The Jefferson Memorial framed by cherry blossoms on April 8, 2009. ( CWG photographer Ian Livingston)

DeFeo, speaking at a press conference at the Newseum this morning, said he expects peak bloom to occur between March 24 and 31. The average bloom date is around April 1. Peak bloom is defined as the day on which 70 percent of the blossoms are open.

Related: D.C. cherry blossoms’ peak expected March 24-31, during 100th birthday bash

DeFeo explained the bloom periods starts a few days before the peak bloom date and can last up to 10 days after, although there is some year-to-year variability.

Unseasonably warm weather for much of the winter has led to “a lot of speculation”about the bloom date, DeFeo said. But the 3rd warmest December to February period on record in Washington, D.C. has little bearing on the bloom dates, he said

“It really only matters as to what happens from now on,” he said. “All the warm weather before did not move the cherries along. But now, yes. Now is the time where, if it gets really, really warm, things could accelerate.”

As David Streit reported yesterday, the earliest blossom peak on record occurred on March 17, 2000. That year, temperatures were 5 degrees above average in March. No freezing temperatures occurred before the peak bloom (during March) and temperatures surged to between 70 and 85 degrees for four straight days March 7-10.

NOAA’s 30-day outlook for March indicates a good chance of above average temperatures for much of the eastern two thirds of the U.S. (NOAA CPC)

Related: March outlook: Warmer than average, low snow chances

Beyond the next week, NOAA’s 6 to 10 and 8 to 14 day outlooks also indicate warmer than average weather in D.C.

“We’ll be monitoring the buds and providing [bloom date prediction] updates as appropriate,” DeFeo said.

Related: National Park Service Bloom Watch website

The latest cherry blossom peak occurred April 11, 1993 when temperatures were 4.6 degrees below normal in March. There’s no indication of cold weather like that this year.


Your Cherry Blossom photos (gallery)
Cherry blossoms with an overcast sky (PHOTOS, 2011)
Washington’s cherry blossoms in the snow (PHOTOS, 2011)
A cherry blossom bird’s-eye view (PHOTOS, 2010)
Cherry Blossoms Wind Down as D.C. Greens Up (PHOTOS, 2009)
Cherry Blossom Morning (PHOTOS 2009)
Washington D.C.’s Cherry Blossom Bloom Begins (PHOTOS, 2009)
Photography: Falling Blossoms & Spring Scenes, Kevin Ambrose (2008)
Photography: A Blooming Good Time (2008)
Photography: Glorious Cherry Blossom Sunrise (2008)
Photography: Cherry Blossoms by Night (2008)
Photography: Flying High as Spring Blossoms (2008)