The Punjab-Haryana Plain has a monsoon type climate, with dry cold winters and hot summers. The climate is characterized by extreme hot and extreme cold conditions. Annual temperature in the plain ranges from 2oC to 40oC. May and June are characterized by hot and dry winds, locally known as 'loo'. These 'loo' are following by dust winds and occasional showers. Rainfall decreased from about 950mm near the Shiwalik range to 330mm along the Rajasthan desert. The annual rainfall varies from 950mm. in Ambala to 460mm in Hissar. Most of the rainfall occurs in the months of July to September. Some amount of rainfall is received in winter between December and March because of western depressions. It roves useful for Rabi crops.