The NFL, in its 2018 rulebook, has made it a 15-yard penalty if a team has anyone clear the field on a snowy day to make it easier for a player to kick a field goal, extra point or kickoff, or to punt.
In a game late last season, the Indianapolis Colts had several players and sideline personnel clear snow off the field to give Adam Vinatieri better footing for a game-tying extra point against the Buffalo Bills.