Cough for a long time, no sputum, especially when the weather is cold or the weather changes suddenly. Is it pharyngitis?

Judging from your symptoms, it's not chronic bronchitis, but allergic cough. If your cough is paroxysmal choking-like dry cough with a little white sputum, taking various antibiotics has no effect, and you have no fever, fear of cold air and smoke, itchy throat, occasional wheezing, and you will get sick when your dry cough is severe. This is allergic cough, also known as cough variant asthma.

I wonder if you will be accompanied by sneezing, runny nose and stuffy nose. If it is, it can be confirmed that it is allergic. If you don't sneeze and have a runny nose, it's pure allergic cough.

You should check allergens, and then carry out targeted prevention and desensitization. You can refer to this famous allergy website in China-"China Allergy and Asthma", which contains articles about allergic cough, cough variant asthma and allergic rhinobronchitis. Many problems can be solved without spending money. You can also go to the local allergy center.