American cities with the most unusually warm temperatures this year | This list of U.S. cities that had far hotter temperatures in September than the historical average are mostly inland and in the northern and central parts of the contiguous 48 states. Among the 25 cities, North Dakota has five, while Kansas and Nevada are home to three, including Las Vegas. The only cities on this list outside this region are Montpelier, Vermont, and Lubbock, Texas. Temperatures in the cities on the list were at least 5.2 degrees above their respective historical averages in September. In the hottest city, they were 7.8 degrees above historical average.

American cities with the most unusually warm temperatures this year | This list of U.S. cities that had far hotter temperatures in September than the historical average are mostly inland and in the northern and central parts of the contiguous 48 states. Among the 25 cities, North Dakota has five, while Kansas and Nevada are home to three, including Las Vegas. The only cities on this list outside this region are Montpelier, Vermont, and Lubbock, Texas. Temperatures in the cities on the list were at least 5.2 degrees above their respective historical averages in September. In the hottest city, they were 7.8 degrees above historical average. (<p>Tomwang112 / Getty Images</p>)

American cities with the most unusually warm temperatures in 2021

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To determine the 25 U.S. cities with the most unusually warm temperatures this year, 24/7 Tempo reviewed data on average temperatures in September from the National Centers for Environmental Information of the NOAA. Cities were ranked based on the highest difference in the average temperature in September 2021 from the historical average temperature for September from 1901 to 2000. Data on the hottest and coldest September months on record also came from the NCEI, with records dating back to 1895. Data for cities in Hawaii was not available. For similar lists visit 24/7 Wall St. .

American cities with the most unusually warm temperatures this year

American cities with the most unusually warm temperatures this year | This list of U.S. cities that had far hotter temperatures in September than the historical average are mostly inland and in the northern and central parts of the contiguous 48 states. Among the 25 cities, North Dakota has five, while Kansas and Nevada are home to three, including Las Vegas. The only cities on this list outside this region are Montpelier, Vermont, and Lubbock, Texas. Temperatures in the cities on the list were at least 5.2 degrees above their respective historical averages in September. In the hottest city, they were 7.8 degrees above historical average.

American cities with the most unusually warm temperatures this year | This list of U.S. cities that had far hotter temperatures in September than the historical average are mostly inland and in the northern and central parts of the contiguous 48 states. Among the 25 cities, North Dakota has five, while Kansas and Nevada are home to three, including Las Vegas. The only cities on this list outside this region are Montpelier, Vermont, and Lubbock, Texas. Temperatures in the cities on the list were at least 5.2 degrees above their respective historical averages in September. In the hottest city, they were 7.8 degrees above historical average. (<p>Tomwang112 / Getty Images</p>)

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25. Las Vegas, Nevada

25. Las Vegas, Nevada | Average temperature, September 2021: 86.3°F (5.2°F above average) - Average September temperature, 1901-2000: 81.1°F - Hottest September on record: 2018 (87.7°F) - Coldest September on record: 1965 (75.5°F)

25. Las Vegas, Nevada | Average temperature, September 2021: 86.3°F (5.2°F above average) - Average September temperature, 1901-2000: 81.1°F - Hottest September on record: 2018 (87.7°F) - Coldest September on record: 1965 (75.5°F) (<p>f11photo / iStock via Getty Images</p>)

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24. Rapid City, South Dakota

24. Rapid City, South Dakota | Average temperature, September 2021: 65.2°F (5.3°F above average) - Average September temperature, 1901-2000: 59.9°F - Hottest September on record: 1998 (67.2°F) - Coldest September on record: 1965 (48.3°F)

24. Rapid City, South Dakota | Average temperature, September 2021: 65.2°F (5.3°F above average) - Average September temperature, 1901-2000: 59.9°F - Hottest September on record: 1998 (67.2°F) - Coldest September on record: 1965 (48.3°F) (<p>DenisTangneyJr / iStock via Getty Images</p>)

