Though dew point and relative humidity are tools used in prognostications of weather and also to express the amount of moisture in the air, they are actually different. Dew point is widely regarded as a highly recommended tool for forecasting rain and the probability of thunderstorms. This occurs according to when the temperature at actual vapour pressure and the saturation vapour pressure is equal. Dew point temperature is the temperature at which the water vapour presented in the air condenses into water droplets or dew at constant air pressure. The dew point temperature of the water vapour is the temperature at which the water vapour in the air begins to evaporate or condense simultaneously at the same rate. Great importance has been given to dew point due to the fact that it is seen as the measure of the state of the atmosphere in as much that it tells how much water vapour is present in it. Relative humidity is known to be a function of temperature and absolute concentration of water vapour. Its effect is also seen in the area of biosphere and surface hydrology. Atmospheric humidity is known to be a very important element in determining the geographical distribution of precipitation and its peak intensity. It also plays a prominent role in the formation of fog, clouds and smog. Relative humidity (RH) can be described as the amount of water vapour in an air sample, which directly affects the visibility of the atmosphere. Hence, monitoring of the changes in the atmospheric water vapour content as a means of validating the large water vapour feedback of the various climatic models and as a result of global warming becomes imperative. The water vapour in the atmosphere is expected to increase due to global warming, thereby leading to significantly high anthropogenic sources in Climate change. The corresponding large amount of energy needed as water changes from one (gaseous or liquid or solid) phase to another, together with its role as a greenhouse gas, makes Atmospheric water vapour very important in Earth’s weather and climate. One of the most important determinants of the state of the Weather and Climate of the Earth is the Atmospheric water vapour. The knowledge of the prevailing conditions of the atmosphere of a place helps in the study of the weather of the place. It is a known fact that almost all area of human endeavours is affected by the weather.
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