Best is probably
Boston for me. Similar to my town but slightly cooler, which is perfectly fine as I like summer highs to be around 75-80.
A
Next I think would be
London. Summer temps are lovely with highs in the mid 70's and clouds are great if it's 70+.
A-
After that I'd probably choose
San Francisco. Average highs are a bit cooler than I'd like but upper 60's are still quite pleasant, especially when sunny. However it is definitely too dry there, not even a lick of rain in July? That's ridiculous.
B-
Next up is
Yakutsk. It's a shame that this one is so far down because the July highs are absolutely perfect. However, the lows get way too chilly for my liking. Record low of 18 in AUGUST?
Not fun at all! Plus the "summers" are so short that they don't even last the entire period! By late August temperatures are probably getting into the 50's. I'd like my summer to be longer than just 1 month and some change.
C
Safe to say that
Madrid would be next for me. This is the last of these cities where I could actually tolerate the weather. Average highs are a bit too hot being basically 90 in July but I think there would be enough decent days (high below 85) sprinkled in between the hot days.
C-
Getting towards the bottom now,
Reykjavik is next. This city barely even has a summer with highs struggling to even hit 60 during the summer. There might be a random nice day here or there judging by the records but it doesn't make up for the rest of the summer weather. Plus average daylight hours being under 200 is just miserable with temperatures like that. I'd rather not be walking around in a jacket in the middle of July!
E
Hard to choose which one is the worst between the last two but I guess the less terrible one is
Houston. Reykjavik is pretty bad but at least there's bound to be a few decent days here and there. For Houston? Not likely. Summer temps are WAAAY too hot and the humidity makes it even worse. Average high of 94 with average humidity of 75%???
Absolutely disgusting! However I think that despite the heat and humidity, I would still take this over the next climate because at least there's some rain.
F
Last place is
Mecca. Normally I do prefer a dry heat over a humid heat but Mecca is a whole different case. This isn't a dry heat at say, 100 degrees, this is a dry heat at NEARLY 110!!! And that's just the averages! I don't even want to know what that record high of 121.6 is like, especially with all that sun! Plus basically no rain at all the whole summer would make things get boring really fast. Just edges out Houston for worst climate.
F-