"Some flowers, like roses, have actually begun to blossom for a second time," said Mats Rosenberg, a biologist in Orebro, south-central Sweden.
Weather experts say this fall is on track to become one of the warmest on record in the northern part of Scandinavia.
According to Sweden's meteorological office SMHI, the average temperature measured for November so far is 12.6 degrees Fahrenheit above average.
In the Finnish town of Sodankyla, 80 miles north of the Arctic Circle, snow cover started Nov. 17, the latest date in 100 years, said Pauli Jokinen, spokesman at the Finnish Meteorological Institute.
Animals - such as stoats, hares and willow grouse - that change color with the season turned white weeks before the snows came.
"It was really very weird - ghostlike white figures darting among the yellow leaves and lichen," said Viljo Pesonen, mayor of the town of 9,000.
"They don't go by the weather conditions, time determines when they turn white. It has also made the place much darker as there has been no snow to lighten the shortening days," he said, adding that heavy rain during the day had already cleared fields of snow.
Earlier this month, World Cup Alpine skiing races were moved from Levi, Finland, to Austria because of the lack of snow.
Cross-country World Cup races in Norway last weekend had to be moved from barren ground in Beitostoelen to Sjusjoen, where at least it was cold enough for artificial snow to stick.