Will the 2020 Volvo S90 clear the snow?

No. 6 in of snow is too deep.

6in of clearance

Snow depth, inches

6 inches of snow.

2020 Volvo S90 T6 Momentum AWD. Side view, to scale in height.

2020 Volvo S90: clearance by trim vs 6 in of snow
Trim	Drivetrain	Clearance, in	Margin	Clears
T6 Momentum AWD	AWD	6	+0 in	No
T6 Inscription AWD	AWD	6	+0 in	No
T6 R-Design AWD	AWD	6	+0 in	No
T8 eAWD Plug-In Hybrid Inscription AWD	AWD	6	+0 in	No
T8 eAWD Plug-In Hybrid R-Design AWD	AWD	6	+0 in	No
T8 Inscription AWD	AWD	6	+0 in	No
T8 R-Design AWD	AWD	6	+0 in	No

What this cannot tell you

Clearance at rest, empty. Load lowers it.

Tires and drivetrain not scored.