January -- Holy Name of Jesus. The feast is on January 3rd. The beginning of the month is still Jesus' birth. The beginning of the year should be devoted to Jesus.
February -- Holy Family. What can be more important that the family? Families are the building blocks for society.
March -- St. Joseph. His feast day is March 19th.
April -- The Blessed Sacrament. Easter usually occurs in April so I think it's appropriate to honor the Blessed Sacrament during this month.
May -- Our Lady. It is nice to place flowers before a statue of Mary during this month.
June -- Sacred Heart. A month to contemplate Jesus' love for us.
July -- Precious Blood of Jesus. May the Blood of Jesus inebriate us.
August -- Immaculate Heart of Mary. August 15th is an important feast day for Mary--the Assumption.
September -- Seven Sorrows of Mary. A month to contemplate the seven sorrows: Simon's prophecy, flight into Egypt, Jesus lost in the temple, the road to Calvary, Crucifixion, taking down Jesus' body, and the burial of Jesus.
October -- Holy Rosary. Feast of Our Lady of the Rosary is this month.
November -- All saints and all souls. November 1st and 2nd is All Souls Day.
December -- Immaculate Conception. Without Mary being conceived without sin, we wouldn't have Jesus.
*Adapted from The Little Oratory by David Clayton and Leila Marie Lawler