US average rate on 30-year loan at 4.28 pct.

Average U.S. rates on fixed mortgages rose slightly this week, staying near three-month lows.

Here's a look at rates for fixed and adjustable mortgages this week and over the past year:

	Current avg.	Last week	52-week high	52-week low
30-year fixed	4.28	4.23	4.58	3.31
15-year fixed	3.33	3.31	3.60	2.61
5-year adjustable	3.07	3.05	3.28	2.56
1-year adjustable	2.63	2.64	2.71	2.52
All values in percentage points
Source: Freddie Mac Primary Mortgage Market Survey