Average fixed mortgage rates in the U.S. edged up in the latest week, remaining around lows for the year, according to mortgage-finance company Freddie Mac (FMCC).

Freddie Mac Chief Economist Frank Nothaft said in a statement Thursday that nonmanufacturing-activity and factory-orders data released in the latest week "signal steady economic growth in the third quarter of the year."

For the week ended Thursday, the 30-year fixed-rate mortgage averaged 4.14%, compared with 4.12% a week earlier and 4.40% a year earlier. Rates on 15-year fixed-rate mortgages averaged 3.27%, compared with 3.23% the previous week and 3.43% a year earlier.

Five-year Treasury-indexed hybrid adjustable-rate mortgages, or ARMs, on average, were at 2.98%, compared with 3.01% the previous week and 3.19% a year earlier. One-year Treasury-indexed ARM rates on average were 2.35%, compared with 2.38% the previous week and 2.62% a year earlier.

Subscribe to WSJ: http://online.wsj.com?mod=djnwires