Typhoon Tip was the largest tropical cyclone on record , with a diameter of 1,380 mi ( 2,220 km ) . This is almost double the previous record of 700 miles ( 1,130 km ) set by Typhoon Marge in August of 1951 . Typhoon Tip was the largest tropical cyclone on record , with a diameter of 1,380 mi ( 2,220 km ) â '' almost double the previous record of 700 miles ( 1,130 km ) set by Typhoon Marge in August 1951 .