It very likely is: simple rhinorrhea: runny nose from allergies, a cold, exposure to cold temperatures such as you suggest. The fact that you also have itchy nose and eyes suggests allergy/hay fever as a cause which would not be unusual when you find yourself in a new environment with new potential antigens/allergens. Consider an OTC antihistamine or begin a steroid nasal spray (Flonase). I wouldn't worry about CSF.
Answered 9/12/2017
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