Vol. 7, Issue 1 (2019)

The historical daily data of rainfall and temperature were collected for the period of last 30 years (1985-2015) for the various extreme weather events viz, Dry spell, Wet spell, Heat waves, Cold waves, and frost as to identify the impact of various extreme weather events. Based on the historical data results reveal that. In EPZ of U.P, the dry spell showed an increasing trend in recent years. The wet spell of 10mm for 7 days, 25mm for 3 days showed decreasing trend in recent years. S-W monsoon rainfall of EPZ of UP declined over the normal in recent years. Maximum days of heat waves were recorded in May (1.6 days) followed by June (1.5days).During the month of September there was no any heat waves, while during the month of March followed by August recorded lowest frequency of heat waves. Maximum days of cold waves (1.6 days) were recorded during the month of January followed by February and December month. The month of October and March have no cold wave in EPZ of U.P. The trend of extreme minimum temperature and extreme maximum temperature showed decreasing trend against the normal value of 30C and 440C respectively.

The number of frost events increased from 29 days to 57 days, against the normal of 44 days. The total increasing trend of frost occurrence over the decades in the area will force to make strategy on contingent plan for major crops and adoptive measures from frost protection as to harvest highest genetic potential yield. Probability % of maximum frost occurrence during the month of January showed the decreasing trend of variation from 69% (1986-1995), 85% (1996-2005) and 63% (2005-2015) over the normal value of 72 %. Frost occurrence in the month of Dec- Jan will coincides with active tuber bulking phase in potato its effect is to bring about yield losses, and frost, foggy weather in winter months and occasional rains favours the late blight disease of potato in this region. So the decreasing tendency of frost days in January month in recent decades have beneficial impact on the growth of rabi crops in the region.