I started (this time) in February 2014. I lost nearly 20 the first month, at or around 15 pounds for the next couple of months, and then averaged around 11 pounds a month over the summer. Then things started slowing to single digits. In October & November I was down to 7 pound per month.
Up to that point, I was just 'winging it' as far as the diet goes. I stuck exclusively to 'on plan' foods and I let my appetite guide me. I roughly counted the carbs and occasionally counted calories just to see where I was at. I was averaging < 35 net carbs and somewhere around 2600 to 2800 calories per day. By November, I was down 120 pounds and simply was not burning the same calories I was when I was 400+ pounds. The slow down was inevitable.
At that point, I started "dieting" within this way of eating. I started tracking food, reduced my snacking between meals, and started doing intermittent fasts once or twice a week. I set a target of under 2000 calories per day. This refocus got the scale moving faster again. I averaged a 9 pound per month loss in December, January, and March. February was a bit of a fluke (3 pound loss) due to the fact that I stopped taking blood pressure medication and that resulted in a 5 pound water weight gain. Take that away and I lost 8 pounds of fat in February.
FYI: I do not lose weight evenly from day to day. I plateau for up to 3 or 4 weeks and then go through several days of daily drops. As I lose fat, my body stores water in its place. When my body figures out that I have no intention of filling those cells again with fat, it dumps the water. I've learned it is best to just chill about the scale and wait out the plateau, although I don't always succeed. It is hard not to get stressed when the scale number doesn't move. Month to month, the loses are pretty even. But day to day and even week to week - I often see little change in the scale.
FYI: Here is what my weight loss chart looks like...
If I posted my weight every week, it would look like steps. But since I only log it once a month or so, it looks like a smooth rate of loss. BTW: I have no idea what is going on with the double march lines at the bottom. It seems to be a glitch with the software here on MY PLAN.
Hope this helps.
Stay on plan and you will get where you want to go.