this post was submitted on 24 Jan 2026
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Chapotraphouse
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let me show you the way
10° C -> 50° F
20° C -> 68° F
30° C -> 86° F
40° C -> 104° F
you can see here that 5° C = 9° F, but the ratio of 10 and 18 is easier to work with. if you remember these four points (and you surely already know 0° C = 32° F) you can freely interchange in your head or at least get a general idea what the weather will feel like
(with practice when someone says 25 °C, you know that's 68 + 9 = 77° F)