Unfortunately, they are also among the most difficult to predict. The effects will be complex and vary considerably from place to place. The Coming Climate by T.R. Karl, et.al. One extreme summer in the United States can't answer that question. Our picture of the climate develops slowly as we watch scores of seasons pass.
Some winters bring unusual warmth, some springs are dryer than normal.
Only by comparing measurements taken over many years and decades, can we sense the shifting patterns of climate. The recent Sahelian drought and the Midwestern U.S. Dust Bowl of the 1930's are recent examples of decadal climate changes. Undoubtedly, such natural climatic swings will be a part of our future. A more generic usage is common in the scientific community where it is necessary to be able to refer to change arising from any source. In particular scientists refer to past climate change and address the complex issue of separating natural and human causes in currently observed changes.