Clare Valley climate uncovered

A number of Clare Valley producers have explained how their region's climate is varied enough to grow both Riesling and Shiraz.
At a tutored tasting held at London's Australia House last week, Jeffrey Grosset of Grosset Wines explained that decades of weather data on the region were next to useless and claimed that ex-Petaluma boss Brian Croser once said that this was because the weather station in Clare was on a concrete slab behind the post office'. More recent data, Grosset added, showed the weather to be cooler than previously recorded, but the new weather data say that it's not hot enough to ripen Cabernet, but it's too hot for Riesling, so both reports are flawed'.