いじょう
... or more, beyond
A marker put down to mean starting here, and everything stacked above it. The same じょう as 異常, one mora off it: thirty degrees and up, day after day, right through the summer: いじょう.
Takes in the number itself, 30度以上 includes 30. 以下 いか does the same from below.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.