WAEC Geography 1994 Question 21

Use the climatic chart below to answer the question.
Month: J F M A M J J A S O N D
Temp (°C): 13 13 14 16 18 21 23 24 22 19 16 13
Rainfall (mm): 125 100 125 75 50 12 0 0 25 75 150 150
The mean monthly temperature is

1. A.15.55°C
2. B.16.61°C
3. C.17.67°C
4. D.18.88°C
5. E.19.56°C