The Green Bay Packers beat the Tampa Bay Buccaneers, 21-0, today in one of the snowiest National Football League games ever. More than 36,000 fans stayed home.

The scene was Lambeau Field, where the Packers played in the coldest N.F.L. game, the famed ''Ice Bowl,'' in which the Packers beat the Dallas Cowboys for the league championship, 21-17. The temperature on that day, Dec. 31, 1967, has been variously recalled as minus 16 or minus 17, but it has never been disputed that the wind-chill factor made it feel colder.

Only 19,856 fans attended today, compared to 36,586 who stayed home. Remaining unsold were 485 tickets. Twelve inches of snow had fallen at game time and about four more fell before the final gun. Snow blowers were used at halftime to clear off some of the snow. Winds gusted to 25-35 miles per hour, plunging the wind chill factor to zero.

Despite the weather, the Packers said their plan was to come out throwing. It worked, and the Tampa Bay coach, Leeman Bennett, could attest to that.