UV Index in South Greeley, United States

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents of South Greeley, as it plays a vital role in protecting your skin from harmful ultraviolet rays. With peak UV levels reaching as high as 12 around midday, awareness of these readings can significantly aid in sunburn prevention and long-term skin health. South Greeley, characterized by its semi-arid BSk climate, presents unique challenges regarding UV exposure, particularly during the summer months when risks are elevated. By keeping an eye on the UV Index, you can enjoy the outdoors safely while safeguarding your skin.

Hourly UV Index in South Greeley

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 South Greeley

Throughout the year, the UV Index experiences notable fluctuations, with the highest risk months typically occurring from April to August. During this period, the UV Index reaches levels classified as very high to extreme, particularly peaking at 12 in June and July, which corresponds to a burn time of just 10 minutes. In contrast, the winter months of January, November, and December show a much lower UV Index, remaining in the moderate category at 4, allowing for a burn time of 30 minutes. As such, it is crucial for visitors and residents to be particularly vigilant about sun protection—especially in late spring and summer. Sunscreen, protective clothing, and seeking shade during peak hours are highly recommended to mitigate harmful effects from exposure during high UV Index periods.

Monthly Maximum UV Index for South Greeley, United States

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

The table above highlights how UV exposure in South Greeley 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.

South Greeley'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
South Greeley	4	6	7	10	10	12	12	11	9	6	4	4
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