The city enjoys a sunny climate, with the summer months (October to April) characterised by hot days followed by afternoon thundershowers and cool evenings, and the winter months (May to September) by dry, sunny days followed by cold nights. Temperatures in Johannesburg are usually fairly mild due to the city’s high elevation, with an average maximum daytime temperature in January of 25.6 °C (78.1 °F), dropping to an average maximum of around 16 °C (61 °F) in June. The UV index for Johannesburg in summers is extreme, often reaching 14-16 due to the high elevation and proximity to the equator.
There are eleven official languages in South Africa (Afrikaans, English, Ndebele, Northern Sotho, Sotho, Swazi, Tsonga, Tswana, Venda, Xhosa and Zulu), all of which are spoken in Johannesburg.Fewer than two percent of South Africans speak a first language other than an official one. Most South Africans can speak more than one language. Dutch and English were the first official languages of South Africa from 1910 to 1925. Afrikaans was added as a part of Dutch in 1925.