You can find some examples of the phenomenon in question below:
- Ides of March
- March hare, mad as a March hare
- March madness
- Winds of March, March winds (I recall that the MAD staff even produced a special March winds issue many decades ago).
Can you name another month of the year which is as "popular" in the English language as March? If not, do you have any clue as to why it is that there several "expressions" in English which allude to that month?
Thanks in advance for you insightful replies.