Can cold wether can cause cold (flu)?

No. Cold weather may increase your chances of contracting the flu. Cold air may drive people to stay indoors and thus increasing your chance of coming into contact with the virus. Also, cold air may lowe your body temperature thus weakening your immune system. Cold air may also "stun" your airways and make one more succeptable to influenza.
Old wives tale. The idea that the cold temperatures cause a cold is not true. Colds and the flu are caused by viruses.