NAIROBI RAINFALL

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.
 
The average rainfall(mm) for each month of the year, based on records for 50 years
January February March April May June July August September October November December
48
48
115
195
137
42
15
21
24
52
114
77


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