20. The 2009 Christmas Blizzard
> Duration: Dec. 22, 2009 – Dec. 29, 2009
> Region: Northern Rockies and Plains
> Affected area: 466,690 square miles
> Population affected: 4.8 million
> Notable snowfall: 15.7 inches (Osceola, NE)
19. The Blizzard of 1966
> Duration: Feb. 28, 1966 – Mar. 6, 1966
> Region: Northern Rockies and Plains
> Affected area: 466,796 square miles
> Population affected: 4.8 million
> Notable snowfall: 30.5 inches (Devils Lake, ND)
18. The Blizzard of 1920
> Duration: Apr. 15, 1920 – Apr. 19, 1920
> Region: Northern Rockies and Plains
> Affected area: 350,813 square miles
> Population affected: 2.4 million
> Notable snowfall: 28.3 inches (Denver, CO)
17. The Historic Texas Snowstorm
> Duration: Dec. 19, 1929 – Dec. 24, 1929
> Region: South
> Affected area: 380,488 square miles
> Population affected: 31.2 million
> Notable snowfall: 26 inches (Hillsboro, TX)
16. The Blizzard of 1943
> Duration: Jan. 19, 1943 – Jan. 26, 1943
> Region: Northern Rockies and Plains
> Affected area: 358,424 square miles
> Population affected: 3.1 million
> Notable snowfall: 14.4 inches (Portland, OR)