How does weather affect your business?

In Britain one of the most talked about topics must be the weather. We are at the beginning of summer and gray wet days are more common than sunny days, when I asked a local about a possible reason for this I was told that worm masses of air from the Atlantic crush with cold masses of air from the Nordic area, and all of this happens just on top of the UK. Who knows it may be true.

Relating the weather topic to business, the other day a taxi driver started complaining about a sunny week in May (rare event) saying that people stop using taxis in Cardiff when the weather is nice. At the same time I look at the touristic area of Cardiff Bay and I see empty restaurants on rainy days and the same places full of life and people in sunny days.

I think it is interesting to measure the effect of external events, such as weather, in your business and see if you can take advantage of this, for example if you are a retailer and you see certain products sell more in rainy days, then you would be careful to have enough stock in winter time. How does weather affect your business?