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23. Des Moines, Iowa

23. Des Moines, Iowa | Average temperature, September 2021: 70.4°F (5.3°F above average) - Average September temperature, 1901-2000: 65.1°F - Hottest September on record: 2019 (71.6°F) - Coldest September on record: 1993 (59.4°F)

23. Des Moines, Iowa | Average temperature, September 2021: 70.4°F (5.3°F above average) - Average September temperature, 1901-2000: 65.1°F - Hottest September on record: 2019 (71.6°F) - Coldest September on record: 1993 (59.4°F) (<p>Davel5957 / iStock via Getty Images</p>)

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22. Milwaukee, Wisconsin

22. Milwaukee, Wisconsin | Average temperature, September 2021: 68.3°F (5.3°F above average) - Average September temperature, 1901-2000: 63.0°F - Hottest September on record: 2005 (69.9°F) - Coldest September on record: 1943 (58.4°F)

22. Milwaukee, Wisconsin | Average temperature, September 2021: 68.3°F (5.3°F above average) - Average September temperature, 1901-2000: 63.0°F - Hottest September on record: 2005 (69.9°F) - Coldest September on record: 1943 (58.4°F) (<p>Sean Pavone / iStock via Getty Images</p>)

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21. Topeka, Kansas

21. Topeka, Kansas | Average temperature, September 2021: 73.3°F (5.3°F above average) - Average September temperature, 1901-2000: 68.0°F - Hottest September on record: 2019 (76.2°F) - Coldest September on record: 1974 (61.5°F)

21. Topeka, Kansas | Average temperature, September 2021: 73.3°F (5.3°F above average) - Average September temperature, 1901-2000: 68.0°F - Hottest September on record: 2019 (76.2°F) - Coldest September on record: 1974 (61.5°F) (<p>DenisTangneyJr / iStock via Getty Images</p>)

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20. Lubbock, Texas

20. Lubbock, Texas | Average temperature, September 2021: 75.9°F (5.4°F above average) - Average September temperature, 1901-2000: 70.5°F - Hottest September on record: 2019 (77.5°F) - Coldest September on record: 1974 (62.7°F)

20. Lubbock, Texas | Average temperature, September 2021: 75.9°F (5.4°F above average) - Average September temperature, 1901-2000: 70.5°F - Hottest September on record: 2019 (77.5°F) - Coldest September on record: 1974 (62.7°F) (<p>DenisTangneyJr / E+ via Getty Images</p>)

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19. Minneapolis-St. Paul, Minnesota

19. Minneapolis-St. Paul, Minnesota | Average temperature, September 2021: 66.5°F (5.4°F above average) - Average September temperature, 1901-2000: 61.1°F - Hottest September on record: 2015 (67.9°F) - Coldest September on record: 1965 (53.5°F)

19. Minneapolis-St. Paul, Minnesota | Average temperature, September 2021: 66.5°F (5.4°F above average) - Average September temperature, 1901-2000: 61.1°F - Hottest September on record: 2015 (67.9°F) - Coldest September on record: 1965 (53.5°F) (<p>NNehring / iStock via Getty Images</p>)

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18. Pueblo, Colorado

18. Pueblo, Colorado | Average temperature, September 2021: 70.3°F (5.6°F above average) - Average September temperature, 1901-2000: 64.7°F - Hottest September on record: 2019 (72.8°F) - Coldest September on record: 1961 (59.1°F)

18. Pueblo, Colorado | Average temperature, September 2021: 70.3°F (5.6°F above average) - Average September temperature, 1901-2000: 64.7°F - Hottest September on record: 2019 (72.8°F) - Coldest September on record: 1961 (59.1°F) (<p>chapin31 / iStock Editorial via Getty Images</p>)

