Published Paper Details:

The daily rainfall data for the period of 39 years (1980-2018) were collected from the National Data Center (NDC), India Meteorological Department (IMD), Pune, India for Hisar (Haryana) situated in semi-arid zone of North India. Every year, the region faces adverse effects of moisture deficiency. Generally, potential evapotranspiration requirements exceed the rainfall during eight months in a year except the monsoon season (June-September). The data were processed and analyzed to establish the long term averages of rainfall and variability on weekly, monthly, seasonal and annual basis. Different descriptive statistics techniques like mean, standard deviation (SD) and coefficient of variation (CV) were carried out. During the study period, the rainfall data showed that the annual daily rainfall received ranged between 257.5 mm (minimum) in 1997 to 691.6 mm (maximum) in 1988 indicating a very large range of fluctuation. The normal annual rainfall at Hisar was 411.1 mm with SD of 114.8 and CV of 27.9 %. The normal annual rainy day and crop day was 28 and 20.2 days with SD of 5 and 4.4 and CV of 17.8 and 20.2 %. July received maximum normal rainfall of 109.5 mm followed by August (90.2 mm). The stable rainfall period was of 16 weeks, which spread over 24th to 39th standard meteorological weeks (SMW). During South West (SW) monsoon season (June to September), seasonal normal rainfall was 275 mm which contributed 75 per cent to the total annual normal rainfall with a coefficient of variation of 44.4 per cent.