Every region of the Earth’s surface is subjected to a particular climate. This climatemight be considered to comprise the yearly average weather, including such factors asrainfall, wind, temperature, hours of sunshine and so forth. In most parts of the Earthnone of these factors is constant throughout the year. Thus, in the case of rainfall thismay be defined as annual rainfall, seasonal rainfall (the amount in spring, summer,autumn and winter), monthly rainfall or even rainfall intensity.