PRESSURE	APPROX.HEIGHT	APPROX. TEMP.
Sea level	0 m or 0 ft	15C or 59F
1000 mb	100 m or 300 ft	15C or 59F
850 mb	1500 m or 5000 ft	5C or 41F
700 mb	3000 m or 10000 ft	-5C or 23F
500 mb	5000 m or 18000 ft	-20C or -4F
300 mb	9000 m or 30000 ft	-45C or -49F
200 mb	12000 m or 40000 ft	-55C or -67F
100 mb	16000 m or 53000 ft	-56C or -69F