It's Getting Chilly

The current temperature is 51° F. Why we still use Fahrenheit here is beyond me. It works out though, because I have no internal sense of the difference between 10.5° C and, let's just say, 21° C. I intuit that 21° should be twice as warm, which I suppose it is, but it's certainly not 102° F. What I'm trying to say is it's chilly outside on the Collingswood parklet tonight.