Photo Gary Walton
- 2018 topsy-turvy weather continues with a heatwave in Sweden and a coldwave in Australia.
- Last month Pakistan experienced the world's hottest April day on record, with temperatures peaking at 122.4F (50.2C)
- The temperature of the Arctic over the whole region appears to be the warmest on record for the time of year, dating back to at least 1958.
- Holland and Britain had their hottest April Day ever with the UK also experienced it's hottest May bank Holliday ever.
- The crazy weather of 2018 in the US took another turn away from the global warming trend when NOAA claimed the U.S. had its coldest April in more than 20 years
- Also in April temperatures crept up to levels humans should not have to endure when India's miserable heatwave continued with the mercury approaching 50 deg C or 122 deg F.
Some parts of Sweden could have temperatures above 30C (86+ deg F) this week.
The heatwave from Finland is expected to stick around until Wednesday, according to national weather agency SMHI, with unusually high May temperatures in almost the whole of Sweden.
"We'll have temperatures far above normal in all of the country if you compare to statistics between 1961 and 1990," said SMHI meteorologist Linus Dock.
Only in the far north of the Lapland mountains is the mercury expected to stay at normal levels.
"It's not very uncommon that we get around 25C or 30C in May.
But if it climbs above 30C it is unusually warm," said Dock.
Skelleftea and Pajala in northern Sweden had 25C and 20C, respectively, on Sunday.
The west coast of Sweden could get over 30C on Monday, and the rest of the country on Tuesday.
Meanwhile, temperatures in Adelaide dipped to just 5.9C at 4am, making it the coldest minimum the city's experienced so far this year.
Elsewhere in the state, residents braved near-freezing conditions, with Keith in the South East recording just 1C and Snowtown dropping to 1.2C.
In the Riverland, Loxton recorded 1.8C and Renmark was a slightly warmer 2.3C.
Residents in Roxby Downs woke to temperatures at 2.2C. Bureau of Meteorology senior forecaster Paul Bierman said clear skies overnight combined with a "dry atmosphere" contributed to the cool conditions.
"Tomorrow (Tuesday) morning shouldn't be as cold (because) there is a front coming up from the south-west which is moving through Adelaide (bringing showers)," he said.
Mr Bierman said some regional parts of SA, including the Eyre Peninsula, experienced areas of fog this morning, which forms during cool conditions, light winds and clear skies.
"There were little patches (of fog) around Adelaide but nothing extensive," he said.
The cold weather comes on the back of an unusually warm March and April, with the mercury climbing into the high 30s and 40s.
In May, Adelaide can expect an average minimum of 10.4C and maximum of 18.6C.
Mr Bierman said there was some shower activity expected this week, however, the forecasters are not predicting a "particularly wet event".