Place a mm gauge glass graduated cylinder in the outer container to prevent evaporation and collect rainwater.
Most modern rain gauges generally measure precipitation collected over a period of time in millimetres. This corresponds to litres per square meter. Previously, rain was recorded in inches or points, where a point was 0.254 mm or 0.01 inch.
Rainfall is read manually or by an automatic weather station (AWS). The frequency of readings depends on the research agency’s requirements. Some countries augment paid weather watchers with networks of volunteers to get precipitation data (and other types of weather) for sparsely populated areas.
In most cases, no precipitation data is kept, but some observatories submit precipitation and snowfall for testing to determine pollution levels.
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