When to Use Fireworks

When do you think is the best time to start getting interested in fireworks? I have been mostly interested in them around Christmas and New Year, but somebody recently recommended me the use of ammonium nitrate in summer. The only problem I have with using fireworks in summer is that nights are a lot shorter than they are during winter. This might make the use of fireworks a lot less effective. This is why might wait with thinking about them until the next winter and see what I can do about getting them. For know, I prefer to concentrate on something else.