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A degree of latitude is 60 nautical miles, or 69.04 statute miles. A minute of latitude is equal to one nautical mile, or 6076 feet; thus, a second of latitude (6076 divided by 60) is 101 feet, 3 inches. Conceptually and practically, latitude is the same no matter where you go on earth; however, in reality it varies from 69.41 statute miles per minute at the poles to 68.70 statute miles per minute at the equator due to the earth bulging slightly from its rotational spin.
Longitude, of course, varies in length according to degree of latitude. The following is a sampling of longitude lengths for selected latitudes, beginning in the southern US and working north.
30 degrees North, (approximately Houston, Texas) a degree of longitude is 59.96 statute miles, 5274 feet per minute (almost equal to a statute mile), 88 feet per second.
35 degrees North, (approximately Albuquerque, New Mexico) a degree of longitude is 56.73 statute miles, 4992 feet per minute, 83.2 feet per second.
40 degrees North, (Kansas/Nebraska border), a degree of longitude is 53.06 statute miles, 4669 feet per minute, 77.8 feet per second.
45 degrees North, (Montana/Wyoming border), a degree of longitude is 49.00 statute miles, 4312 feet per minute, 71.87 feet per second.
49 degrees North (US/Canada national boundary), a degree of longitude is 45.40 statute miles, 3995 feet per minute, 66.59 feet per second.
50 degrees North (approximately Powell River, BC, Medicine Hat, Alberta, and Winnipeg, Manitoba), a minute of longitude is 44.55 statue miles, 3920 feet (1195 meters) per minute, 65.34 feet (19.9 meters) per second.
55 degrees North (approximately Ketchikan, Alaska and Dawson Creek, BC) a degree of longitude is 39.77 statute miles, 3500 feet (1066.8 meters) per minute, 58.33 (17.78 meters) per second.
Finally, 60 degrees North (southern border of the Northwest Territories), a degree of longitude is 34.67 statute miles, 3051 feet (930 meters) per minute, 50.85 feet (15.5 meters) per second.
Whew! (grin) Had enough? I know I have! Hope this helps.
Best regards,
Senty
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Latitude-Longitude Conversion to Feet 
Navigational question
(Phil Nunan)
