Merriam-Webster's Advanced Learner's Dictionary:
March
March /ˈmɑɚʧ/ noun, pl March·es : the third month of the year
[noncount]
• in (early/middle/mid-/late) March
• early/late in March
• We arrived on March the fourth. = (US) We arrived on March fourth. = We arrived on the fourth of March.
[count]
• Sales are up (for) this March.
• It happens every March.
✦The saying March comes in like a lion and goes out like a lamb means that the month of March begins with bad weather and ends with good weather.
- abbr. Mar.;