Even if it were the hottest 3 weeks in the last 44 years, it's still the top 3 out of 2288 or so.

However, it's not the hottest 3 weeks (which would be an average of 7 days each). It's the hottest 21 individual days. Each and every single one of them. The top 21 out of 16060 all happened consecutively, "now". I don't get how much more "dramatic" it needs to get before people like you understand what's going on.