Anopheles daciae, commonly found in eastern Europe and the Balkan States and thought to be possible carriers of malaria, has been observed in several regions of Finland.
The Central Finland town of Jyväskylä has had a sum total of 4.5 hours of sunshine so far in November.
The eyewitness, who first heard the animal splashing by the southeastern coast, said she couldn't believe her eyes.
More than 40,000 households faced blackouts overnight.
Conditions will heat up with every passing day and weekend highs will be in the 20s across the country.
Various species can be spotted in different parts of the country till early October due to warm weather in the south.
Lapland was Finland's hottest region on Monday with a measuring station in the village of Utsjoki recording 33.5 degrees celsius. A high-pressure front dominating Central and Eastern Europe is behind the drought and high temperature readings.
In Northern Ostrobothnia the floods are rising faster, and local emergency services have elicited the help of the military as a precaution, in case some of the ice dams in the riverland should need to be detonated.
The incidence of ticks at all of Turku University’s research sites in Turku as well as in Helsinki has risen over the past 20 years, and they can still active into the fall, even after periods of freezing weather. Southwestern Finland and Uusimaa have reported 29 cases of tick-borne encephalitis and some 1,500 people have contracted Lyme disease, an illness caused by ticks carrying Borrelia burgdorferi.
Swimming at the lake is not recommended at the moment, despite a major purification process in 2017.
Mild, wet weather has raised water levels in rivers and lakes around the country.
Ice cover over Finlands sea areas is very low. Experts warn that the ice is now very thin over sea, and with spring slowly arriving, the situation is not likely to improve.
The Finnish researcher says the source of southern Finland's unusually slippery roads and messy snow this winter is very likely due to warm air from the sea.
The cherry blossoms along the Aura riverbank are a huge draw for tourists and photo enthusiasts every year around mid-May. The city's head gardener said he was amazed by the sight of the flowers budding this time of year.
A fire chief in the south-west said firefighters were called to several fires a day in recent days, saying that all were caused by people who ignored warnings.
The WWF and locals report sightings of 10-15 eagles at a time in western Finland.
New research finds that ticks are not only becoming more common in Finland but incidents of the tick-borne disease Borrelia - also known as Lyme disease - has grown exponentially in the past 20 years.
Strong winds have created a picturesque wall of ice on the shore of Lake Pyhäjärv. "This often happens at this time of year on the shores of larger lakes and on the sea shore," Huutonen said, adding that there were gale force winds in the area over the weekend.
The conditions for the creation of an ice wall on the lake occur about once a decade, when the ice is thick enough and there are large variations in the daily temperatures. As the ice melts, it creates a chasm, but when it freezes again and expands, it forces the edge of the chasm upwards, creating the 'wall' effect.
Finland is continuing to heat up this summer - and nearing the all-time heat record for June.
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