The word climate comes from a Greek term for an Earth zone limited by two latitudes, and was associated to the inclination of sunbeams and, by extension, to the prevailing weather features.
In broad sense, climate is the synthesis of both weather and our expectation on weather conditions. This is, in the essence, the notion that should be retained. Scientifically, the attributes of the definition should be established in quantitative terms since, in climate, phenomena matter according to their duration or persistence, to their repetition, and are characterised through mean values, variance, and probability of occurrence of extreme values of the climatic parameters.
The climate of a given place depends on the time interval used and is not the same for one year, one decennium or one century. In the quantitative description of climate, it is necessary to indicate the period (time interval) to which the numerical values obtained correspond. In fact, climate varies with time, and so climates should not be compared by using values that correspond to time intervals with a different number of years or that correspond to the same number of years in different periods.