WOW! I'm complaining that I had to put on long pants this week, and you've got snow!
A solution pH between 5.5 and 6.5, +/- 0.5 is fine. However, the fertilizer will affect that, as will the plant and the potting medium. The thing to do is make up your solution, and water thoroughly, saturating the potting medium. Wait 15 minutes, and dribble about 50 ml (or so) of pure water over the mix, collecting the runoff. The pH of THAT will tell you what the plant is experiencing, and that's what's important.