Blocked nose 4 months after rhinoplasty, is this normal?

I am sorry to hear you are not breathing as well after surgery compare to before.  You should ask your surgeon to evaluate the nose for any potential obstructions that can be addressed either surgically or non-surgically.

Since your breathing fluctuates with the weather, at least part of your obstruction may be from your turbinates. Turbinates are internal nasal organs that function to filter and humidify the air you breathe. Turbinates change in size depending on the environment you're in, so if your breathing is improved in warm climates, this may mean your turbinates shrink when it's warm. You should discuss your concerns about postoperative obstruction with your surgeon. Many cases of nasal obstruction after rhinoplasty may be improved without a return to the operating room. Hope this helps. Dr Joseph

I'm sorry to read that you're experiencing discomfort after your rhinoplasty. I recommend seeing your surgeon for a full evaluation of your symptoms. It's possible that the weather-related congestion you're experiencing can be resolved without a revisionary procedure. I hope you're breathing easier soon!