NFL teams that went undefeated in December 

December is always a crucial month of any NFL season. With the playoffs beginning in January, it's important for teams to get into a good rhythm in the months leading up to it. Often in the NFL, it's not necessarily the best teams that make the deepest postseason runs, but rather the hottest teams.

Seven NFL teams went undefeated in the month of December during the 2021 NFL season. They are playing great football at the right time and will try to carry their momentum into the NFL playoffs. These seven teams are worth keeping an eye on as the year draws to a close.

The NFL's December Invincibles: #1-#3

#1 - Dallas Cowboys

Dallas Cowboys Ezekiel Elliot and Dak Prescott

The Dallas Cowboys won all four of their games in December. They defeated the Washington Football Team twice while also beating the New Orleans Saints and New York Giants. They are now 11-4 this season, tied for second-best record in the entire NFL.

The Cowboys have the top-ranked offense this season. They lead the NFL with 409.5 yards per game and 30.5 points per game. Dak Prescott leads the most balanced offense in the NFL, ranking third in passing and sixth in rushing. They are the only team ranked in the top eight in both. Additionally, their defense allowed just 14 points per game in December.

#2 - Green Bay Packers

Green Bay Packers quarterback Aaron Rodgers

The Green Bay Packers won all three of their December games as part of their active four-game winning streak. They defeated the Los Angeles Rams in late November, then followed it with wins against the Chicago Bears, Baltimore Ravens and Cleveland Browns. Their 12-3 record is the best in the NFL.

The Packers are in the driver's seat for the top seed in the NFC Playoffs. If they win their final two games, it's theirs. They are the only team in the NFL this season who are undefeated at home. That means home field advantage would be huge for them in the playoffs. Aaron Rodgers is currently the front runner to win the 2021 NFL MVP award.

#3 - Indianapolis Colts

Indianapolis Colts running back Jonathan Taylor

The Indianapolis Colts defeated the Houston Texans, the New England Patriots and the Arizona Cardinals in the month of December. They have been one of the hottest teams in the NFL over the last few months. After starting the season with a 1-4 record, they are 8-2 since then, with six wins in their last seven games.

Superstar running back Jonathan Taylor has been absolutely dominant in the month of December. Across three games, he has accounted for 421 rushing yards and three touchdowns. He has led the entire NFL with 1,626 rushing yards and 17 rushing touchdowns this season. He is one of the favorites for the Offensive Player of the Year award and even the NFL MVP award.

The NFL's December Invincibles:#4-#7

#4 - Kansas City Chiefs

Kansas City Chiefs quarterback Patrick Mahomes

The Kansas City Chiefs have the longest active winning streak in the NFL. They have won their last eight games in a row, including all four in December. They defeated the Denver Broncos, the Las Vegas Raiders, the Los Angeles Chargers and the Pittsburgh Steelers. They went 3-0 against the AFC West division.

The Chiefs have been dominant on both sides of the ball during their recent success. They outscored their opponents 140-56 in December, averaging a 35-14 victory. They are the hottest team in the NFL since opening the season with a mediocre 3-4 record.

#5 - Los Angeles Rams

Los Angeles Rams Matthew Stafford and Cooper Kupp

The Los Angeles Rams entered December with a three-game losing streak. They rebounded in a big way by winning all four of their games in the month. They defeated the Jacksonville Jaguars, the Arizona Cardinals, the Seattle Seahawks and the Minnesota Vikings. By defeating the Cardinals, they took over control of the NFC West divisional race.

Quarterback Matthew Stafford has had a strong season but has been outshined by Cooper Kupp, one of the top offensive players in the NFL this year. Kupp leads the league in a ton of statistical categories, including his 132 receptions, 1,767 receiving yards and 14 receiving touchdowns. He is one of the favorites to win the 2021 Offensive Player of the Year award and a dark horse for the NFL MVP award.

#6 - Miami Dolphins

Miami Dolphins wide receiver Jaylen Waddle

The Miami Dolphins are the comeback story of the year so far in 2021. They won their first game of the season against the New England Patriots but followed it with seven consecutive losses. The season looked lost for them, but they turned things around and are currently on an active seven-game winning streak. It is one of the biggest turnarounds in NFL history.

Included in their current winning streak is the undefeated month of December. They won all three of their games: against the New Orleans Saints, the New York Giants and the New York Jets. Their defense has been the key to their hot streak. They are allowing just 11.7 points per game during their active winning streak.

#7 - Philadelphia Eagles

Philadelphia Eagles quarterback Jalen Hurts

The Philadelphia Eagles struggled through the first part of the 2021 NFL season but have come on strong recently. They have won five of their last six games, including a perfect 3-0 record in December. They defeated the Washington Football Team, the New York Giants and the New York Jets. They averaged a 31-15 victory during their undefeated month.

The biggest key to the Eagles success has been their rushing attack on offense. They used a committee approach while averaging 163.2 rushing yards per game this season, the most in the NFL. Jalen Hurts is one of the best rushing quarterbacks this year. He has accumulated 740 rushing yards. Only Lamar Jackson, with 767, has more among all quarterbacks this season.