Rain, drizzle, freezing rain, freezing drizzle and hail are usually measured using the standard Canadian rain gauge, a cylindrical container 40 cm high and 11.3 cm in diameter. The precipitation is fu
nneled into a plastic graduate that serves as the measuring device. Snowfall is the measured depth of newly fallen snow, measured using a snow ruler. Measurements are made at several points which appear representative of the immediate area, and then averaged. 'Precipitation' in Canadian Climate Normals tables is the water equivalent of all types of precipitation.
Instrument for measuring the depth of water from precipitation supposedly distributed over a horizontal impervious surface and not subject to evaporation.
A device that surrounds a rain gauge and acts to maintain horizontal flow in the vicinity of the funnel so that the catch will not be influenced by eddies generated near the gauge. (Also called wind s
hield.) Types in use include the Alter shield, Nipher shield, and Wild fence.