Explanation:

 Jaisalmer, being an arid desert region, is prone to extremes in terms of temperature. The temperature varies greatly from day to night in both summer and winter. The maximum summer temperature is around 49 °C (120 °F) while the minimum is 25 °C (77 °F). The maximum winter temperature is usually around 23.6 °C (74.5 °F) and the minimum is 5 °C (41 °F). 

Water is scarce, and generally brackish; the average depth of the wells is said to be about 250 feet (76 m). There are no perennial streams, and only one small river, the Kakni. The climate is dry. Throughout Jaisalmer only raincrops, such as bajra, jawar, motif, til, etc., are grown; spring crops of wheat, barley, etc., are very rare.