What does the weather forecast of the Central Meteorological Observatory mean when the precipitation is 0.3mm at 8: 00 a.m.?

Precipitation (or water volume after snow melting) is the depth of precipitation accumulated on the horizontal plane in a certain period of time.

From 7: 00 to 8: 00 this morning, the measured precipitation depth was 0.3 mm, which is the hourly precipitation. In addition to hourly precipitation, there are 6 hours of precipitation, 12 hours of precipitation, 24 hours of precipitation and so on.