Late on Sunday a cooler change slowly filtered through southern parts of South Australia, better late than never for many relived residents. Those in Ceduna on the West Coast had to put up with 45-degree heat, 19 above the November average average before a cooler change. The change was gradual but it cooled to about 30 degrees for most of the afternoon, cooler than any of the previous eight afternoons. This brought an end to six days above 40 and nine days above 35, unprecedented in the last 70 years of Novembers. Many other places in SA recorded their hottest November day in many years, such as: Kyancutta - 45 degrees, their hottest in 12 years. Snowtown - 43 degrees, their hottest in at least 11 years. Edinburgh - 41, a nine year high. Nuriootpa - 40, a 12 year high. The cooler change will only affect southern parts of the state. Anywhere north of about Woomera will exceed 40 each day until at least Friday. Adelaide and the rest of southern SA will bake in high 30s and low 40s on Wednesday and Thursday before a stronger cooler change. Wednesday and Thursday will also be extreme fire danger days as heat combines with dry, gusty northerly winds.