I don't care how anal you are about your lawn. Mowing more than once in a week is insane.Even though it's the one month where I have to mow my yard twice a week, May is by far my favorite month weatherwise. Love the warmer (but not hot) temps, and the rain makes everything green and growing. Could do without the tornadoes, though.
Mid-Sept through mid-Oct would be my second favorite "month".