旬 in season/ time of month

日 (sun, day) + (wrap)
★★☆☆☆
6 strokes
JERK

Onyomi

JUN

Mnemonic

JUNE is the best time to see the sun wrapping festival.

Kunyomi

( xxx ) しゅん meaning, when something is in season i.e. fruit LAZYSUF
★★☆☆☆

Jukugo

下旬(げじゅん)

end of month ☆☆☆☆☆
下 (below) + 旬 (in season/ time of month) = 下旬 (end of month)

上旬(じょうじゅん)

beginning of month ☆☆☆☆☆
上 (above) + 旬 (in season/ time of month) = 上旬 (beginning of month)

中旬(ちゅうじゅん)

middle of the month ☆☆☆☆☆
中 (middle) + 旬 (in season/ time of month) = 中旬 (middle of the month)