Nuuksio has the highest rainfall in all of Finland. The climate in Nuuksio is also affected by the fractionate terrain, causing friction increasing rainfall. In 1981 the rainfall in Nupuri was measured as 1,109 millimetres, an all-time record in Finland. In southern Espoo the area of Suurpelto is slightly cooler than its surroundings. Although Espoo is the second-largest city in Finland, its meteorological averages have not been measured. At the weather stations in the neighbouring municipalities the average temperature from 1981 to 2010 was about 5 to 6 degrees Celsius. The coldest time of the year was from January to February and the warmest time was from July to August. The temperature differences between the seasons grow smaller when moving out towards the sea. On the coast and in the archipelago the temperature rarely rises above 30 degrees or falls below -20 degrees. The average rainfall is from 600 to 700 millimetres per year. The driest season is in springtime and the rainiest season is in August and from October to December. The most of the rainy days occur in autumn. The Finnish Meteorological Institute has eight outposts in Espoo: Friisilä, Kivenlahti, Kytö, Leppävaara, Luukki, Nuuksio, Otaniemi and Tapiola. Of these, Nuuksio and Tapiola are weather outposts, taken into use in the 2010s. The Nuuksio outpost is located in a sparsely populated and fractionate lake ridge 90 metres above sea level. The Tapiola outpost is located in a suburb on the coast of the Gulf of Finland 6 metres above sea level. Snow conditions On average, snow first falls on Espoo after Christmas and melts away from late March to early April. The snow conditions vary more on the coast than inland. On some years, the snow may last up to five months, while on some years, there might be hardly any snow during the entire winter. Lows coming from the southwest carry temperate air which can keep the snow layers thin or even melt the snow away. Winds The dominant wind direction sector in Espoo is south-west, like in Finland in general. The sea wind has a large effect on the local winds on the coast, and can even create its own wind field. It can change the direction and speed of the basic wind on the coast for many times during the same day. Particularly in springtime and early summertime the sea wind keeps the archipelago and coastline