A rain gauge
Mount your wind speed indicator in a place that is exposed to the wind from all directions. 4 A rain gauge It is simple to make a easy rain gauge using a funnel and bottle, with a measuring cylinder to calculate the volume of water.
The funnel should have either a very sharp vertical edge, or a horizontal lip to stop raindrops bouncing out again. The entire apparatus should be buried so that the funnel is a small centimetres above ground level.