What is the relationship between the temperature and the cricket chirp?

Get a wee wee thermometer, and some lubricant. Gently, but firmly, grasp the cricket by the wings and gently, ever so gently, insert said thermomater into rectum. Do not let the cricket drop or leave. Readings will be red.

Alternatively.... use a human ear thermometer and gently impose upon its skull, being ever so gentle, so as not to kill the cricket/.