Germany's central bank sharply cut its 2013 economic growth forecast to 0.4% on Friday, while poor industrial production figures underlined expectations of a weak winter for Europe's biggest economy.
The Bundesbank cut its outlook for gross domestic product growth next year from the 1.6% it predicted in June. It also lowered its forecast for 2012 to 0.7% from 1%.
That put the central bank's outlook well below the government's prediction of 0.8% growth this year and 1% growth in 2013.
However, the Bundesbank forecast a rebound to 1.9% growth in 2014 if the debt crisis in the 17-country eurozone does not escalate further and uncertainty among investors and consumers eases.
"It is also quite conceivable that the euro area will recover sooner and the world economy will accelerate faster than assumed in this projection," the Bundesbank's president, Jens Weidmann, said in a statement. "In this case, the German economy may be expected to utilise the additional growth opportunities."
Also on Friday, Germany's economy ministry said that industrial production was down 2.6% in October compared with the previous month, a far worse performance than the flat reading economists expected. It already declined 1.3% in September, though that was revised up from the 1.8% initially reported.
The decline was led by a 4.3% drop in production of investment goods such as factory machinery and a 5.3% decrease in construction output. In year-on-year terms, overall production was down 3.7%.
Recent data on the export-heavy German economy have presented a sometimes contradictory picture; on Thursday, industrial orders figures for October came in far above expectations, gaining 3.9% on the month on the strength of healthier foreign demand. Business confidence turned upward in November after six months of declines.
Indicators underline "a fundamental negative dynamic" at the end of this year but also point to "a moderate economic acceleration from the beginning of 2013", said Alexander Koch, an economist at UniCredit in Munich. One factor in the poor industrial production figures for October was high car production in the previous months as carmakers cancelled planned summer holiday shutdowns at production sites, Mr Koch said.