WASHINGTON — After a winter of alarm over the possibility that a military conflict over the Iranian nuclear program might be imminent, American officials and outside analysts now believe that the chances of war in the near future have significantly decreased.

They cite a series of factors that, for now, argue against a conflict. The threat of tighter economic sanctions has prompted the Iranians to try more flexible tactics in their dealings with the United States and other powers, while the revival of direct negotiations has tempered the most inflammatory talk on all sides.

A growing divide in Israel between political leaders and military and intelligence officials over the wisdom of attacking Iran has begun to surface. And the White House appears determined to prevent any confrontation that could disrupt world oil markets in an election year.

“I do think the temperature has cooled,” an Obama administration official said this week.

At the same time, no one is discounting the possibility that the current optimism could fade. “While there isn’t an agreement between the U.S. and Israel on how much time, there is an agreement that there is some time to give diplomacy a chance,” said Dennis B. Ross, who previously handled Iran policy for the Obama administration.