The Bank of Canada kept its target for the overnight rate steady at 1.0 per cent on Tuesday, citing a worsening global economy for the need to maintain the current level of stimulus.

The bank hinted it may have to keep its benchmark interest rate that low for an extended period, surprising those who have been expecting a rate hike sooner rather than later.

The Canadian dollar, which had been above par with the U.S. dollar before the bank's announcement, fell precipitously on the news, down a third of a cent to 99.36 cents US. Although no rate change was anticipated Tuesday, investors had expected a more hawkish tone from the bank with regard to raising interest rates.

The central bank said that the risks to Canada's economy were "roughly balanced" and as such there was no need for a change at this point. "[But] the global economy has slowed markedly as several downside risks ... have been realized," the bank said in its accompanying statement.

Debt troubles in Europe continue to have an effect, as does the slowdown in the U.S. and emerging markets. Canada's export-driven economy is heavily dependent on all of those markets for growth.

It was the tenth consecutive time that the central bank has decided to hold the rate, since it raised it to 1.0 per cent from 0.75 per cent in September 2010. The bank's leaders, including governor Mark Carney, meet every six weeks to discuss where to set its benchmark interest rate.

The bank says Canada's economy likely grew a modest 2.1 per cent this year - most of it in the first quarter - and will fare even worse at 1.9 per cent next year. Both numbers were 0.7 percentage points less than the bank had projected in July.

The bank also said it saw some "significant risks" with regard to its inflation outlook. Earlier this month, Statistics Canada reported that Canada's inflation rate inched higher to 3.2 per cent in September. And the core rate (which strips out volatile food and gas prices) was 2.2 per cent.

The Bank of Canada wants to keep the core rate below 2.0 per cent, and it's the first time the rate has been above that target since February 2010.

But the bank said it is confident the inflation jump will be temporary, as a weakening economy will keep it under control.

"As a result, core inflation is expected to be slightly softer than previously expected, declining through 2012 before returning to 2 per cent by the end of 2013," the bank said in its statement Tuesday.