Abstract
The author made a local climatological observation on humidity distribution at Uchihara, Iberagi Pref.. There is a flat diluvial plateau surface dotted with forests, paddy fields and upland fields. He studied effects of such surface covers on the distributions of humidity in daytime in late summer.
1) In mobile observation, unavoidable errors are caused by microfluctuations of atmospheric conditions and by assuming that the time change is the same at every place in the whole area, but these two kinds of errors do not seem to exceed ±2 %.
2) In oiler to lessen the latter errors, he made a new attempt of repeated ob ervations at the same place at different times. He got a revised time series of the reduction terms.
3) Humidity differences between various sorts of surface covers reached 5-10%. The most humid areas were forests and paddy fields. Upland fields were less humid, and barelands and grasslands were still drier.
