Thank you for making the time to comment, and for alerting me to the existence of the NRS.
Hello,
The national rosacea society has stated that some of the most common rosacea triggers include sun exposure, emotional stress, hot or cold weather, wind, alcohol, spicy foods, heavy exercise, hot baths, heated beverages and certain skin-care products.
So it may be any of the climatic factors mentioned above.
I hope it helps. Take care and regards.