Rainfall decreases as winds move westwards up the Ganga Plains. Rajasthan receives very little rain as it lies in the rain-shadow of the Aravali Hills. The climate of Rajasthan varies greatly throughout the state. It is very hot and dry in summer in the desert areas, where dust storms also occur, while it is very cold during the winters. To the west of the Aravali range, the weather is characterized by low rainfall with erratic distribution, extremes of diurnal and an- nual temperatures, low humidity and high wind ve- locity. While in the east of the Aravali range, the weath- er is characterized by relatively low wind velocity and high humidity with better rainfall.

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3) zero (0) degree Longitude is the mean longitude and the time adjusted according to this longitudinal time. The earth rotates from West to East. So every 15 o we go easy wards, local time is advanced by 1 hour. If we go west wards, local time is retarded by 1 hour. Each country has set their local time multi- ple of half an hour (1/2 hour). India’s local standard time is (+5.5 h). Means 5.5 h ahead of G.M.T.

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