After 5 kya the monsoon began to gradually weaken and the East African climate became similar to present day, but slightly colder and drier. The lake levels in Ethiopia were low from 5.4-2.5 kya as well as in Ghana 4.5-3.2 kya. During these last 5 thousand years, Mount Kenya went through a series of minor glacial advances. There was a temperature minimum over 3.7-2.5 kya and also during the little ice age spanning the years 1300-1900 when a permafrost regime dominated on Mount Kenya.