May brought more rain than usual throughout Finland. The heaviest precipitation came in central and eastern areas as well as parts of southern Lapland, which received more than twice the average rainfall for the month.
The Finnish Meteorological Institute (FMI) says that many places around the country received rainfall amounts that occur less than once a decade according to long-term averages. The weather station in Alavus, Southern Ostrobothnia, recorded the highest rainfall amounts since it was set up more than half a century ago.
Some spots received rainfall totals that typically happen three times a century at most – as scientists note that Finland's weather is gradually becoming wetter due to climate change.
Wettest in the east
For the spring season of March through May, precipitation of all types varied from around 70 millimetres in the far north to some 200mm in eastern Finland. There, the municipalities of Lieksa and Savonlinna received the most plentiful rains in 50 years.
May's biggest rain total, 121.8mm, was measured at Koli National Park in Lieksa, eastern Finland. This hilly area also had the highest total for the three-month period, 220.9mm.
The heaviest rainfall in a single day was recorded in Sysmä, south-central Finland, where 33.3mm fell on 11 May.
Meanwhile the driest places in May were in south-western coastal areas and eastern Lapland.
Heat records in the west, frosty in Lapland
Mean temperatures for May were close to the long-term average. They were around 8-10 degrees Celsius in southern and central Finland and about 4-8 degrees up north.
The highest reading of 27.8 degrees was recorded on 20 May in Kokemäki, southwest Finland, matched the following day in Turku's Artukainen district, about 100 km further south.
The mercury exceeded 25 degrees – "hot" by Finnish standards – somewhere in the country on six days during May. That was twice as many as usual.
The month's coldest temperature, -11.8 degrees, was measured on 3 May at a weather station on Saana Fell in Kilpisjärvi on the far northwestern border with Norway.