Hour-by-Hour: Winchester's Plummet to Subzero Temperatures

A dangerous cold snap will hit the region early Friday morning, pushing wind chill values down to as low as 20 degrees below zero.

The National Weather Service issued a wind chill advisory for eastern Massachusetts and most of Rhode Island on Friday from 3 a.m. to 10 a.m. In weather that cold, frostbite on bare skin can set in after 30 minutes of exposure.

Temperatures are expected to marginally warm up by Friday afternoon.

Here’s the hour-by-hour forecast for Winchester from The Weather Channel:

Thursday

• 12 p.m.— 26 degrees, feels like 14 degrees (plus, Light Snow)
• 1 p.m.— 25 degrees, feels like 13 degrees
• 2 p.m.— 24 degrees, feels like 11 degrees
• 3 p.m.— 24 degrees, feels like 9 degrees
• 4 p.m.— 23 degrees, feels like 9 degrees (plus, Few Snow Showers)
• 5 p.m.— 20 degrees, feels like 5 degrees
• 6 p.m.— 18 degrees, feels like 2 degrees
• 7 p.m.— 16 degrees, feels like -1 degrees
• 8 p.m.— 13 degrees, feels like -5 degrees
• 9 p.m.— 10 degrees, feels like -8 degrees
• 10 p.m.— 9 degrees, feels like -10 degrees
• 11 p.m.— 7 degrees, feels like -11 degrees

Friday

• 12 a.m.— 6 degrees, feels like -13 degrees
• 1 a.m.— 5 degrees, feels like -14 degrees
• 2 a.m.— 3 degrees, feels like -15 degrees
• 3 a.m.— 2 degrees, feels like -17 degrees
• 4 a.m.— 1 degree, feels like -18 degrees
• 5 a.m.— 0 degrees, feels like -20 degrees
• 6 a.m.— 1 degree, feels like -18 degrees
• 7 a.m.— 1 degree, feels like -18 degrees
• 8 a.m.— 3 degrees, feels like -14 degrees
• 9 a.m.— 5 degrees, feels like -12 degrees
• 10 a.m.— 8 degrees, feels like -9 degrees
• 11 a.m.— 11 degrees, feels like -6 degrees
• 12 p.m.— 13 degrees, feels like -3 degrees
• 1 p.m.— 15 degrees, feels like -1 degree
• 2 p.m.— 16 degrees, feels like 0 degrees
• 3 p.m.— 16 degrees, feels like 1 degree
• 4 p.m.— 16 degrees, feels like 1 degree
• 5 p.m.— 14 degrees, feels like -1 degree

Wind chill values will remain in the subzero region until Saturday, when temperatures will rise to about 25 degrees. There’s a strong likelihood of a wintry mix of snow, sleet, and rain Saturday night and Sunday, according to NWS. That could exacerbate the danger of roof collapses, as the region has seen about 5 feet of snow in February alone.