Samburu County experiences a semi-arid climate reflecting its location in Kenya's pastoral belt. Rainfall is the primary climatic concern, as water availability shapes all aspects of human settlement and livestock production.
Annual rainfall averages approximately 400,600 millimeters, with significant variation between areas and years. Highland areas around Maralal receive higher rainfall than lowland pastoral zones. This variability reflects topographic variation and distance from moisture-bearing wind patterns.
Rainfall is highly seasonal and unreliable, with significant year-to-year variation creating adaptation challenges. Long rains typically occur between March and May. Short rains fall between October and December. Failure of either rainy season creates hardship for pastoral communities.
Temperatures are warm to hot year-round, with average daily maxima often exceeding 25 degrees Celsius in lower areas. Maralal's elevation creates cooler conditions than surrounding regions. Diurnal temperature variation can be substantial, with cool nights and warm days.
Evaporation rates are high, making water retention and storage challenging. River flows decrease significantly during dry seasons. The Ewaso Nyiro River maintains permanent flow through dry periods, but water levels fluctuate seasonally.
Drought represents the most significant climatic threat. Multi-year droughts (1984,1985 and 2010,2011 and ongoing conditions in recent years) devastate pastoral production as livestock die and pasture and water disappear.
Climate variability affects water availability through its impact on rainfall. Seasonal water availability shapes pastoral movement and settlement patterns. Perennial water sources remain limited and concentrated.
Climate change is intensifying precipitation variability and increasing aridity. Scientific projections suggest continued warming and potential rainfall reduction in northern Kenya, with significant implications for pastoral production and food security.
See Also
Sources
- Kenya Meteorological Department: Climate Records and Analysis, Northern Kenya. https://www.meteo.go.ke/
- IPCC: Climate Change Impact Assessment for East Africa. https://www.ipcc.ch/
- CARE International: Climate Variability and Pastoralism in Northern Kenya. https://www.care.org/