"The general or average weather conditions of a certain region, including temperature, rainfall, and wind. On Earth, climate is most affected by latitude, the tilt of the Earth's axis, the movements of the Earth's wind belts, the difference in temperatures of land and sea, and topography."

Extremes that shift are worrisome, outliers are not.

So if the range of observed temperatures for a region is -25 to 39 and you get a year where it is 45 then that's a very worrisome development because it indicates the climate range has expanded. This as opposed a year with 38 which would still be an outlier but not a shift in range.