VARIABILITY AND TRENDS OF OBSERVED MINIMUM, MAXIMUM AND AVERAGE TEMPERATURE OVER NORTHWESTERN PARTS OF ETHIOPIA SINCE 1987Belay Ejigu Feke, Tadesse Terefe Kassahun Ture and Debela Hunde
This study examined the Spatio-temporal variability and time-series trends of 33 yearsâ temperature ranging from 1987 to 2019. Dataset for statistical analysis obtained from the national meteorological agency and national aeronautics and space administration data portal. All statistical examinations were conducted using Python3. There was a non-significant difference between the months of the years 1987 to 2016 and 1987 to 2019. A less variable annual minimum temperature observed over the period with the lowest record of 16.341 oC and maximum-minimum temperature of 17.45 oC. Significantly different monthly maximum temperatures recorded over the period from 1987 to 2016 and from 1987 to 2019. There was a statistically a non-significant difference (P>0.05) between the winter, spring, summer, autumn, belg, kiremt and bega seasons over the periods of 30 and 33 years. Statistically significant (P<0.05) differences evaluated among the months of the year ranging from 1987 to 2016 and 1987 to 2019 in the observed average temperature. Increasing of average temperature valued during all months of the year 1987 to 2016. Growing trends in average temperature during all months of the period from 1987 to 2019 observed. There was a non-significant difference in observed average temperature during the winter, spring, summer and autumn seasons. There was statistically non-significant variation in average temperature among the Belg, Kiremt and Bega seasons during the period of the last 30 and 33 years. Increasing annual and decadal average temperature was observed over the series of years within the range of 30 and 33 years.