Nairobi's position in the Southern Hemisphere dictates its seasons. Typically, the summer months in Nairobi are December through February, Summertime days average 84 degrees Fahrenheit. Autumn is from March to May, and the winter months occur between June and August. Springtime is September to November. Since Kenya is near the equator, the climate is fairly temperate year-round unless you journey high into the mountains.
Conifers, or fir trees, are not true flowering plants, though their reproductive cycle is commonly referred to as a flowering cycle. The flowers of a fir tree are the cones. Each tree produces male and female cones. Male cones produce pollen that is released into the wind to fertilize female cones. The time of the fertilization process between the cones varies, though the process can take up to a year. The fertilized female cone produces a seed that drops to the ground and potentially grows into a new fir tree. Once the new tree matures, it develops its own male and female cones.
Fir trees produce male cones during the spring months and female cones during the summer months. In Nairobi, the male develop sometime between September and November, and the female cones grow from December and February. Thus, the flowering months of the fir tree in Nairobi are from September to February.