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Dolbear's Law




Dolbear expressed the relationship as the following formula which provides a way to estimate the temperature ''TF'' in degrees Fahrenheit from the number of chirps per minute ''N'':

T_F = 50 + \left ( rac{N-40}{4} ight )

This formula is accurate to within a degree or so when applied to the chirping of the Snowy Tree Cricket . Reformulated to give the temperature in degrees Celsius , it is:

T_C = 10 + \left ( rac{N-40}{7} ight )

The above formulae are expressed in terms of integers in order to make them easier to remember - they aren't intended to be exact.
The chirping of the more common Field Cricket is not as reliably correlated to temperature - its chirping rate varies depending on other factors such as age and mating success.


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