The relationship between cricket chirping and temperature has been noted for a long time. In Western science, it is called Dolbear’s law after the most widely referenced early publication on the phenomenon published in 1897 by Amos Dolbear. His observations showed that you can count the number of chirps per 15 seconds, add 40, and that will give you the temperature in Fahrenheit (F).
Dolbear's law
Temperature (F) = number of cricket chirps in 15 seconds + 40
There is of course no calculation for Celcius but NOAA offers help:
To convert a Fahrenheit temperature to Celsius, subtract 32 from it and then multiply by 5/9:
°C = (F - 32) * 5/9
Weirdos xD
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