In the U.S., sun exposure peaks during summer afternoons, especially at high noon. Average values of 11 or higher are common in some areas, posing a significant risk for sunburn and skin damage.
Understanding UV Index:
– A moderate level is between 6-7 (high range).
– Above 8-10, it’s considered “very high.”
Factors Affecting UV Index Include:
– Altitude
– Latitude
– Cloud cover
– Ozone levels
– Time of day
– Seasons
A common myth: Cloudy days can still cause sunburn. In fact, up to 80% of solar UV radiation can pass through light cloud cover.
Estimating UV Exposure:
– A simple method is to observe your shadow.
– Don’t rely on feeling the sun’s heat alone; sunburns occur due to UV radiation.
Source: https://www.axios.com/2025/06/19/uv-index-highest-extreme-summer