UV Index in Penn Valley, United States

Last updated: May 3, 2025

Understanding the UV Index in Penn Valley, United States, is crucial for safeguarding your skin against harmful ultraviolet radiation. With the potential for sunburn and long-term skin health issues, being aware of daily UV levels empowers residents to take proactive measures, especially during peak exposure hours. Nestled in a Csa climate zone, Penn Valley experiences unique weather patterns that can elevate UV exposure risks, particularly under clear skies. By staying informed about the UV Index, you can enjoy the outdoors safely while protecting your skin’s health.

Hourly UV Index in Penn Valley

At dawn, the UV Index starts at a mild 1 by 07:00, gradually climbing to 2 by 08:00 as the sun rises. The warmth intensifies, reaching 4 at 09:00 and peaking at a significant 10 between noon and 14:00, signaling the need for sun protection. As the afternoon rolls in, the index begins to dip, settling at 8 by 15:00 before tapering off further to 5 at 16:00. By the evening, the UV levels gracefully descend back to 2 at 18:00 and return to a safe 1 by 19:00, marking a day's journey through varying sun exposure. Be mindful of the midday sun, and 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	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 Penn Valley

As the seasons change, so does the UV Index, reflecting the risk of UV exposure throughout the year. January and December see a moderate UV Index of 3, allowing for a burn time of 30 minutes. However, from February to March, the UV levels rise significantly, peaking at 11 during the summer months of June and July, categorized as extreme, with the shortest burn time of only 10 minutes in peak months like June. The high-risk months for UV exposure are clearly April to August, when the UV Index reaches very high to extreme levels. It is advisable for visitors and residents to take necessary precautions, such as wearing sunscreen, protective clothing, and limiting sun exposure during peak hours, especially from late spring to mid-summer. As fall approaches, the risk decreases, with the UV Index dropping back to moderate levels by November.

Monthly Maximum UV Index for Penn Valley, United States

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

The table above highlights how UV exposure in Penn Valley 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.

Penn Valley'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
Penn Valley	3	5	7	8	10	11	11	10	9	6	4	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