By Cynthia Lin 
 

U.S. Treasurys ended November with a rally, adding to an unexpected year of gains as investors sought safer bonds in the face of weak inflation.

Prices rounded out Friday's early 2 p.m. close at session highs. Benchmark 10-year notes rose 17/32 in price to yield 2.173%. The rate slipped as far as 2.16%, the lowest in more than a month. The 30-year bond rallied 30/32 to yield 2.893%. Bond yields fall when prices rise.

The market was closed Thursday in observance of Thanksgiving. While some market participants noted that subpar volume may have exaggerated the session's gains, many agreed that the broader theme of weak inflation and choppy global growth served to support U.S. government bonds.

"We're seeing that even with low yields there's still a bid to Treasurys," said David Ader, a government bond strategist at CRT Capital Group.

Friday's gains added to the 0.6% total return posted by the overall market for the month as of Nov. 26, based on Barclays' Treasury index. For the year, the market has handed owners 4.7% in total return.

The 2014 rally flies in the face of widespread expectations for a year of falling Treasury prices as investors expected a recovering U.S. economy and tightening Federal Reserve policy to put pressure on safer bonds. Instead, the 10-year yield fell as low as 1.85% in October, from just above 3% at the start of the year.

"This year has been a global yield story," said Dan Heckman, a fixed-income strategist at U.S. Bank Wealth Management. "Our yields are still measurably higher than other places that compete for global funds."

Indeed, yields on bonds backed by various nations fell to record lows in recent sessions on signs of lackluster inflation. A lack of growth in consumer prices is generally supportive of fixed-income investments, but recent readings have the extra weigh of raising expectations that monetary policy authorities will deliver further easing measures to fight off disinflation.

Germany, the eurozone's largest economy, saw its inflation rate slip to 0.5% in November. That was followed up with the eurozone reporting a mere 0.3% rise in consumer prices in November from a year ago. Japan also reported a slowdown in inflation in October for the third consecutive month.

Germany's 10-year bund hit a record low of 0.65%, while Japan's two-year yield fell below zero for the first time ever. France saw its 10-year yield slip below 1% for the first time.

Bond traders said that is having a gravitational pull on U.S. Treasury yields, even as the U.S. economy shows signs of improvement and the Fed is expected to start tightening policy in 2015.

"It feels like Treasury yields are being sucked into a black hole of negative yields," said William O'Donnell, rates strategist at RBS Securities. "As long as rate differentials make Treasurys look like a bargain to yield-starved global investors, it's probably going to be a herculean challenge to push U.S. rates up and keep them up given what's going on elsewhere."

Indeed, many analysts had expected the U.S. 10-year yield to end the year above 3% on the back of an improving labor market and gradual end of the Fed's bond-buying program. Over the past few months, many forecasters have lowered their year-end calls to around 2.3% to 2.5%.

 
COUPON   ISSUE    PRICE     CHANGE     YIELD    CHANGE 
3/8%     2-year  100  1/32  up 2/32    0.476%   -4.0BP 
7/8%     3-Year  100  1/32  up 5/32    0.862%   -5.0BP 
1 3/4%   5-year  100  1/32  up 9/32    1.493%   -5.9BP 
2%       7-Year   99 28/32  up 13/32   1.892%   -6.4BP 
2 1/4%   10-year 100 22/32  up 17/32   2.173%   -6.1BP 
3%       30-year 102  4/32  up 30/32   2.893%   -4.7BP 
2-10-Yr Yield Spread: +169.7 BPS Vs +171.8 BPS 
 
Source: Tradeweb/WSJ Market 
 
 

Write to Cynthia Lin at cynthia.lin@wsj.com