I beg to differ! I believe that it has to do with the temperature scales each uses (US - Fahrenheit, Canada - Celsius).
Besides, there are two things to consider:
1. A block of ice won't melt instantly;
2. Contrary to what many people may believe, most of the populated parts of Canada are above freezing temperatures for most of the year!
You are right. I have stumbled into the trap of overthinking the Country's significance. The answer should be the same regardless of where the test takes place. My bad.