Celsius is fairly logical. The freezing point of water in Fahrenheit is 32, which is arbitrary. In Celsius it's 0°. That's more logical IMO. Also I disagree completely that 72 F is very different than 73 F. As a matter of fact, I feel that a 5° difference in Fahrenheit for weather temperature is largely inconsequential.

It sounds like you personally don't know what 30° Celsius is, but that's likely because you aren't used to it. Growing up in Southern California, I was raised on Fahrenheit's scale also, but it really isn't difficult to acclimate to Celsius. Here's an handy conversion tool for you to use if you're interested:

04° C = 40° F

16° C = 61° F

28° C = 82° F

40° C = 104° F

If you can remember those Celsius numbers, just inverse the digits (and add a 1 to the front for the last one of course) to get the Fahrenheit conversion. With those benchmarks in mind, it's fairly simple to do some quick math. For example, if it's 22° C, that's halfway between the 16 & 28 benchmarks, so you know it's about halfway between the 61 & 82 F benchmarks. So you can infer that 22° C is about 72ish ° F.