Why is it hot in summer and cold in winter?

Question: Why is it hot in summer and cold in winter?
- Keywords:
  cold,
  hot,
  summer,
  winter
Asked by hannah to Pip, Reka on 18 Nov 2016.
- Reka Nagy answered on 18 Nov 2016:
  
  Because Earth is further from the Sun in winter (on this hemisphere, anyway) so the sun’s angle hits us differently and for a shorter amount of time.
  
  On the southern hemisphere, however, it is hot during (our) winter and cold during (our) winter!

Question: Why is it hot in summer and cold in winter?