The average annual rainfall in Nairobi is about
900m, but the actual amount in any one year may vary from less than 500
mm to more than 1500 mm. As already mentioned, there are two rainy seasons,
from mid-March to the end of May (the so-called "Long Rains"), and from
mid-October to mid-December (the "Short Rains"). The dates on which these
rainy seasons start and end are very variable; in fact the beginning and
end of a wet season are seldom, if ever, well defined. These seasons coincide
approximately with the time of changeover of the monsoon currents which
affect Eastern Africa, the South-West Monsoon becoming established in April,
and north-east monsoon in November.
| January | February | March | April | May | June | July | August | September | October | November | December |
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