Question

how can we know between two station which one has equable climate

Answer 1

The ideal (theoretical) equable climate has a mean annual temperature of 14°C and a mean annual range of 0°C. Since 14°C is and has been the average mean temperature of the earth's surface, any departure from 14°C and 0°C results in a climate of lower temperateness or equability. Therefore, reference to an equable paleoclimate is meaningless unless quantified by a centrum from which equability is measured. Climates of low seasonality are not necessarily equable because such conditions occur from the inner wet tropics into glacial-border environments. Freezing often occurs in climates of moderate to high equability. Equable climates may support taxa from different vegetation zones, a relation also evident in the paleobotanical record.