One of the warmest winters on record in the Chicago area has been deceptively dangerous for a few of those lured onto thin outdoor ice.

A prominent local businessman in Johnsburg died Sunday after he fell through the ice where he was playing hockey with his son. Earlier this month, an ice fisherman died after crashing through the surface on Pistakee Lake, also in McHenry County. In Streamwood on Monday, police said a 43-year-old man who was riding his bicycle in a park fell into a partially frozen pond, but he was rescued and in good condition.

Those who track ice thickness say Chicago-area waterways this winter have never been safe for skating, ice fishing or other activities. One local official is proposing a monitoring system to warn people about the thickness of the ice on the Chain O’ Lakes in the far northwest suburbs.

Read the full story: chicagotribune.com.