Changes in humidity and different crickets of the same type also produce variations in a cricket's chirping rate. The dominant factor, however, is temperature, so formulas relating temperature to the number of chirps are fairly accurate. Below are rules for finding the temperature, in degrees Fahrenheit, for three different types of crickets. The field cricket is the black cricket that is commonly found in the United States. For a field cricket, you need to count the number of chirps in 15 seconds and add 38 to obtain the temperature in degrees Fahrenheit.
Tree crickets are the small pale green ones found on trees.
For the cricket commonly called the tree cricket, the temperature in degrees Fahrenheit will be obtained by counting the number of chirps in seven seconds and adding 46. The snowy tree cricket is the species whose music is most in tune with that of the temperature since it is believed to be the most accurate. For this cricket, you need to count the number of chirps in 14 seconds and add 42 to obtain the temperature in degrees Fahrenheit.