Spatial and Temporal Rainfall Trend Analysis: at Abrehamo woreda in Assosa Zone, Benishangul Gumez Region, Ethiopia

The main aim of this paper was to investigate the trend and variability of seasonal and annual rainfall data over western Ethiopia in Bineshungul region at abrehamo woreda since 2009- 2020.according to this assessment Abrehamo has monomodal season or single maxima and amount of rainfall is show decreasing trend year to year. Mean annual rainfall of at that station is 1458.2mm and annual standard deviation is 184.8 .us result of coefficient of variance annually has less variable and in season highly variability without kiremt season. The mean annual rainfall coefficient of rainfall indicated less to high rainfall variability. Rainy season of in this area include last month belg and first month baga that means May-October. Belg and Bega Season of study area is respect high variation the range of coefficient of variance is >0.3. Kiremt and annual coefficient of variance range is <0.2 it is less variability.