Climate - Hanko (Finland)

The climate of Hanko is Baltic, that is, moderately continental, with cold winters, during which the average temperature is a few degrees below freezing, and mild to pleasantly warm summers.
Hanko (Hangö in Swedish) is located in the south-western tip of Finland, in the area where the climate is (relatively) milder.
The white nights, when it doesn't get completely dark even at midnight, occur from May 13th to July 31st.
In winter, there can be cold spells of arctic origin, while in summer, there can be short hot periods. The cold record is -34 °C (-29 °F), the heat record is 31 °C (88 °F).
The average temperature of the coldest month (February) is of -4.1 °C (25 °F), that of the warmest month (July) is of 17.3 °C (63 °F). Here are the average temperatures.

Precipitation amounts to 635 millimeters (25 inches) per year: so, it is at an intermediate level. It ranges from 30 mm (1.2 in) in the driest month (April) to 80 mm (3.1 in) in the wettest (August). Here is the average precipitation.

The sea temperature ranges between 1 °C (34 °F) and 17 °C (63 °F). So, it never becomes warm for swimming. Here are the average sea temperatures.

Best Time

The best time to visit Hanko is the summer, from June to August, since it is the mildest season. However, you must take into account some rainy days and a bit of cold at night.