring skin protection against harmful UV rays. Stay safe and enjoy the sun wisely!

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	9	very high	15 min
13:00	9	very high	15 min
14:00	8	very high	15 min
15:00	7	high	25 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 Londonderry

Throughout the year, seasonal changes in the UV Index play a significant role in sun safety for residents and visitors. The highest risk months occur from April to August, with UV Index readings peaking at 10 in May and June, indicating very high exposure levels and a burn time of just 15 minutes. In contrast, winter months like January and February present a moderate risk, with UV Index figures around 3 to 4 and longer burn times of 30 minutes. As such, it is crucial for everyone to stay informed about local UV levels, particularly during the spring and summer months, using proper sun protection measures such as sunscreen, hats, and protective clothing to minimize the risk of skin damage.

Monthly Maximum UV Index for Londonderry, United States

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

The table above highlights how UV exposure in Londonderry 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.

Londonderry'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
Londonderry	3	4	6	8	10	10	9	9	7	6	3	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