Rain day A rain day occurs when a daily rainfall of at least 0.2 mm is recorded. The total liquid product of precipitation or condensation from the atmosphere, as received and measured in a rain gauge. A climatological station, the data of which are intended for the purpose of determining climatic trends.
Relative humidity Is a traditional indicator of the air's moisture content.
It is the ratio of the amount of moisture actually in the air to the maximum amount of moisture which the air could hold at the same temperature. The air can hold more moisture at higher temperatures, hence the relative humidity alone does not give an absolute measure of moisture content. Users of these web pages are deemed to have read and accepted the conditions described in the Copyright Notice and Disclaimer .