I don't want you to discourage you at all! But your goal weight by December is not realistic.
If you crunch the numbers by approximating your caloric needs as your weight goes down, and the deficit needed to continually average 10 pounds a month... it will become very difficult to eat so little as to keep a large deficit as your weight continues towards 130.
For example, let's say you weigh 150 pounds in October. Let's also assume that at 150 pounds, you need to eat 1800 calories in order to maintain that weight. Let's also approximate that 1 pound of fat represents 3500 calories.
This means that that 20 pounds X 3,500 calories = a deficit needed of 70,000 calories. 70,000 calories represents 20 pounds (very loosely but for our intents and purposes it's fine). 70,000 calories divided by the 60 days until December yields approximately 1,166 calories. This is NOT the number you need to eat. This is the number you need to NOT eat in order to lose those 20 pounds in 2 months. This mean you would have to eat on the order of 500 calories a day... not realistic and not healthy. The answer is more time.
I know it's hard, but be patient!
So if its not going fast enough, don't be discouraged. As another poster said, this is not a sprint to the finish line. It's a marathon.
Nevertheless, you can still see significant weight loss by December.
And to make up for the slower, steadier progress, lift some weights as you edge towards December. You won't be a 130 pounds, but it will change your physique so much that I bet you won't mind
I know from experience. At 150 pounds 5'2", I am not at my goal but since I lift a lot, by body looks so much tighter and fit, and most days, I don't care that I'm not at goal because it looks great. I don't even look overweight.