Why would Nairobi have a warmer climate than Johannesburg?

Nairobi does not have a warmer climate compared to Johannesburg. Johannesburg is located at a higher elevation and is further from the equator, which results in a cooler climate than Nairobi. The average temperature in Johannesburg in January is 19°C, while in Nairobi it is 23°C. The average temperature in July is 5°C in Johannesburg and 14°C in Nairobi.