UV Index in Jefferson, United States

Last updated: June 2, 2025

In Jefferson, United States, staying aware of the UV Index is essential for maintaining your skin health and preventing sunburns. With a Cfa climate, residents and visitors alike need to understand the varying levels of UV exposure throughout the day, especially during peak hours from 10 AM to 4 PM, when the UV Index can soar to 11. By monitoring these levels, you can take proactive measures to protect yourself from harmful UV rays and enjoy the sun safely!

Hourly UV Index in Jefferson

As the sun rises, the UV Index starts low at 1 at 07:00 and 08:00, perfect for a leisurely morning. By 09:00, it climbs to 3, signaling that it's time to enjoy some shade. The intensity peaks sharply at 12:00 with a maximum index of 10, indicating a high risk of harm from unprotected sun exposure. Continuing at 13:00 and 14:00, the index holds steady at 11, urging caution with the midday sun blazing down. As the afternoon progresses, the UV levels begin to wane, dropping to 7 by 16:00, and further decreasing to 2 by 18:00. Finally, the day winds down with a gentle 1 at 19:00, marking a safe return to outdoor activities as the sun sets. Be sure to protect your skin 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	1	low	45 min
09:00	3	moderate	30 min
10:00	5	moderate	30 min
11:00	8	very high	15 min
12:00	10	very high	15 min
13:00	11	extreme	10 min
14:00	11	extreme	10 min
15:00	10	very high	15 min
16:00	7	high	25 min
17:00	5	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Jefferson

Throughout the year, UV exposure fluctuates significantly, peaking in the summer months. The highest risk for sunburn occurs from April to August, when the UV Index consistently reaches 11 (extreme). During these months, the recommended burn time is a mere 10 minutes, highlighting the urgent need for protective measures. In March and September, the UV Index remains very high at 8 and 10, respectively, urging caution with a burn time of 15 minutes. Meanwhile, January, February, November, and December experience lower UV levels, categorized as moderate to high, with more extended burn times. Visitors and residents are advised to take appropriate precautions, such as wearing sunscreen, protective clothing, and seeking shade, especially during the peak summer months.

Monthly Maximum UV Index for Jefferson, United States

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

The table above highlights how UV exposure in Jefferson 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.

Jefferson'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
Jefferson	4	6	8	11	11	11	11	11	10	8	6	3
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5