I have medium brown hair which turns to light brown hair in the late spring. I live in SW so get lots of sun and hair gets lighter. The issue is if I send a sample now in 2 months my natural hair will be lighter by the time the unit gets here. SO, is there any way I can adjust color based on knowlege of sun's affect here in southwest? It is a noticable bit darker now then it will be soon. Our springs are very sunny and warm and it really lightens hair. I like to hike and be outside when it warms up so again, a winter sample now will not work in 2 months. What think ye