These standards are way old, like 1950s. What was there to lock down, back then?
Anyway, Wikipedia says this in its PAL article:
Nevertheless, I'm curious what these "geographical and weather-related peculiarities" are.
As others said/the thread was started with it is a hangover from old TV standard, which in turn also led to console standards (50Hz, despite being superior in various other aspects usually being shafted if the games were originally made in the US/Japan). As the console makers also more or less imported and set up businesses the pull from the same (Sega Japan, Sega Europe, Sega of America, Nintendo of Europe, Nintendo of Japan.........) then it also was used when it came time to localising and importing handheld games (you have the chip makers, the language people, the legal people, the marketing people, the accounting/company tax/registration..... all in place after all). Some have also argued it might have been to do with the mains voltage frequency but others say that is not the case, or at least not the case for most things.
On the geographical stuff it starts with
http://upload.wikimedia.org/wikipedia/commons/3/38/Europe_topography_map_en.png and goes further into the hills and valleys that categorise a lot of European geography. Weather patterns start with there being a reasonable amount of rain in a lot of places, snow in others, also dust from the sahara does also blow up.... all of this can also change over the course of a couple of hours.
But anyway we do discourage calling handheld consoles by TV terms and it is usually North America, Europe (which does include Australia and New Zealand) and Japan for the big three sources of games, South Korea and China (sometimes being divided again with Hong Kong and Taiwan/Taipei) having recently joined the fold in various ways. However if you have to use a term then there are worse ways to communicate what goes.
Mind you I am having a "OMG the N64 is an old console" old man moment with the concept underpinning the thread. Now if you will excuse me I have to take my horseless carriage to pay the electric light bill.
- Region locking should be forbidden by law!
Technically it does fall outside World Trade Organisation guidelines, which are pretty close to international law as far as such things go.