Timing?

Hello, i will finish school the following year but i have exams until the beginning of June. So my question is basically if it’s is even possible or to late if i start a trip like this in the middle of June or if it would be to late and to cold in the mountains of central asia. The heat in the desert seems unavoidable but i think i ll just have to deal with it. Based on my current touring experience i would estimate that 2000km per month at least should be manageable meaning i would reach the chinese border around three months later in mid-september.