I came across this popular folklore rhyme while searching for wedding anniversary ideas:
January - Marry when the year is new, he'll be loving, kind and true.
February - When February birds do mate, you wed nor dread your fate.
March - If you wed when March winds blow, joy and sorrow both you'll know.
April- Marry in April if you can, joy for maiden and for man.
May - Marry in the month of May, you will romance the day.
June - Marry when June roses grow and over land and sea you'll go.
July - Those who in July do wed must labour for their daily bread.
August - Whoever wed in August be, many a change is sure to see.
September - Marry in September's shine so that your life is rich and fine.
October - If in October you do marry, love will come but riches tarry.
November - If you wed in bleak November, only joys will come, remember!
December - When December's snows fall fast, marry and your love will last.

Source: www.anniversaryideas.co.uk

P/S: Not that it matters in Malaysia where couples choose school holiday months to tie the knots rather than the significance of the month ;)