Climate Chart of Turku, Finland

Climate overview

Temperature

Monthly mean temperatures are lowest in January, at -3.0 °C, and highest in July, at 17.8 °C. These are averages for each month, not daytime maximum temperatures, so they describe the broad temperature pattern rather than the range visitors may encounter within a day. Across the calendar months, the unweighted mean of monthly mean temperatures is 6.7 °C. It summarizes the monthly figures without weighting them by the number of days in each month.

Rain

Mean daily rainfall is lowest in March, at 0.62 mm/day, and highest in August, at 3.43 mm/day. The figures describe average amounts per day, not monthly totals, and the lower monthly mean does not guarantee rain-free days or indicate how often rain falls. The unweighted mean across the monthly daily-rainfall means is 1.66 mm/day. It provides a broad summary, but cannot show the timing or variability of rainfall on individual days.

Sunshine

Average daily sunshine reaches its highest monthly mean in June, at 13.96 hours/day, and its lowest in December, at 1.05 hours/day. These are sunshine-duration averages, not measures of daylight length, and do not promise the same sunshine on each day. The unweighted mean of the monthly daily-sunshine means is 7.42 hours/day. It offers a calendar-wide reference, while actual sunshine can vary from day to day.

Snow

Mean daily snowfall is highest in January, at 8.14 mm/day. This is an average amount per day, not a monthly total; it does not establish how many days have snowfall, snow depth, or whether snow cover is present. The unweighted mean across the monthly daily-snowfall means is 2.47 mm/day. This summarizes the monthly figures but cannot indicate snow conditions on a particular visit.