Low pressure developed along the Middle Atlantic coast on Wednesday December 16, 2020. The low deepened as it tracked northward towards Long Island, NY through the night on December 16, 2020. Arctic high pressure situated over southeast Canada provided a cold and dry air mass ahead of the low supporting moderate to locally heavy snowfall at the onset. The low pressure ultimately tracked from near Atlantic City, NJ to about 50 miles south of Fire Island, NY before sliding offshore Thursday December 17, 2020. This track led to a brief period of a wintry mix of snow and sleet across southwest Connecticut and a wintry mix of snow, sleet, and rain across southeast Connecticut during the earlier morning hours on December 17, 2020.  Once the low began moving away from Long Island, the wintry mix changed back over to snow and any location that rose above freezing fell significantly below freezing. The storm significantly impacted travel during the evening commute on Wednesday December 16, 2020 and the morning commute on Thursday December 17, 2020. Many accidents resulted from the snow and icy conditions. Snowfall rates ranged from 1 to 2 inches per hour Wednesday evening. Total snowfall ranged from around 6 to 12 inches with locally higher amounts up to 14.5 inches across the northern tier of Fairfield County.

Winter Storm in NORTHERN NEW HAVEN, CONNECTICUT
From 16-DEC-20 19:00:00 to 17-DEC-20 14:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Amateur radio reported 12 inches of snow was reported in both Wallingford and Guilford, CT. CoCoRaHS, amateur radio, and trained spotters measured 7 to 12 inches of snow. The Meriden Airport ASOS measured a 39 mph wind gust at 10:53 am on December 17, 2020.

Winter Storm in SOUTHERN MIDDLESEX, CONNECTICUT
From 16-DEC-20 19:00:00 to 17-DEC-20 14:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Broadcast media measured 6 inches of snow in Clinton. Amateur Radio reported 9 inches of snow in Westbrook. The nearby Chester Airport AWOS measured a 44 mph wind gust at 11:35 am on December 17, 2020.

Winter Storm in SOUTHERN NEW LONDON, CONNECTICUT
From 16-DEC-20 19:00:00 to 17-DEC-20 14:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS and trained spotters measured 6 to 10 inches of snow. The Groton Airport ASOS measured a 48 mph wind gust at 11:40 am on December 17, 2020.

Winter Storm in NORTHERN MIDDLESEX, CONNECTICUT
From 16-DEC-20 19:00:00 to 17-DEC-20 14:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Amateur radio in Killingworth reported 12 inches of snow. CoCoRaHS 1 mile north of Higganum measured 11 inches of snow. The Chester Airport AWOS measured a 44 mph wind gust at 11:35 am on December 17, 2020.

Winter Storm in SOUTHERN FAIRFIELD, CONNECTICUT
From 16-DEC-20 18:00:00 to 17-DEC-20 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The Official NWS Observation at Bridegport was 9.4 inches of snow. CoCoRaHS, amateur radio, and the public measured 6 to 10 inches of snow. The Bridgeport Airport ASOS measured a 47 mph wind gust at 8:52 am on December 17, 2020.

Winter Storm in SOUTHERN NEW HAVEN, CONNECTICUT
From 16-DEC-20 19:00:00 to 17-DEC-20 14:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters and amateur radio reported 6 to 10 inches of snow. The New Haven Airport measured a 52 mph wind gust at 10:53 am on December 17, 2020.

Winter Storm in NORTHERN NEW LONDON, CONNECTICUT
From 16-DEC-20 19:00:00 to 17-DEC-20 14:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters, COOP Observer, and CoCoRaHS measured 6 to 10 inches of snow. The nearby Groton Airport ASOS measured a 48 mph wind gust at 11:40 am on December 17, 2020.

Winter Storm in NORTHERN FAIRFIELD, CONNECTICUT
From 16-DEC-20 18:00:00 to 17-DEC-20 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters, CoCoRaHS, and amateur radio measured 9 to 14.5 inches of snow. The 14.5 inches of snow was measured 5 miles north-northwest of Danbury.  The Danbury Airport ASOS measured a 43 mph wind gust at 9:53 pm on December 16, 2020.