Ice accretion indicator

The ice accretion indicator is an L-shaped piece of aluminium 38 cm (15 in) long by 4 to 5 cm (1.6 to 2.0 in) wide. It is used to indicate the formation of ice, frost or the presence of freezing rain or freezing drizzle.

It is normally attached to a Stevenson screen, about 1 m (3 ft 3 in) above ground, but may be mounted in other areas away from any artificial heat sources. The weather station would have two on site and they would be exchanged after every weather observation. The spare indicator should always be at the outside air temperature to ensure that it is ready for use and would normally be stored inside the screen.