UV Index in Johnstonville, United States

Last updated: June 2, 2025

In Johnstonville, United States, awareness of the UV Index is crucial for protecting your skin from harmful rays. Understanding UV levels not only helps in preventing sunburn but also plays a vital role in long-term skin health. With a climate classified as Csb, Johnstonville experiences varying UV exposure throughout the day, peaking at an intense 11 to 12 between noon and early afternoon. Being informed about these levels empowers residents and visitors alike to enjoy outdoor activities safely while minimizing the risk of UV-related health issues.

Hourly UV Index in Johnstonville

Throughout the day, the UV Index displayed a dynamic pattern, peaking at an intense 12 around 1 PM. Starting off gently at 1 by 7 AM, it climbed steadily, reaching 9 by 11 AM, a clear sign to take precautions. As the sun approached its zenith, the index swelled to its maximum at 12 PM, emphasizing the importance of sun safety. Following the midday peak, the index gradually decreased, dropping to 9 by 3 PM, then tapering off further to 2 by 6 PM and 1 by 7 PM. This data underscores the significance of shielding oneself from the sun's harmful rays during the day, especially 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	7	high	25 min
11:00	9	very high	15 min
12:00	11	extreme	10 min
13:00	12	extreme	10 min
14:00	11	extreme	10 min
15:00	9	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 Johnstonville

Throughout the year, the UV Index experiences significant fluctuations, with high-risk months primarily occurring from March to September. During these months, particularly in May, June, July, and August, the UV Index reaches extreme levels (11-12), requiring individuals to take extra precautions with an average burn time of just 10 minutes. In contrast, the months of January, February, November, and December have a moderate Index (3-4), allowing for safer sun exposure with burn times up to 30 minutes. Visitors and residents are advised to be vigilant during the peak months, utilizing sunscreen, wearing protective clothing, and seeking shade to mitigate the risk of UV-related harm.

Monthly Maximum UV Index for Johnstonville, United States

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

The table above highlights how UV exposure in Johnstonville 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.

Johnstonville'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
Los Angeles UVI	4	6	8	9	10	11	11	10	10	7	5	4
Johnstonville	4	5	8	9	11	12	11	11	9	7	4	3
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5