お天気Webサービス仕様 – Weather Hacks – livedoor 天気情報のもの。IDがわからないよ。
色々やってみるとchromeだと表示された。ねんのため下にコピペ。東京だと130010です
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1次細分区定義表 – livedoor 天気情報より引用
主要なブラウザで表示してくれるとありがたいなぁ、と思ったりする