1999 Toyota Corolla LOUD BANGS

Everytime my car hits a small bump even a sewer cover the noise it makes is almost unbearable. It is mostly coming from the back passenger side right by the tire. I notice when the temperature goes down it will do it but when it warms up it doesnt. Last time I had it checked they said I need struts. Is this noise a result of the struts? Or do you think something else is causing this? Why does the real cold weather make this happen? It is so bad it seems that I dont have any shocks on that side. Thank you kathy