Kisii County experiences a highland climate characterized by relatively cool temperatures, high rainfall, and favorable agricultural conditions. The bimodal rainfall pattern (two rainy seasons) strongly influences agricultural cycles and economic activities.
Climate Type
Kisii's highland location (approximately 1,500 to 2,000 meters above sea level) creates:
- Cool temperatures year-round
- Mean annual temperature approximately 16 to 18 degrees Celsius
- Low temperature variability between seasons
- Frequent cloud cover and mist
- Relatively humid conditions
The cool climate creates favorable conditions for tea cultivation and other highland crops.
Rainfall Pattern
Bimodal rainfall includes:
- Long rains from March to May (primary rainy season)
- Short rains from October to November (secondary rainy season)
- Mean annual rainfall of 1,800 to 2,000 millimeters
- Rainfall concentrated in the rainy seasons with dry periods between
- Year-round water availability from rainfall
The reliable bimodal rainfall pattern contrasts with drier regions and supports intensive agriculture.
See Also
Agricultural Implications
Climate conditions enable:
- Tea cultivation requiring consistent rainfall and cool temperatures
- Multiple crop harvests annually
- Year-round pasture for dairy cattle
- Diverse crop production systems
- Relatively predictable agricultural seasons
Rainfall Variability and Climate Change
Increasing climate variability manifests through:
- Delayed onset of rains affecting planting schedules
- Erratic rainfall patterns within rainy seasons
- Occasional droughts during expected rainy periods
- Increased rainfall intensity causing soil erosion
- Shifting planting seasons and crop calendars
Water Resources
Water availability from rainfall supports:
- River systems including permanent water sources
- Groundwater resources (though not extensively mapped)
- Community water schemes and government water projects
- Hydroelectric potential in some locations
- Ecological water needs for forests and natural systems
Climate and Disaster Risk
Climate-related disasters include:
- Occasional flooding in river valleys
- Soil erosion during heavy rainfall
- Limited drought events compared to drier regions
- Landslides in steep terrain during extreme rainfall
- Health implications of high rainfall (malaria)
Climate Change Adaptation
Farmers are adapting through:
- Crop diversification reducing rainfall dependence
- Water harvesting and conservation techniques
- Soil conservation preventing erosion
- Early warning systems for extreme weather
- Improved weather forecasting access
Sources
- Kenya Meteorological Department (2023). "Climate Profile: Kisii County". https://www.meteo.go.ke
- World Bank (2021). "Climate Risk Country Profile: Kenya". https://www.worldbank.org
- FAO (2022). "Climate Smart Agriculture in East Africa". https://www.fao.org