Cricket Chirp Thermometer Calculator
Count the rhythm. Explore the temperature behind the song.
Chirp Count & Timer
Result
Estimated air temperature
—Enter a count to estimateApproximation · Classic Dolbear / NWS
Species, location and nearby heat sources can change the estimate.
Chirp Rhythm Lab
Listen & Explore
Count chirps, not the individual pulses inside each chirp.
Press Play, then move the scale: warmer temperatures produce faster chirps under the selected model. Synthetic demo only; not a live temperature reading or species recording.
No sound? Raise device/media volume and check that this browser tab is not muted. On older iPhones, also turn Silent Mode off.
Demo off · audio and motion are optional.
Wing rubbing produces the song.
Schematic movement; not a species recording.
A Better Field Count
- Listen to one calling insect.
- Count complete chirps over the selected interval.
- Repeat and compare with a nearby thermometer.
Models, calibration & limits
The classic NOAA/NWS approximation is T(°F) = 40 + N₁₅. For any observation interval t in seconds, normalize to chirps/minute R = 60N/t and use T = 40 + R/4. Thus a 14-second count is scaled; it is not simply added to 40 under this model.
For eastern-US snowy tree crickets, Singing Insects of North America describes T(°F) ≈ 40 + N₁₃, equivalent to T = 40 + (13/60)R. Regional differences exist; the same source describes a different western approximation. These relationships are not interchangeable species standards.
Custom and other-species models require your own intercept and positive slope for T(°F) = a + bR. Fit paired temperature and chirp-rate observations from one identified species and locality. The page does not automatically identify insects, listen to a microphone, fit a regression or validate your coefficients.
A 10–38°C mild-weather band is used only as an advisory extrapolation cue, not a validated universal range. Silence cannot determine temperature. Direct sun, warm walls, wind, multiple singers, insect age and other factors can bias observations. One extra counted chirp changes the result by 60b/t °F; this is count sensitivity, not a confidence interval.
Frequently asked questions
Which model should I choose?
Classic Dolbear is the general NOAA/NWS 15-second approximation. The snowy-tree option is the eastern-US 13-second rule described by Singing Insects of North America. If you do not know the insect or its locality, treat either as a rough educational estimate and compare with an actual thermometer.
Can I use this for every species?
No. Field crickets, tree crickets and katydids can have different relationships. Katydid / Other produces no estimate until you enter locally supported coefficients; this avoids assigning an invented universal equation.
Why do 13- and 15-second rules differ?
They encode different approximate slopes. At the same chirp rate they need not give the same temperature. Counting duration is normalized separately from the selected model.
Is the sound a real recording?
No. It is a synthetic pulsed tone that demonstrates chirp timing, not a species call or an identification aid. The optional wing movement is a simplified schematic. Playback stops when counting starts or the page becomes hidden.
An outdoor estimate, not a calibrated thermometer.
Sources & References
NOAA / National Weather Service15-second approximationSinging Insectsof North AmericaSinging Insects of North AmericaSnowy tree cricket and regional variationThe American
NaturalistA. E. Dolbear · 1897The Cricket as a Thermometer
Source names and logos identify references, not endorsement. Species artwork and equipment are illustrative. NWS chirp converter.
Count the rhythm. Explore the temperature behind the song.