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SECTION 3. TEMPERATURE

1. Temperature Distribution
Two temperature scales are commonly used in communicating weather information--
Fahrenheit (F) and Celsius/centigrade (C). The freezing point of water is 32° on the Fahrenheit
scale (32°F) and zero on the Celsius scale (0°C). Water boils at 212°F, or 100°C when it is at
sea level.

2. Lapse Rate
Temperature normally decreases with increasing altitude in the lower 30 to 40 thousand feet
of the atmosphere. This decrease in temperature with an increase in height is defined as the
lapse rate. A standard lapse rate is approximately 2°C per thousand feet.

3. Inversion/Inversion Layer

An inversion is an abnormal increase of the temperature of the atmosphere with height.
An inversion layer is a layer of air that shows inversion characteristics.

4. Isothermal Layer
An isothermal layer is a layer in which temperature does not change with height.