In troposphere (the weather domain), the temperature 't' at height 'h' above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)

• t = 15 - 0.0065h
• t = 15 + 0.0065h
• t = 0.0035h -15
• t = 15 - 0.0035h