Be careful this summer! Its looking to be quite sunny! Well anyway this talk is for your safety, if it is too hot then stay inside (20 or up) (less likely!) If it is mild but still warm and quite hot is safe, but not without sun cream. You need to ask if you have any sun cream! (18 to 16)If it is lower you'd probably put a little bit of sun cream on! (14 to 12)
This isn't to boss you about but it is to keep you safe because I don't want to hear "I got burnt by the sun!" after the summer holidays and maybe this holiday!