Architects and engineers who submit proposals to build or fix New York City buildings and bridges now have city-issued guidelines on future global warming trends to consider when developing their plans.

Preliminary design guidelines issued Wednesday by the Mayor’s Office of Recovery and Resiliency require designers to factor in new data about the area’s rise in sea-level, average temperatures and cloud burst frequency.

The guidelines were developed based on the New York City Panel on Climate Change’s regional climate projections that inform the city’s resiliency policies. They only cover public structures, leaving out more than one million private buildings in the city. Previously, proposals submitted to the city relied solely on historical weather data from the National Oceanic and Atmospheric Administration. The goal of the new guidelines is to make the city’s infrastructure more resilient.

"This is really a first step,” said Susanne DesRoches, deputy director, infrastructure policy for the mayor’s Office of Recovery & Resiliency. “We wanted to ensure that city facilities are all building with the same numbers."

The new guidelines are only preliminary. They'll be piloted throughout the year, with a final version released in December. At that point, a decision will be made about codifying the guidelines.

"It's a way to start presenting some of the futures challenges and costs of climate change," said Denise Hoffman Brandt, director of the graduate landscape architecture program at the City College of New York.