Organic farmers and environmental groups sued the Agriculture Department on Monday over its scrubbing of references to climate change from its website.

The department had ordered staff to take down pages focused on climate change on Jan. 30, according to the suit, which was filed in the United States District Court for the Southern District of New York. Within hours, it said, information started disappearing.

At the same time, the department also froze funding that had been promised to businesses and nonprofits through conservation and climate programs. The purge then “removed critical information about these programs from the public record, denying farmers access to resources they need to advocate for funds they are owed,” it said.

Peter Lehner, a lawyer for Earthjustice, said the pages being purged were crucial for farmers facing risks linked to climate change, including heat waves, droughts, floods, extreme weather and wildfires. The websites had contained information about how to mitigate dangers and adopt new agricultural techniques and strategies. Long-term weather data and trends are valuable in the agriculture industry for planning, research and business strategy.

“You can purge a website of the words climate change, but that doesn’t mean climate change goes away,” Mr. Lehner said.

The plaintiffs allege the actions violated three federal laws and were “arbitrary, capricious, an abuse of discretion, or otherwise not in accordance with law.” They asked the court to compel the agency to restore the pages and to block it from deleting any others.

Wes Gillingham, president of the board of Northeast Organic Farming Association of New York, said that farmers were just heading into planning for the summer growing season. He said taking information down because of a “political agenda about climate change” was senseless.