A light accumulation of snow was measured Thursday in parts of the state, prompting some schools to have delayed openings.

A blast of arctic air is headed into the region on Monday night, leading Connecticut officials to activate the state’s severe cold weather protocol.

Temperatures will be in the 20s and up to about 30 degrees throughout most of the state on Monday, the NWS said. Yet, wind chills will make it feel about 10 degrees colder than it actually is.

Gov. Ned Lamont made the announcement on Wednesday ahead of "some of the coldest weather Connecticut has had in quite a while."

Gov. Ned Lamont has activated Connecticut’s severe cold weather protocol through Wednesday at noon as Arctic air pushes temperatures well below normal and wind chills drop into negative territory.

"It won't be until the second cold front passes through later in the week when colder and more winter like temperatures return to the region," the weather service's New York office said in its forecasters' discussion. Thursday night will see temperatures drop into the 20s and teens.

NOAA recommends viewing the lights between 10 p.m. and 2 a.m., though it's possible to see them outside of those hours. The agency also suggests seeking out higher elevation — the aurora can be visible for 600 miles north if the onlooker is watching from an unobstructed view on top of a hill. Darkness is also key.