Data alone is not enough. Or, you should have lots of it, and use and weigh it properly. Temperature, humidity, winds, sunlight, duration and intensity of rain

Data alone is not enough. Or, you should have lots of it, and use and weigh it properly. Temperature, humidity, winds, sunlight, duration and intensity of rain, clouds... The list goes on and on. And what about pollution? Milan is one of the most polluted cities in Europe, and people wouldn't guess it. You could have nice weather, be outside, and not enjoy breathing (Milan is still ok, there are much worse places like New Delhi).