UV Index in John Day, United States

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents and visitors of John Day, United States, where the sunny climate can lead to increased exposure to harmful ultraviolet radiation. The UV levels can spike rapidly, particularly between late morning and early afternoon, reaching a peak of 10 during midday hours. Being aware of these fluctuations is essential not only for preventing sunburn, but also for protecting your skin health in the long run. With John Day's distinct Dsb climate, it's important to stay informed about UV risks to enjoy the outdoors safely while safeguarding your skin from UV damage.

Hourly UV Index in John Day

Today's UV Index presents an intriguing curve, starting the day with a mellow maximum of 1 at 07:00. As the sun climbs higher, things heat up quickly—by 10:00, the index reaches 6, and by 12:00, it peaks at an intense 10. This level remains steady until 14:00, urging sun enthusiasts to take precautions. As the afternoon fades, the UV Index gracefully tapers off, dropping to 4 by 17:00, and finally sinking back to a gentle 1 by 19:00. With mid-day UV levels soaring, it’s crucial to stay protected during those 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	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	10	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 John Day

Throughout the year, seasonal changes in UV exposure are notable, with the highest UV Index values occurring from April to September. Specifically, April to June sees extreme levels, peaking in June (UV Index 11), which necessitates heightened caution. The high-risk months for sun exposure include April to September, where the burn time is significantly reduced (as low as 10 minutes in June). Visitors and residents are advised to take protective measures during these months, such as wearing broad-spectrum sunscreen, protective clothing, and seeking shade during peak sunlight hours to reduce the risk of skin damage. As a reference, in January and December, the UV levels drop considerably, making them safer months for outdoor activities with a burn time of up to 45 minutes.

Monthly Maximum UV Index for John Day, United States

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

The table above highlights how UV exposure in John Day 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.

John Day'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
John Day	3	5	6	9	10	11	10	10	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