A person who will only be your friend when things are going well. When things start going wrong a fair weather friend won't be there for you.

For example :-

1. He is really just a fair weather friend because whenever I need his help, I do not find him.

2. When I was facing problem, she didn't call or met with me. She is just a fair weather friend.

3. Always be a good & supportive friend, never be a fair- weather friend.