2 jōyō kanji take the reading あめ. Compare how their meanings differ.
そら。あめ。 (方角)うえ。 自然な状態。
heavens, sky, imperial
4 strokes
あめ。
rain
8 strokes
infoOnly readings listed in the jōyō kanji table are included. Adding readings outside the table would bury the distinctions that matter in everyday writing.