amount of precipitation before it registers

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hello, i'm writing with the hope that someone will be able to help me. i am trying to obtain some historical weather data and i am wondering if there is a certain amount of rain that has to fall before it registers on a weather station ???? many thanks in advance Karen
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Posted 2 years ago

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Ingemar Skarpås

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Depends on how your  weather station measures rain/precipitation. If for example it uses bowls that tip when they are full - then that amount of the cup sizes is needed to trigger a new value. It can be f ex 0.1 inch (0.25 mm) of precipitation before it triggers. However, that is not always eaxct. The station with the balancing cups on the 'scale' need to be exactly level! Also, you may already have had old precipitation in the bowls/cups, and then less rain triggers a new value. F ex in the summer the bowl may have been almost completely full, but not tipped - Then warm weather makes all that or parts of that old rain vaporize.  Usually you can find out what type of measuring system you have, and how small steps needed to trigger a neww value - from the manual. So, have a look, or tell people here what make/model you have and they could perhaps tell you.