Colours, sun and rain.

I was wondering to what extent does the way we dress depend on weather conditions, or to be more precise, do the colours we wear depend on it. In the morning do we look outside the window and consider what to wear? or do we decide by the weather forecast? or are some of us brave to actually go outside in their pijamas and feel it for themselves? In Germany I know for a fact that a lot of people are dependent on the thermometer places at the window. In Italy they are seasonal, all winter the same amount of clothes regardless to the temperatures! But I have noticed that in London there is no seasonal wardrobe, more like layering clothes. So do we wake up in the morning and get dressed in colours according to the amount of sun during the day? do we wear bright colours to light up the day, or do we wear dark colours to blend in with the sky? Revolving around this concept there is the idea that people are directly effected by weather conditions, for example, if it rains (which happens often enough) one does go to work in bike. So if it is gloomy and gray I won't wear my flower patterned skirt, or perhaps I will so I will put a positive twist to the day. Some people put their clothes out the night before, some people dress the same everyday, some people don't change at all. Some people just follow the fashion. So is their a correlation between weather and colours we wear? I will start investigating.