Although many people perceive a monsoon as having a torrential downpour of rain, the correct, technical definition of a monsoon is that it is a seasonal reversal of wind flow. This seasonal reversal results from the differential heating and cooling of land and water that creates seasonal changes in heating and cooling conditions and thus seasonal changes in land and water pressure conditions. For example, in South Asia, the summer monsoon is indeed a very wet monsoon, but the winter monsoon in this region is desert like. Land and sea breezes are caused by the same differential heating and cooling of land and water, but on a local scale along a coastal area and on a day and night basis rather than a seasonal basis. Warmer air is capable of holding more moisture than cooler air.
Relative humidity is indirectly or negatively related to temperature.
Assuming a constant actual amount of water vapor, as temperature increases, relative humidity decreases. As temperature decreases, assuming a constant actual amount of water vapor, relative humidity increases. The temperature at which this condition occurs is known as the condensation or dew or saturation point. The process of condensation can only begin at this point. When air is cooled below this point, the air becomes oversaturated and precipitation results.