I’d say some where around 25.98231 and 26 Celsius. Cheerful sunlight not too hot sunlight with plenty of shade to enjoy it in. Cue the breeze – gentle enough not to ruffle the paper on a table. Or flip the pages of the book for you. Humidity should be civilised enough not to make you sweat but high enough to avoid shrivelling to a dehydrated husk.
Such conditions are usually attained through artificial means in Colombo. Particularly by the coolest people in Sri Lanka.
But enough about me. What’s YOUR definition of cool?
Darwin has a scientific example which is very cool. 🙂