Is this a reasonable goal?

if this is your first month, you will probably lose loads - you dont have much to lose, id set your goal at around 1 pound per week, so by the end of december you should be 120 , but you may be less, the first few pounds fall off!

I've found that it's counterproducitve to set a weight goal based on a time limit. Unfortunately, you can't control that. You can do everything right and gain or not lose or lose more slowly than someone else doing the exact same thing.

A better goal is to eat right and exercise (maybe set a specific amount of time or calories to burn) every day or whatever. Maybe try to get more fruits and veggies in your diet if that's something you need, or something to that effect.

That will give you the best weight loss you can get and then you won't be disappointed if you don't lose 10 pounds in two months. It's possible and healthy, but there's no guarantee and that's the problem.

I agree with this 100%. In the first year when I could regularily lose weight each week (and had a lot more to lose) I could set goals for each month of what I wanted to weigh and I could usually reach them. But now that I have less to lose, and I am not riding the weight -loss high anymore, it's a lot more difficult. I got engaged back in January and I had 15 pounds to go until my goal. Fifteen pounds in 9 months, no sweat right? Well the pressure of wanting to lose that before my wedding was weighing on me (no pun intended) and not only did I not lose it, but I a GAINED 13 pounds!

It's good to have an overall goal in mind, such as being down to around 120 eventually, but short term it's better to set goals such as, "I'm only going to have one cheat meal this week", or "I'm going to drink an extra 8 oz of water today", or "I am going to work out 5 days this week", etc. Consequently, sticking to those goals will get you to your weight goal without adding pressure.