Go and see GP, get referred to ENT casualty clinic, get nose welded shut. End of problem.
A number of reasons why you get them more at this time of year, on top of all the other reasons for nose bleeds.
Pollen – irritant, leading to inflammation of nasal mucosa
Hot – blood vessels in nose dilate to help get rid of heat as you breath out therefore bigger and more likely to bleed
Bad Aids – more prevalent in summer