And the formula for F -> C
(F - 32) * 5/9 = C
I just remember that 28C == 82F, and that 16C == 61F, so I just pick the one closest to the current temperature (its never far from either here in So.Cal.), and add or subtract the difference ( 1C == 9/5F (or ~2F)).
Update:Of course, I know that 0C == 32F, but its not something I usually have to think about, unless I leave the freezer door open :-)
(16C is considered cold here)...
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