If you live in England anyway.
Full month of school holidays but invariably much worse weather than June and July, combined with the fact it is noticeable that the nights are drawing in.
Combined with the pressure to make the summer holiday memories and the expense of doing so.
Mix in the back to school shopping (and the amount that sets you back) and the failure of any retailer to stock enough items, and then trying to find, amongst the small selection, shoes that are black and polishable and have no logo AND that a teenager is prepared to wear.
Then the realisation of what is coming -the school runs in worsening weather, the homework onslaught, the extra curricular, the extra washing, the dark nights but all combined in a month which is meant to be joyful.
Give me January any day!