Memorial Day in Chicago kicked off with blue skies, temperatures in the 80s and plenty of sunshine, bringing the feeling of summer to many as beaches opened for the season across the city and suburbs.
But what about the UV index?
According to the National Weather Service, the UV index is a measure that helps determine the effects of the sun on outdoor activities. It runs on a scale of 1 to 11+ and is computed using forecast ozone levels, cloudiness and elevation.
“Values are effective at solar noon, which is when the sun is at its highest point of the day,” the NWS said. “Overexposure during days with high UV values can be harmful, both in the short term and over the long term. ”
Exposure to things that reflect light, like sand and water, can make the UX index even higher in some locations, the NWS said.
A UV Index reading of 1-2 is “low,” the NWS said, which means “low danger” from the sun’s UV rays for the average person. A UV Index reading of 3-5 ranks as “moderate,” and 6-7 ranks as “high,” with officials advising those outside to reduce time outside, wear sunglasses and use a sunscreen with an SPF of 30 or higher.
“Very high” ranks as 8-10, with people advised to take extra precautions against sun damage.
“Wear a wide-brimmed hat and sunglasses, use sunscreen of at least SPF-30, and wear a long-sleeved shirt and pants if practical,” the NWS said. “White sand on the beach will reflect UV rays and can double UV exposure.”
According to the NWS, Chicago ranked as an 8 on the UV Index Monday, or “very high.”
You can see the UV index near you by using the NWS’ tracker here.
