By Dan Strumpf 

Stocks declined on Friday, capping a rocky week for investors, despite a stronger-than-expected jobs report that signaled continued health in the U.S. economy.

Many traders focused on an unexpectedly weak reading on wage growth, which somewhat offset the speedy clip at which employers added new jobs last month. The data suggested the Federal Reserve was likely to remain patient with any increase in interest rates, widely expected later this year, investors said. Snowballing losses in European markets also weighed down trading in the U.S., traders said.

The Dow Jones Industrial Average fell 141 points, or 0.8%, to 17770 in afternoon trading, while the S&P 500 declined 14 points, or 0.7%, to 2048. The Nasdaq Composite Index dropped 23 points, or 0.5%, to 4713.

The yield on the benchmark 10-year Treasury note fell to 1.955% Friday compared with 2.016% Thursday. Bond yields fall as prices rise.

The Labor Department said the U.S. added 252,000 jobs in December, surpassing the 240,000 gain forecast by economists in a Wall Street Journal survey. The unemployment rate fell to 5.6%, its lowest level since June 2008. Employers added 2.95 million jobs last year, the highest level since 1999.

However, the report also said average hourly earnings in December fell from the prior month and were up just 1.7% from a year ago. The weak wage growth underscored how individual workers remained under stress despite the extent of the U.S. economic recovery.

U.S. stocks were also knocked lower by steepening losses in European markets, after news that Spain's Banco Santander SA would raise $8.88 billion in capital prompted a selloff in banking stocks. The Stoxx Europe 600 index closed 1.3% lower on Friday, capping a volatile week.

"The really strong labor report highlights the continued progress economically in the U.S., but you still have this lingering concern about Europe," said Joe Spinelli, head of Americas single-stock trading at Deutsche Bank.

Friday's losses affected nearly all corners of the stock market. Financial companies posted the biggest declines, with S&P 500 financial firms off 1.2% in afternoon trading. Industrial companies shed 1.1%.

Investors were focused on what the labor report means for the timing of any interest-rate increase by the FedThe sizable number of jobs added last month means the Fed is likely to be comfortable raising rates later this year, though weak wage growth might give the central bank some pause.

Despite the rebounding U.S. economy, investors are kicking off 2015 with a laundry list of worries, from anemic economic growth in Europe and Japan to renewed political tumult in Greece and the impact of tumbling oil prices. Those concerns have many investors bracing more limited gains and wider swings in stocks this year following an 11.4% increase in the S&P 500 in 2014.

Investors got a taste of higher volatility this week. The S&P 500 tumbled 2.7% during the first three sessions of the year, marking the worst start to a new year since 2008. Then, a 3% rally carried the broad-market benchmark back into positive territory for the year through Thursday. With Friday's loss, the S&P 500 is down 0.3% for 2015 while the Dow is down 0.6%.

"It feels to us like it will be a solid year for equity returns, but we think there is a very high wall of worry that the market is going to have to climb," said Michael Fredericks, portfolio manager of the $10-billion BlackRock Multi-Asset Income Fund. Among his concerns: the tumble in oil prices, high stock valuations and the high chance of a rate increase by the Federal Reserve this year.

Mr. Fredericks, whose fund invests in both stocks and bonds, said he pared his equity exposure going into the year. "I think there's a lot to worry about," he said.

Fed-funds futures, used by investors and traders to place bets on central bank policy, showed such bettors see a 16% likelihood of a rate increase at the Fed's June meeting, compared with 20% right before the jobs report. The odds were up from 3.9% a month ago.

Some traders attributed Friday's declines to little more than taking of profit following the two-session rally earlier in the week. Friday's report alone wasn't enough to change investors' timeline for when the Fed will raise rates, said Brian Fenske, head of sales trading at brokerage ITG.

"We've had a very sharp rally in the last few days," Mr. Fenske said. "You just got a big economic data point that the market is still digesting...People are still pretty comfortable with their forecast for when the Fed will raise rates."

Crude-oil futures pared their early steep losses, helping energy stocks to recover. Benchmark crude on the New York Mercantile Exchange was recently down 0.6% to $48.51 a barrel.

The dollar tumbled against the yen and the euro, reversing gains. In early afternoon trading, the dollar was down 1% against the yen. The euro climbed 0.4% to $1.1833, rising from its lowest level against the U.S. currency in nine years.

Gold prices rose 0.9% to $1218.90 an ounce.

Among individual stocks, Bed Bath & Beyond Inc. reported a 5% decline in third-quarter profit. Sales fell below the Wall Street consensus. Shares declined 6.8%.

Nelson Peltz's Trian Fund Management LP has launched a proxy fight against DuPont Co. to add four directors to the company's board. DuPont shares fell 1.5%.

Saumya Vaishampayan and

Min Zeng

contributed to this article

Write to Dan Strumpf at daniel.strumpf@wsj.com

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