Nearly all of South Australia, including Adelaide, has begun its driest week in two months. For Adelaide and further north it has not rained since last Saturday and it is unlikely to rain again until next Saturday night. Cold fronts, typically two per week in winter, are at their weakest since June. The polar jetsream has slipped south, allowing a high pressure system to reside over the state, keeping fronts south of about Adelaide. For Adelaide and many other places early-June was the last time there had been a dry week. Port Augusta, in the north, has just had its first rain-free week since April. Karoonda, in the Mallee, also last had a dry seven-day spell in the week leading up to Anzac Day and is unlikely to see rain until Saturday night. Also in for a dry week, Wudinna, on the West Coast, has not had a dry seven days since May. Even where some rain is likely in the next few days it will almost certainly end up being the driest week in two months. Only Kangaroo Island, southern parts of the peninsulas and the southeast can expect some rain during the week, but only light showers. Mt Gambier should be one of the state's wettest places this week. The Lower South East town has picked up two millimetres since Saturday and should gain about five millimetres or less between now and Saturday night, making this its driest week since early June. This dry spell is causing dam levels to drop for the first time since early winter when the Adelaide catchment was only 56 percent of capacity. The wettest June/July in 10 years, 199mm (about 40mm more than average), has taken the catchment level to 88 percent, the highest in four years. Another effect of the dry week is for gardens, parks and sporting grounds to firm and recover, a relief for many.