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Weather Summary for the year 1980 - Definitions

Please Note the following definitions and conventions


Quoted in degrees Celsius.

Strong wind:

A mean wind speed of 22 to 33 Knots.

Gale force wind:

A mean wind speed of 34 Knots or more.


Bright sunshine is recorded when the sun is above the horizon and is not obscured by cloud, drift etc.

Drifting snow:

Recorded when snow lifted from the surface by wind reduces the visibility to 1000 Metres or less.


Recorded when a gale force wind persisting for one hour or more, with the temperature less than zero degrees and the air is laden with snow, some part at least which has been raised from the surface, reduces the visibility to 100 Metres or less.


Produced by the Meteorological
department Mawson courtesy of
Weather, Shep and Nobby.