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The latest leg of a solar-powered airplane's around-the-world journey has been postponed due to weather conditions.

The Swiss-made Solar Impulse 2 was scheduled to take off from Lehigh Valley International Airport in Allentown and head to New York City around midnight Monday, but project officials announced around 12:30 a.m. Tuesday that the flight had been postponed because of showers and thunderstorms moving through the area.

The plane was scheduled to fly over the Statue of Liberty before landing at John F. Kennedy International Airport, its last stop in the United States before crossing the Atlantic Ocean. It wasn't immediately clear when the flight would take place.

Read More: Solar Impulse 2 Lands in California After Risky 3-Day Flight

The plane has been in Allentown since May 25.

The voyage began March 2015 from Abu Dhabi, the capital of the United Arab Emirates.