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17. Scottsbluff, Nebraska

17. Scottsbluff, Nebraska | Average temperature, September 2021: 67.5°F (5.6°F above average) - Average September temperature, 1901-2000: 61.9°F - Hottest September on record: 1998 (69.2°F) - Coldest September on record: 1912 (53.0°F)

17. Scottsbluff, Nebraska | Average temperature, September 2021: 67.5°F (5.6°F above average) - Average September temperature, 1901-2000: 61.9°F - Hottest September on record: 1998 (69.2°F) - Coldest September on record: 1912 (53.0°F) (<p>marekuliasz / iStock via Getty Images</p>)

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16. Reno, Nevada

16. Reno, Nevada | Average temperature, September 2021: 68.3°F (5.6°F above average) - Average September temperature, 1901-2000: 62.7°F - Hottest September on record: 2012 (70.4°F) - Coldest September on record: 1965 (56.1°F)

16. Reno, Nevada | Average temperature, September 2021: 68.3°F (5.6°F above average) - Average September temperature, 1901-2000: 62.7°F - Hottest September on record: 2012 (70.4°F) - Coldest September on record: 1965 (56.1°F) (<p>4kodiak / iStock via Getty Images</p>)

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15. Montpelier, Vermont

15. Montpelier, Vermont | Average temperature, September 2021: 61.1 °F (5.8°F above average) - Average September temperature, 1901-2000: 55.3°F - Hottest September on record: 1961 (63.1°F) - Coldest September on record: 1950 (50.8°F)

15. Montpelier, Vermont | Average temperature, September 2021: 61.1 °F (5.8°F above average) - Average September temperature, 1901-2000: 55.3°F - Hottest September on record: 1961 (63.1°F) - Coldest September on record: 1950 (50.8°F) (<p>haveseen / iStock via Getty Images</p>)

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14. Billings, Montana

14. Billings, Montana | Average temperature, September 2021: 65.2°F (5.8°F above average) - Average September temperature, 1901-2000: 59.4°F - Hottest September on record: 2009 (66.7°F) - Coldest September on record: 1965 (47.0°F)

14. Billings, Montana | Average temperature, September 2021: 65.2°F (5.8°F above average) - Average September temperature, 1901-2000: 59.4°F - Hottest September on record: 2009 (66.7°F) - Coldest September on record: 1965 (47.0°F) (<p>peeterv / iStock via Getty Images</p>)

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13. Sheridan, Wyoming

13. Sheridan, Wyoming | Average temperature, September 2021: 62.9°F (5.9°F above average) - Average September temperature, 1901-2000: 57.0°F - Hottest September on record: 1963 (64.3°F) - Coldest September on record: 1965 (47.2°F)

13. Sheridan, Wyoming | Average temperature, September 2021: 62.9°F (5.9°F above average) - Average September temperature, 1901-2000: 57.0°F - Hottest September on record: 1963 (64.3°F) - Coldest September on record: 1965 (47.2°F) (<p>DC_Colombia / iStock via Getty Images</p>)

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12. Wausau, Wisconsin

12. Wausau, Wisconsin | Average temperature, September 2021: 63.3°F (6.0°F above average) - Average September temperature, 1901-2000: 57.3°F - Hottest September on record: 2015 (64.9°F) - Coldest September on record: 1993 (52.0°F)

12. Wausau, Wisconsin | Average temperature, September 2021: 63.3°F (6.0°F above average) - Average September temperature, 1901-2000: 57.3°F - Hottest September on record: 2015 (64.9°F) - Coldest September on record: 1993 (52.0°F) (<p>Michael-Tatman / iStock via Getty Images</p>)

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11. Bismarck, North Dakota

11. Bismarck, North Dakota | Average temperature, September 2021: 65.1°F (6.2°F above average) - Average September temperature, 1901-2000: 58.9°F - Hottest September on record: 1948 (66.1°F) - Coldest September on record: 1965 (47.9°F)

