Climate statistics for Australian locations

Definitions for other daily elements

Instruments

Sunshine

Campbell-Stokes sunshine recorder

Campbell-Stokes recorder

This instrument uses a spherical glass lens to focus the image of the sun on to a specially designed card, which is scorched when the sunlight intensity exceeds a pre-determined threshold. The total length of the burn trace is proportional to the number of hours when the sunshine was sufficiently bright to burn the card.

Evaporation

Class A evaporation pan

Class A Evaporation pan and
wind run anemometer

Water level is reset daily to a fixed depth by adding water to the pan or by removing water following significant rainfall. The change in depth, allowing for rainfall, is the daily evaporation.

Related Links

  • This page URL: http://www.bom.gov.au/climate/cdo/about/definitionsother.shtml
  • About climate averages: http://www.bom.gov.au/climate/cdo/about/about-stats.shtml
  • Climate averages home page URL:  http://www.bom.gov.au/climate/data/index.shtml
  • Bureau of Meteorology website:  http://www.bom.gov.au