UV Index in Jefferson, United States

Last updated: June 2, 2025

In Jefferson, United States, awareness of the UV Index is essential for protecting your health and enjoying the great outdoors. Understanding UV levels helps prevent sunburn and long-term skin damage, making it crucial for residents and visitors alike. With a Dfa climate characterized by warm summers, the UV exposure can reach significant levels, peaking at 11 around noon. This highlights the importance of being proactive with sun protection during these high-risk hours to safeguard your skin while basking in the beautiful sunshine of Jefferson.

Hourly UV Index in Jefferson

The UV Index climbs steadily throughout the morning, starting at a modest 1 at 7:00 AM and reaching a more intense 3 by 9:00 AM. As the sun rises higher, the index peaks at an alarming 11 at 1:00 PM, indicating severe UV exposure. This high risk is only slightly alleviated in the following hours, where it drops to 10 at 2:00 PM and gradually decreases to 4 by 5:00 PM. As the evening approaches, the UV Index dips to low levels of 2 at 6:00 PM and returns to 1 by 7:00 PM. Remember, during the midday hours, adequate sun protection is crucial to safeguard your skin from harmful UV rays!

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.
TimeUVICategoryTime to Burn
07:001low45 min
08:002low45 min
09:003moderate30 min
10:006high25 min
11:008very high15 min
12:0010very high15 min
13:0011extreme10 min
14:0010very high15 min
15:009very high15 min
16:007high25 min
17:004moderate30 min
18:002low45 min
19:001low45 min

Monthly UV Index Trends in Jefferson

The UV Index experiences significant seasonal fluctuations, with the highest levels occurring during the summer months. March and April see an uptick as the UV Index rises from 5 to 8, marking the beginning of high-risk periods. May through August represent the peak risk months, where UV Index values reach extremely high levels (up to 11 in June), necessitating strong sun protection measures. Visitors and residents are advised to limit sun exposure, especially between 10 AM and 4 PM, when UV radiation is at its strongest. During these high-risk months, protective clothing, sunscreen, and seeking shade are essential precautions to prevent sunburn and long-term skin damage. As autumn arrives in September, the UV Index begins to gradually decline, but caution is still advisable, particularly in October with a still moderately high index of 6.

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.
JanFebMarAprMayJunJulAugSepOctNovDec35589111098543
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.
 JanFebMarAprMayJunJulAugSepOctNovDec
Chicago UVI34689101098642
Brooklyn UVI35681010998642
New York City UVI35681010998642
Jefferson35589111098643
Los Angeles UVI46891011111010754
Houston UVI589111112121110975