not possible. 13 mths * 28 days = 364 days. However earth revolution around the sun is 365.24 days. After 150 years, summer would be during winter months.
Discussion
Ok. I didnt really think about how many days it was. Thanks
To be fair, having the last month in each year have 29 days & 30 every 4th year would still be cleaner than what we've got, but unless we created extra last month days of the week it would mean that days & dates wouldnt line up either so it kinda makes the idea less interesting.