Kericho, the highland town at the heart of Kenya’s tea-growing region, is one of the hailiest places in the country—a distinction shaped by its high elevation, position on the edge of the Mau Forest, and the intense afternoon convection typical of equatorial highland climates. Understanding why hail forms so readily here helps explain both the region’s lush tea landscapes and the recurring damage local farmers report during the rainy season.
A High-Altitude Location Sets the Stage
Kericho sits at roughly 2,000 meters (about 6,500 feet) above sea level in the highlands west of the Kenyan Rift Valley, on the edge of the Mau Forest—the largest water catchment area in Kenya. This elevation places the town in cooler, moisture-laden air even though it sits almost on the equator, and that combination of tropical heat at ground level with cooler air aloft is a classic recipe for the kind of powerful vertical air movement that produces hail rather than ordinary rain.
Kericho Sits in Kenya’s Wettest Region
The sheer volume of rainfall Kericho receives is part of the story. Kericho is located in the wettest area of Kenya, with annual precipitation reaching roughly 1,915 to 1,990 millimeters, and the central part of Kericho County, where most of the tea is grown, receives the highest rainfall in the region at around 2,125 millimeters annually. More rainfall generally means more of the towering thunderstorm clouds capable of producing hail, since hail forms specifically within strong convective storm systems rather than the steadier, gentler rain typical of drier climates.
A Predictable Afternoon Storm Pattern
The daily weather rhythm in this part of Kenya follows a consistent pattern that favors hail formation. Mornings across the region are generally clear and sunny, with showers and thunderstorms developing in the afternoons and evenings before clearing again after midnight. This pattern reflects how solar heating builds through the morning, creating the warm, rising air that fuels afternoon thunderstorm development—exactly the kind of atmospheric instability that produces hail when it interacts with the cooler air found at higher elevations like Kericho’s.
Peak Hail Season Aligns With the Long Rains
Hail in Kericho isn’t a random, isolated event—it follows a fairly predictable seasonal pattern. The wettest months in Kericho fall between March and July, with April typically the wettest month of the year at around 246 to 265 millimeters of rainfall, and this same window overlaps closely with when hailstorms are most frequently reported by farmers in the region. Heavy hailstorms specifically occur in Kericho County and in Trans Nzoia County near Kitale, marking these as two of the more hail-prone areas within Kenya’s broader highland belt.
A Growing Problem Tied to a Warming Climate
Local researchers have noted that hail activity in Kericho appears to be intensifying over time. The Tea Research Institute in Kericho has tracked a rise in temperature of about 2 degrees over the past 60 years using its own weather station data, and this warming has been linked to more frequent hailstorm activity affecting the region’s tea fields. Farmers in Kericho and neighboring Nandi County have reported tea bushes damaged by hailstorms since 2013, with some farms taking as long as three months to regenerate after a severe hail event—a significant blow given that tea is the primary livelihood for many households in the area.
Why This Matters for the Region’s Signature Industry
Kericho’s climate is exactly what makes it ideal for large-scale tea cultivation—the same warm days, cool nights, and abundant, well-distributed rainfall that support year-round tea growth also happen to be the conditions that produce frequent hail. This creates a genuine double-edged relationship between the region’s climate and its economy: the same atmospheric setup that built Kericho’s reputation as the heart of Kenya’s tea industry is also the source of one of local farmers’ most persistent seasonal risks.
Join The Discussion
If you’re from Kericho or have visited during the rainy season, have you experienced the region’s hailstorms firsthand? For those in the tea industry or with family connected to it, how has changing hail frequency affected farming in recent years? Share your experiences, observations, or questions about this distinctive highland climate below.
