1-Weather and  Climate 

Weather is a specific event. It is the  state of the atmosphere in a specific area over a few hours, days or weeks.

 Climate is the average weather conditions in a place over 30 years or more. It is the characteristc state of the atmosphere in a specific area over a long period of time.

Weather refers to short term atmospheric conditions while climate is the weather of a specific region averaged over a long period of time. Climate change refers to long-term changes.