11. Bismarck, North Dakota | Average temperature, September 2021: 65.1°F (6.2°F above average) - Average September temperature, 1901-2000: 58.9°F - Hottest September on record: 1948 (66.1°F) - Coldest September on record: 1965 (47.9°F) (<p>Nathan Livedalen / iStock via Getty Images</p>)

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10. Dodge City, Kansas

10. Dodge City, Kansas | Average temperature, September 2021: 74.7°F (6.2°F above average) - Average September temperature, 1901-2000: 68.5°F - Hottest September on record: 2019 (78.0°F) - Coldest September on record: 1974 (62.2°F)

10. Dodge City, Kansas | Average temperature, September 2021: 74.7°F (6.2°F above average) - Average September temperature, 1901-2000: 68.5°F - Hottest September on record: 2019 (78.0°F) - Coldest September on record: 1974 (62.2°F) (<p>raksyBH / iStock Editorial via Getty Images</p>)

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9. International Falls, Minnesota

9. International Falls, Minnesota | Average temperature, September 2021: 59.0°F (6.3°F above average) - Average September temperature, 1901-2000: 52.7°F - Hottest September on record: 2009 (60.1°F) - Coldest September on record: 1965 (45.6°F)

9. International Falls, Minnesota | Average temperature, September 2021: 59.0°F (6.3°F above average) - Average September temperature, 1901-2000: 52.7°F - Hottest September on record: 2009 (60.1°F) - Coldest September on record: 1965 (45.6°F) (<p><a href="https://www.flickr.com/photos/afiler/226476152/" target="_blank" rel="noopener">International Falls, Minnesota</a> (<a href="https://creativecommons.org/licenses/by-sa/2.0/" target="_blank" rel="noopener">CC BY-SA 2.0</a>) by <a href="https://www.flickr.com/people/afiler/" target="_blank" rel="noopener">Andrew Filer</a></p>)

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8. Cheyenne, Wyoming

8. Cheyenne, Wyoming | Average temperature, September 2021: 63.5°F (6.6°F above average) - Average September temperature, 1901-2000: 56.9°F - Hottest September on record: 2015 (64.7°F) - Coldest September on record: 1912 (48.0°F)

8. Cheyenne, Wyoming | Average temperature, September 2021: 63.5°F (6.6°F above average) - Average September temperature, 1901-2000: 56.9°F - Hottest September on record: 2015 (64.7°F) - Coldest September on record: 1912 (48.0°F) (<p>DenisTangneyJr / E+ via Getty Images</p>)

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7. Minot, North Dakota

7. Minot, North Dakota | Average temperature, September 2021: 65.0°F (6.8°F above average) - Average September temperature, 1901-2000: 58.2°F - Hottest September on record: 2009 (66.1°F) - Coldest September on record: 1965 (47.1°F)

7. Minot, North Dakota | Average temperature, September 2021: 65.0°F (6.8°F above average) - Average September temperature, 1901-2000: 58.2°F - Hottest September on record: 2009 (66.1°F) - Coldest September on record: 1965 (47.1°F) (<p><a href="https://www.flickr.com/photos/afiler/2660103523/" target="_blank" rel="noopener">Minot, North Dakota</a> (<a href="https://creativecommons.org/licenses/by-sa/2.0/" target="_blank" rel="noopener">CC BY-SA 2.0</a>) by <a href="https://www.flickr.com/people/afiler/" target="_blank" rel="noopener">Andrew Filer</a></p>)

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6. Carson City, Nevada

6. Carson City, Nevada | Average temperature, September 2021: 70.2°F (6.8°F above average) - Average September temperature, 1901-2000: 63.4°F - Hottest September on record: 2012 (70.7°F) - Coldest September on record: 1965 (57.1°F)

6. Carson City, Nevada | Average temperature, September 2021: 70.2°F (6.8°F above average) - Average September temperature, 1901-2000: 63.4°F - Hottest September on record: 2012 (70.7°F) - Coldest September on record: 1965 (57.1°F) (<p>Bill_Dally / iStock via Getty Images</p>)

