A very powerful storm across Ontario (972mb) remained nearly stationary from the evening of December 23rd (Friday) through the morning of December 25th (Sunday). An arctic front associated with this storm moved across Lake Ontario and the St. Lawrence valley during the early afternoon hours of December 23rd but the favored unidirectional SW flow across Lake Ontario didn't establish until Friday evening.
Friday evening through early Sunday morning, a very strong southwest flow of 40 to 50 knots across Lake Ontario led to blizzard conditions across southwest St. Lawrence county through Saturday night and near blizzard conditions at times across northern St. Lawrence county, mainly along/west of Route 11. The lake effect band shifted southeast during Sunday morning, bringing heavy lake effect snow to southeastern St. Lawrence county through Sunday evening.
Some of the higher snowfall totals included 20 to 38 inches in Gouverneur, 20 inches in Morristown, 16 inches n West Fowler, 15 inches in Star Lake and 10 inches in South Colton with 6 to 15 inches across northern St. Lawrence along/west of Route 11.

Blizzard in NORTHERN ST. LAWRENCE, NEW YORK
From 23-DEC-22 21:00:00 to 25-DEC-22 02:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Snow and Travel Emergencies were declared for St. Lawrence county with northern St. Lawrence county west of Route 11, closer to Route 37 witnessing blizzard conditions at times with near zero visibilities, sustained winds 20 to 30 mph and frequent gusts in excess of 40 mph. Snowfall totals were 8 to 15+ inches with the higher amounts west of Route 11.

Lake-Effect Snow in SOUTHEASTERN ST. LAWRENCE, NEW YORK
From 25-DEC-22 04:00:00 to 25-DEC-22 22:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Synoptic snows produced 2 to 5 inches during the afternoon and evening of December 23rd with scattered snow showers on December 24th. The lake effect snow band rotated south across southeast St. Lawrence county on Christmas delivering 8 to 12 inches of snow.

Blizzard in SOUTHWESTERN ST. LAWRENCE, NEW YORK
From 23-DEC-22 19:00:00 to 25-DEC-22 05:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Blizzard conditions across southwest St. Lawrence county with sustained winds 25-30 mph with frequent gusts in excess of 40 mph causing white-out conditions and considerable drifting of the snow. Snowfall totals ranged from 6 inches to 2 to 3 feet across the area with the greatest along and west of Route 11. Snow and Travel Emergencies were declared.

Lake-Effect Snow in NORTHERN ST. LAWRENCE, NEW YORK
From 23-DEC-22 21:00:00 to 25-DEC-22 02:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Snow and Travel Emergencies were declared for St. Lawrence county with northern St. Lawrence county west of Route 11, closer to Route 37 witnessing blizzard conditions at times with near zero visibilities, sustained winds 20 to 30 mph and frequent gusts in excess of 40 mph. Snowfall totals were 8 to 15+ inches with the higher amounts west of Route 11. Elsewhere, lake effect snow, squally snow bands and strong winds produced near blizzard conditions at times along and east of Route 11.