Passengers using Edinburgh airport dropped by 5.7% in January over the same month last year as bad weather closed other UK airports.
It described January as a "difficult beginning to the year" as numbers went down to 525,637.
The Scottish airport remained open throughout the month but was affected by other airport closures.
The airport is looking for a boost with the arrival of thousands of rugby fans for three Six Nations games in Edinburgh.
Chief executive of the Global Infrastructure Partners-owned airport Gordon Dewar said: "Despite winter weather affecting other parts of the UK, Edinburgh airport remained open.
“Our snow teams did a remarkable job, but still we were affected by other closures and passenger numbers are therefore down.
"That is clearly disappointing, but our sharp focus now is on providing the best possible welcome for visiting rugby fans in February and March.
"Looking forward, the outlook for Edinburgh airport is good. We expect our traffic to grow as we move to the busy summer months, and we start to see the full positive impact of our new deals with easyJet and Ryanair, and new routes across Europe, North America and the UK."
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