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5. Fargo, North Dakota

5. Fargo, North Dakota | Average temperature, September 2021: 64.4°F (6.8°F above average) - Average September temperature, 1901-2000: 57.6°F - Hottest September on record: 2015 (65.1°F) - Coldest September on record: 1965 (48.8°F)

5. Fargo, North Dakota | Average temperature, September 2021: 64.4°F (6.8°F above average) - Average September temperature, 1901-2000: 57.6°F - Hottest September on record: 2015 (65.1°F) - Coldest September on record: 1965 (48.8°F) (<p>DenisTangneyJr / iStock Unreleased via Getty Images</p>)

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4. Dickinson, North Dakota

4. Dickinson, North Dakota | Average temperature, September 2021: 63.6°F (6.9°F above average) - Average September temperature, 1901-2000: 56.7°F - Hottest September on record: 1998 (63.9°F) - Coldest September on record: 1965 (44.6°F)

4. Dickinson, North Dakota | Average temperature, September 2021: 63.6°F (6.9°F above average) - Average September temperature, 1901-2000: 56.7°F - Hottest September on record: 1998 (63.9°F) - Coldest September on record: 1965 (44.6°F) (<p><a href="https://www.flickr.com/photos/afiler/2570995482/" target="_blank" rel="noopener">Dickinson, North Dakota</a> (<a href="https://creativecommons.org/licenses/by-sa/2.0/" target="_blank" rel="noopener">CC BY-SA 2.0</a>) by <a href="https://www.flickr.com/people/afiler/" target="_blank" rel="noopener">Andrew Filer</a></p>)

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3. Colorado Springs, Colorado

3. Colorado Springs, Colorado | Average temperature, September 2021: 68.0°F (7.2°F above average) - Average September temperature, 1901-2000: 60.8°F - Hottest September on record: 2019 (68.7°F) - Coldest September on record: 1961 (54.3°F)

3. Colorado Springs, Colorado | Average temperature, September 2021: 68.0°F (7.2°F above average) - Average September temperature, 1901-2000: 60.8°F - Hottest September on record: 2019 (68.7°F) - Coldest September on record: 1961 (54.3°F) (<p>Jacob Boomsma / iStock via Getty Images</p>)

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2. Goodland, Kansas

2. Goodland, Kansas | Average temperature, September 2021: 71.4°F (7.2°F above average) - Average September temperature, 1901-2000: 64.2°F - Hottest September on record: 2021 (71.4°F) - Coldest September on record: 1965 (55.3°F)

2. Goodland, Kansas | Average temperature, September 2021: 71.4°F (7.2°F above average) - Average September temperature, 1901-2000: 64.2°F - Hottest September on record: 2021 (71.4°F) - Coldest September on record: 1965 (55.3°F) (<p><a href="https://www.flickr.com/photos/marypmadigan/6000748434/" target="_blank" rel="noopener">Goodland, Kansas</a> (<a href="https://creativecommons.org/licenses/by/2.0/" target="_blank" rel="noopener">CC BY 2.0</a>) by <a href="https://www.flickr.com/people/marypmadigan/" target="_blank" rel="noopener">Mary Madigan</a></p>)

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1. Grand Forks, North Dakota

1. Grand Forks, North Dakota | Average temperature, September 2021: 63.0°F (7.8°F above average) - Average September temperature, 1901-2000: 55.2°F - Hottest September on record: 2009 (64.1°F) - Coldest September on record: 1965 (45.8°F)

1. Grand Forks, North Dakota | Average temperature, September 2021: 63.0°F (7.8°F above average) - Average September temperature, 1901-2000: 55.2°F - Hottest September on record: 2009 (64.1°F) - Coldest September on record: 1965 (45.8°F) (<p>DenisTangneyJr / iStock via Getty Images</p>)

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