Cape Town 1.6°C above normal in 2018
The New York Times has a tool on their site which allows you to check how much warmer a city was in 2018, compared to an average calculated using data from 1981 to 2010. The data, provided by AccuWeather, comes from a database of more than 3800 cities worldwide which shows that about 83% of cities experienced average temperatures higher than normal last year.