Being born and raised in the South, I had heard this many times. When I got a request to do this, I did the research and though we are not MythBusters, we do try to please our public. Try as I might, I could not verify that Southern crickets chirp with a drawl... Part of our research information came from the "Cricket thermometers," Field & Stream, July 1993, Vol. 98 Issue 3, p21. We have refined the formula but the thought process is the same general thing.
If you would like to experiment with temperature conversions, try our converter that covers all these scales; or our less word intense version. If you are like most people and are only interested in Fahrenheit and Celsius, try our most popular temperature converter.