The notice was for Delaware and Philadelphia counties.

“Temperatures are warming above freezing,” states the National Weather Service.

Freeze notice – that’s what it means

Frost advisories are issued from May through October (but may be extended if necessary) when temperatures, winds, and sky cover are favorable for frost development. This is most likely to happen when the temperature is 36 degrees or less. In some cases, the frost is severe enough to end the growing season and is then referred to as a “killing frost.”

According to the weather service, if a frost advisory is issued for your area, cover sensitive plants before sunset so they can help retain heat near the plants, or move plants indoors for the night if possible.

Advance Local Weather Alerts is a service provided by United Robots that uses machine learning to compile the latest data from the National Weather Service.