Abstract

This study assessed actual rainfall trends and variability in Baringo County. The objective of the study was to determine whether there were variations in rainfall trends by agro ecological zones. Meteorological rainfall data for the period 1981 to 2010 from three distinct agro-ecological zones covering highland (LH 2), low land (IL 6) and midland (LM 5) was used. The choice of rainfall stations was informed by agro-ecological zones and percentage of missing data. Data were analyzed on annual and monthly basis. Trend analysis and coefficient of variation was used to analyze actual trends and rainfall variability. Trend analysis showed year to year variability in rainfall. The trends were by agro-ecological zones. Annual rainfall in LM5 and IL6 showed decreasing trends while in LH2, it showed increasing trend. IL6 and LH2 exhibits a very high coefficient of variation for annual rainfall (CV > 30%), indicating high rainfall variability. Increasing awareness of climate variability and development of mitigation options will be necessary response strategies in Baringo County.

Key words: Rainfall trends, rainfall variability, trend analysis, Baringo County.