Country Overview For Finland
The climate in Finland is typically cold temperate; potentially subarctic but comparatively mild because of moderating influence of the North Atlantic Current, Baltic Sea, and more than 60,000 lakes. The terrain: mostly low, flat to rolling plains interspersed with lakes and low hills. For Helsinki in January the daily average maximum temperatures is 0°C with the average minimum -4°C, while in June the average maximum is 16°C with a minimum of 11°C. The wettest month for Helsinki is October with an average of 73.3mm of precipitation falling while the driest month is May with 30.3mm falling.
HISTORICAL MONTHLY AVERAGES FOR MAY
The information presented below gives detailed historical monthly average weather conditions along with exceptional weather occurrences. To maintain relevance to current weather trends the displayed information has been calculated using data collected over the past two decades. The climate profile is taken from closest available data source to Turku.
Throughout the month of May daytime temperatures will generally reach highs of around 15°C that's about 59°F. At night the average minimum temperature drops down to around 4°C, that's 39°F.
In recent times the highest recorded temperature in May has been 30°C that's 86°F, with the lowest recorded temperature -6°C, about 21°F.
The average daily relative humidity for May is around 62%.
The Heat Index is a measure of how hot it feels when relative humidity is added to actual air temperature. From this a comfort level is calculated providing categories on how heat conditions might adversely affect someone.
Comfort Levels: Given average maximum temperatures and humidity levels generally you should not anticipate any discomfort from heat (see heat index for more information).
The average monthly amount of precipitation has been recorded at around 28 mm, that's 1 inches. Throughout the month you can expect to see rain or drizzle falling on 14 days of the month, with snow falling on 1 days.
The average daily wind speed in May has been around 12 km/h, that’s the equivalent to about 7 mph, or 6 knots. In recent years the maximum sustained wind speed has reached 56 km/h, that’s the equivalent of around 35 mph, or 30 knots.
On average the month of May is affected by foggy conditions on 3 days.
YEARLY TRENDS: WEATHER AVERAGES & EXTREMES
The following charts show yearly weather trends with information on monthly weather averages and extremes.
The chart below plots the average high and low temperature for each month of the year. It also shows the maximum and minimum recorded temperatures.
The chart below plots the average monthly precipitation amount.
The chart below plots the average number of days in any month that you can expect to see rain falling.
The chart below plots the average number of days in any month that you can expect to see snow falling.
The chart below plots the average daily wind speed you can expect for any month. It also shows the maximum recorded sustained wind speed for each month.