I think it's only right - for the safety of other cats, of course - that you conduct an experiment to determine the possibilities. I would set it up as follows:
- Buy 6 or 7 more cats
- Place all but one (the control) in freezers set to different temperatures
- Vary the temperatures by about 10 degrees, starting at 0 degrees Farenheight and going down from there
- Leave cats in said conditions for at least a week (make sure to feed them; watering them will be decidedly more difficult)
- Take note of which ones survive
- If all die, buy 6 or 7 more and start at about 30 degrees Farenheight and repeat the experiment
- If all die again, repeat with temperatures starting at 50 degrees
I know what you're saying to yourself: If they all die at 0, -10, and -20 before, why would I put them in those temperatures again? The answer is simple: you need to double-check the accuracy of your original results, and you also have to remember that they're just cats and are completely expendable.