Winter or what

Your friend sent you this message:

Look at this tomorrow it will be really cold all over the country: in Cape Town 9, in George 7, in Port Elizabeth 5 and in Johannesburg -1

Write some functions to find the hottest and coldest place tomorrow using the message above.

Your code should also work for this international weather message you got from another friend:

Look it is finally summer in the northern hemisphere tomorrow: in New York 25, in London 22, in Buenos Aires 33 and in Madrid 29

Remember to write some tests first.