I find the conversion between the two easy enough to do it my head.
This isn’t exact but is close enough for conversations and 99% of my needs.
(Temp in F - 30) / 2
Examples
70F:
70F - 30 = 40
40 / 2 = 20C
10F:
10F - 30 = -20
-20 / 2 = -10
The actual number is 21 / -12 but this is close enough for me 99.9% of the time
The tldr bot just used SMMRY to do the work. I ran this article through it: