Abstract
The relations between humidity and other meteorological elements are investigated and the results are summarized as follows.
(1) The air is dry when the weather is fine while it is wet when the weather is bad. The mean value of humidity is 66% for fine, 77%. for cloudy, 90% for rainy weather respectively.
(2) The humidity becomes small when the wind becomes strong and gusty.
(3) The humidity is large on the sea.
(4) Hence, we can easily predict the humidity by predicting the weather and the wind.
(5) The vapour tension of air is fairly conservative, hence it is easily predicted.
(6) Calculating the transfer of heat and vapour in the atmosphere, the above results can be proved theoretically.
