The term 30-DAY MONTH refers to months in the Gregorian calendar that have 30 days. The five solutions for this term are APRIL (5 letters), SEPT (4 letters), JUNE (4 letters), ADAR (4 letters), and Shebat (6 letters). APRIL is the fourth month of the year, and is known for its showers and blooms. SEPT is the ninth month of the year, and is often associated with the start of the school year. JUNE is the sixth month of the year, and is known for its summer solstice. ADAR is the twelfth month of the Jewish calendar, and is a time of celebration and joy. Shebat is the fifth month of the Jewish calendar, and is a time of reflection and contemplation.