How to measure rainfall manually?

In rainfed farming conditions, the Food and Agriculture Organization of the United Nations (FAO) recommends that farmers sow only when the rainfall is appropriate, i.e. exceeds 30 mm (FAO, 1979). While weather reports are now more reliable and frequently updated, the increasing unpredictability as result of climate change poses challenges to hydro-meteorological forecasts, especially those for an entire season. Hence, farmers need to ascertain actual rainfall in their living and farming area to plan a successful crop season effectively. Implementing a straightforward measurement method can verify actual rainfall, supplementing the estimates based on the field experience of farmers and local agricultural extension officers.