Most mortgage rates remained relatively stable, with just a slight bump of 1 to 2 basis points (a basis point equals 1/100 of a percent) and three notable exceptions. One of the largest one-day decreases seen in recent memory was offset by two of the largest.

The 30-year fixed jumbo rate nosedived 17 basis points to 4.43%. For home shoppers or current owners considering an adjustable-rate mortgage, the news was not as pleasant. The 5/1 ARM rate skyrocketed 20 basis points to 3.36%, followed closely by the 5/1 ARM refi loan, which jumped 14 points.

Here are all of today's average mortgage rates across the U.S., along with where they stood a month ago.

Mortgage Type

Mortgage Rates Today

Mortgage Rates 1 Month Ago

30-year fixed jumbo

4.43%

4.39%

30-year fixed

3.87%

3.85%

15-year fixed

3.09%

3.05%

30-year fixed refinance

3.84%

3.85%

15-year fixed refinance

3.07%

3.07%

5/1 ARM

3.36%

3.11%

5/1 ARM refinance

3.39%

3.27%

Data source: Bloomberg. National average rates, which may include points.

Ah, the good old days. At this time last year, mortgage rates were at historically low levels. For some perspective, here are the average mortgage rates from May 2016.

Mortgage Type

Mortgage Rates, May 2016

30-year fixed

3.60%

15-year fixed

2.84%

5/1 ARM

2.81%

Data source: Federal Home Loan Mortgage Corporation (Freddie Mac). Rates do not include points.

For current homeowners looking into a home equity line of credit (HELOC) or equity loan, the strong housing market continues to work wonders as both stayed the course. HELOC rates still sit at 5.28%. Equity loan rates were also stable at 5.27%. Both loans remain below last month's rates, when they were at 5.30%.