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Average fixed mortgage interest rates had their biggest one-week jump of the year this week, bringing them to levels not seen since early May.

The increases followed several ho-hum weeks with rates little changed.

The average interest rate on a 30-year, fixed-rate mortgage this week was 4.23 percent, compared with 4.12 percent last week, according to Freddie Mac’s weekly survey. A year ago, the rate on that mortgage was 4.5 percent.

On a 15-year, fixed-rate mortgage, this week’s average interest rate of 3.37 percent compared with 3.26 percent last week and 3.54 percent in the same week a year ago.

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