The table itself is pretty simple: It's just two columns, one with
every zipcode in the US, and the other with the corresponding
weather code.
If the weather-codes are all as short as in your example, you could
create a file that's just an on-disk flat array of weather-codes,
indexed by zip code. In other words, if a weather-code is at most n
bytes long, you just seek to zipcode*n in the file and read n bytes.
Assuming n==8 as in your example, it would be an 800kbyte file. (But I
bet it will compress really well, so it'll increase your app's
download size by much less than that.)
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