Cricket Chirp Temperature Calculator
Count how many times a cricket chirps over a set time period and enter it below to estimate the outdoor temperature, based on the well-known relationship between cricket chirp rate and temperature.
Last updated: September 22, 2026
Frequently asked questions
How accurate is estimating temperature from cricket chirps?
It's a fun, generally-in-the-right-ballpark approximation, not a precise measurement - the relationship was characterized for a specific species (the snowy tree cricket) and can be off by several degrees for other cricket species, individual crickets, or unusual conditions. Treat it as an estimate, not a replacement for an actual thermometer.
Why does the formula add 40 to the chirp count?
It's part of a simplified empirical approximation relating chirp rate to temperature in Fahrenheit - counting chirps over a 14-second window and adding 40 gives a rough Fahrenheit estimate, a commonly cited simplification of the broader chirp-rate-to-temperature relationship (sometimes called Dolbear's Law) observed in certain cricket species.
Does this work for any cricket species?
Not with the same accuracy - the specific chirp-rate-to-temperature relationship this calculator uses was characterized for the snowy tree cricket. Other cricket (and some other insect) species show a similar general pattern of faster chirping in warmer temperatures, but with different specific rates, so results for other species should be treated as a looser approximation.
Why does the calculator ask for an observation period instead of just chirps per minute?
Counting for a shorter period (like 14 seconds) is much easier to do accurately in practice than counting for a full minute, since crickets chirp quickly and continuously - the calculator normalizes whatever period you count over to the standard 14-second basis the formula uses.
What else besides temperature affects how fast crickets chirp?
Chirp rate can also be influenced by humidity, the individual cricket, time since sunset, and general environmental conditions, not temperature alone - this is part of why the estimate should be treated as approximate rather than precise, especially outside typical outdoor evening conditions.
Can I use this to check if my thermometer is accurate?
It's better used the other way around - as a fun way to estimate temperature when you don't have a thermometer handy, not to calibrate or verify one you already trust. An actual thermometer will always be more precise than a chirp-based estimate.