New research reveals Dunedin's one of the most stable places in the country in terms of year-round accommodation prices.

Local hotels are among the most affordable in the South Island.

And accommodation overall in the city varies just 21% between the cheapest and most expensive months.

That's a small difference compared to other centres.

In Oamaru, prices vary as much as 74%.

Otago's the most expensive region to stay in, thanks to Arrowtown, Wanaka and Queenstown prices.

The average hotel costs $234 per night.