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Interesting.

As far as I can tell though, it doesn't seem to account for humidity, pollution or wind patterns. The former is especially important for hot climates (or times of the year) since when it comes to comfort, hot dry >> hot humid.

Yeah it doesn't account for a lot of stuff. I'm in a Mediterranean climate here and it's suggesting a lot of places that are very far from that. If it's supposed to be used for plant growing related purposes it's not going to be very useful.
I tried to search for my city and got back:

  EAST LONDON, SOUTH AFRICA
  LONDON AIRPORT, CANADA
I would have thought London (UK) might have got a mention.
Seconded.
No results for Manila, Kuala Lumpur, or Singapore either
No results for Prague and Dublin. For Vienna, if found Vienna, VA, USA, not Vienna, Austria.
Try the local names. Praha, Wien, and some unknown mystical name the Dubliners use.
Praha and Wien work, Baile Atha Cliath (local mystical name for Dublin) doesn't.
When I type "København" it responds with an empty page. It seems like any non-ascii character makes the page crash.

It doesn't have "Copenhagen", only "Koebenhavn" which nobody uses.

One of the cities it gives for Estonia is "Pjarnu", for Pärnu.

But then it also thinks the capital is "Tallin", rather than Tallinn.

something missing from the title "some cities"
I couldn't find Kathmandu, Nepal on it. Thanks, pretty cool site!
Some sort of filter-by-country, or even just more than 10 results would be a nice addition.

And a 'minimum population' control.

Cool, although the recall leaves something to be desired.
Nice idea. I like the clean interface and it's very responsive. Nice comparison feature as well. I think you need some kind of canonical name resolution though.

For example, searching for 'Moscow' returns nothing -- but it is found as 'Moskva'. Also, nothing is returned for 'Nairobi', but it's there as 'Jomo Kenyatta International' which is their airport. Not exactly obvious.

Overall very nice work.

Adding in maps would also be interesting - seeing where these different "similar" places on the planet are.
This city search is the worst one I've ever used. Devs, please test your sites, even the toy projects.
I typed in 3 large US cities and got 3 "no results found". Google map API is your friend.
I tried London, but it only gave me a place in South Africa or a canadian airport.
Is it only showing airports because the dataset uses climate data from aeronautical sources?
Results found for: amsterdam

* No results found.

Great product!

Nice Project.

Bug: as soon as you enter mon ASCI Charaters in the search, it will return a blank page, tried: münchen (munich), 東京 (Tokyo).

I tried searching for my city (Tromsø), and got an absolutely blank page back.

At least tell me "City not found".

It looks like it works if you write it 'Tromso'. But you have to write Copenhagen as 'Koebenhavn', so it seems inconsistent in handling the ø.
no result found for cape town, south africa. :S
Doesn't find Tampere, Finland.
Nice hack. The visualization is well done.

Feature idea: It would be cool if you could sketch the min/max temperatures and rainfall you'd like for your ideal city, and it would tell you what's close to that.

Do a search for 'South Africa' - the cities it returns are all small cities which are just big enough to have airports. In the cases of places like new york, only the airport is returned.

I'm just guessing here, but possibly this is a database of geographical locations with a population figure attached. The author has probably swapped 'only show cities with greater than X population' with 'only show cities with less than X population'. Airports would have very low population, and that's why there are so many airports. It also doesn't handle non-ASCII characters.

It's a guess, anyway.

https://en.wikipedia.org/wiki/National_Weather_Service

in the US the NWS / NOAA operates weather stations at airports, wouldn't be surprised if other countries have similar programs.

my hometown has a much larger population than the next one over, but the next one over is listed because there's an airport there.

You missed my point maybe - the fact that your hometown is bigger and not listed is exactly the problem. There are a number of small cities listed that do not have airports also. The key is that a listed city either lists as 'airport' (population 0), or is a very small city (low population). So my point is that the filtering is probably backwards, and it's filtering out big cities instead of filtering out small ones.

Maybe. ;)

Might it not be likely that an application dependent on weather data is actually limited to locations for which weather data is available, regardless of population?
It doesn't know about London?

    Results found for: london

    EAST LONDON, SOUTH AFRICA
    LONDON AIRPORT, CANADA
What I really like about the search, is that it accounts for seasons on different hemispheres. E.g. it returns Lisboa and Cadiz as places similar to Sydney. Even though the months with hot weather are different in the Northern and Southern Hemispheres.

As a side note - clicking the name of a place shows an overlay in the graph. It was not obvious at first; the names are in black.

Overall, this is pretty alright, though I'm looking at the climate results for Boston in the summertime right now, and as sweat pours down my face I really really wish that 25°C was the average temperature around here in June-July.
Why are the colours so similar?

What about a link to see cities that are the most opposite?

Can you just list the cities you actually support instead of masquerading with a search box?