The use of ultrasonic anemometers under cloudy weather conditions is often
doubted, even rejected or not discussed in the literature. To investigate t
he influence of liquid water content on the behaviour of sonic anemometers
a small intercomparison experiment using an ultrasonic anemometer, a fast r
esponse propeller anemometer, and a Particulate Volume Monitor was performe
d at the German Environmental Research Station `Schneefernerhaus' near the
top of Mt. Zugspitze. The results obtained under different conditions (dry/
cloudy) give no significant hint on such an influence.