FIG. 1 is a front perspective view of the snowmobile hood according to my new design; FIG. 2 is a rear elevation view thereof; FIG. 3 is a front elevation view thereof; FIG. 4 is a left side elevation view thereof; FIG. 5 is a right side elevation view thereof; and, FIG. 6 is a top plan view thereof. The broken lines are included for the purpose of illustrating only and form no part of the claimed design.