Well on average hair grows 1/2" a month and normally quicker in summer. For me however, i get my best growth in winter and unless I take my vitamins I am lucky if I get 3" a year!
Lots of things can cause slow growth, breakage this can give the illusion that hair is not growing, when in fact it is but is breaking as fast as it grows. Stress also is a major problem in causing slow growth and medical conditions such as hypothyroisism and anaemia just to name 2!
As long as you keep hydrated and are nutritionally healthy growth should be steady, it is normal to have month (s) where hair stalls, this is normal and growth will re-commence as long as your not at terminal length.
Also one last thing, I find photos more consistent to measure growth, as a tape measure can lie, just by dipping or raising your head can add or reduce an inch!
Ive probably missed stuff out but hope its of help for you, BTW your hair looks lovely.
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