Russarö

Russarö is an island south of Hanko. The island is closed to the public as it is military area of the Finnish Defence Forces. The island hosts the five-story Russarö Lighthouse built in 1863^[1][2] and a Finnish Meteorological Institute weather station.^[3]

The Finnish 234 mm Coastal artillery in Russarö during the military exercise in the 1930s.

December 1939

On 1 December 1939, the Soviet light cruiser Kirov, accompanied by the destroyers Stremitelny and Smetlivy, approached the fortified coastal artillery battery located on the island. After a short exchange of fire, Stremitelny and Kirov were hit and the ships withdrew. Aboard the Kirov, 17 men were killed and 30 wounded.

Climate

Climate data for Hanko Russarö (1991-2020 normals, extremes 1959- present)
Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Record high °C (°F)	7.6 (45.7)	7.8 (46.0)	10.2 (50.4)	17.7 (63.9)	26.5 (79.7)	28.2 (82.8)	30.5 (86.9)	27.7 (81.9)	22.9 (73.2)	16.3 (61.3)	12.9 (55.2)	9.6 (49.3)	30.5 (86.9)
Mean maximum °C (°F)	4.8 (40.6)	3.7 (38.7)	5.9 (42.6)	11.6 (52.9)	18.8 (65.8)	21.9 (71.4)	25.0 (77.0)	23.7 (74.7)	19.4 (66.9)	14.2 (57.6)	9.6 (49.3)	6.4 (43.5)	25.9 (78.6)
Mean daily maximum °C (°F)	0.6 (33.1)	−0.5 (31.1)	1.7 (35.1)	5.9 (42.6)	11.6 (52.9)	16.4 (61.5)	20.3 (68.5)	19.8 (67.6)	15.5 (59.9)	9.8 (49.6)	5.5 (41.9)	2.7 (36.9)	9.1 (48.4)
Daily mean °C (°F)	−1.3 (29.7)	−2.6 (27.3)	−0.5 (31.1)	3.2 (37.8)	8.5 (47.3)	13.4 (56.1)	17.4 (63.3)	17.2 (63.0)	13.2 (55.8)	8.0 (46.4)	3.9 (39.0)	1.1 (34.0)	6.8 (44.2)
Mean daily minimum °C (°F)	−3.3 (26.1)	−4.6 (23.7)	−2.7 (27.1)	1.1 (34.0)	5.9 (42.6)	11.1 (52.0)	15.0 (59.0)	14.9 (58.8)	11.2 (52.2)	6.2 (43.2)	2.2 (36.0)	−0.9 (30.4)	4.7 (40.4)
Mean minimum °C (°F)	−13.0 (8.6)	−13.3 (8.1)	−9.4 (15.1)	−3.0 (26.6)	1.5 (34.7)	7.0 (44.6)	11.0 (51.8)	10.7 (51.3)	5.9 (42.6)	−0.4 (31.3)	−4.1 (24.6)	−8.5 (16.7)	−15.9 (3.4)
Record low °C (°F)	−33.6 (−28.5)	−30.6 (−23.1)	−21.2 (−6.2)	−13.6 (7.5)	−2.6 (27.3)	3.7 (38.7)	8.2 (46.8)	6.0 (42.8)	1.0 (33.8)	−6.7 (19.9)	−15.0 (5.0)	−27.3 (−17.1)	−33.6 (−28.5)
Source 1: FMI normals 1991-2020[4]
Source 2: Record highs and lows[5]