What is a climate?
Climate is the average and variations of weather over long periods of time. Climate zones can be defined using parameters such as temperature and rainfall. Paleoclimatology focuses on ancient climate information derived from sediment found in lake beds, ice cores, as well as various fauna and flora including tree rings and coral. Climate models can be used to determine the amount of climate change anticipated in the future.
Answer 2: (short and easy to remember, at least better that the answer that shows above.)
It is the average of weather conditions measured over a period of time, usually 30 years.