A good average is between 20 and 25 mm per week during the warm summer months and reducing during cooler or rainy months of the year.
Nacheletelo lawa ya ringaneleke yale xikarhi ka 20 na 25 mm hi vhiki hi minkarhi leyi kufumelaka ya tinhweti ta ximumu kutani swihunguteka eka tinhweti letinga hola kumbe himinkarhi ya mpfula ya lembe.