Arctic sea ice this summer dropped to its eighth lowest level on record, new federal data shows.

That's far below average, but considerably above the record low set five years ago.

The National Snow and Ice Data Center said Tuesday that on Sept. 13 sea ice in Arctic shrank to its smallest area of the season: 4.64 million square kilometres.

Data centre scientist Ted Scambos said the Arctic sea ice set a record for the smallest winter amount earlier this year and was close to 2012's record low levels through July. Then a cloudy and cooler-than-normal August kept melt to a minimum.

"Weather patterns in August saved the day," Scambos said.

Refrigerator for Earth's climate

The Arctic acts as a crucial refrigerator for Earth's climate, scientists say. A growing number of studies have linked Arctic sea ice decline to changes in the jet stream and some bouts of extreme weather.

"It's bound to have an impact on global climate," Scambos said.

"The Arctic will continue to evolve towards less ice. There's no dodging that." - Ted Scambos

This year's low is 1.58 million square kilometres below the 30-year average but it is also 1.25 million square kilometres above 2012's record low.

The data centre uses satellite readings that go back to 1979.

Scambos said this year is clustered with several other recent years behind 2012.

He said this year's sea ice level fits with an overall steady decline over the decades, but one that varies in fits and starts.

The latest findings do not mark a recovery from 2012, he said. Instead, they suggest that 2012 was an outlier, with a combination of freak conditions that dropped levels lower than normal man-made global warming would cause, Scambos said.

"It's not going to be a staircase heading down to zero every year," Scambos said. "It's not the same as in the '50s, '60s, '70s, '80s or '90s.

"The Arctic will continue to evolve towards less ice," he added. "There's no dodging that."