The
Hebrew Calendar is divided into the following months:
TISHREI - 30 days
CHESHVAN - 30 days
KISLEV - 30 days
TEVET - 29 days
SHEVAT - 30 days
ADAR - 29 days
NISSAN - 30 days
IYAR - 29 days
SIVAN - 30 days
TAMMUZ - 29 days
AV - 30 days
ELUL - 29 days
From these links you can see what holidays are celebrated and what significance they are to the Jewish faith.