Judy, you won't know what size the next floater is until you get your pinwheels pieced.
Of course, you can combine the two floaters, but it's also possible to add the border to your February block, and just make it wide enough to finish at less than one inch, then make the first floater for next month a little more narrow. Sue's math will make it simple, whichever way you decide to do it.
If you will go to SHOW & TELL and look at Sue's finished quilt, and my finished quilt (the first and third photos posted) you will see that the floater strips around our pinwheel borders are significantly different widths. We are all making one of a kind quilts this year!