Utö (Finland)

Island in Pargas, Finland

For other uses, see Utö (disambiguation).

Utö Utö Lighthouse

Utö (Finland Swedish: [ˈutøː]) is a small island in the Archipelago Sea in the Baltic Sea and belongs to Finland's Pargas municipality. It is the southernmost year-round inhabited island in Finland. Utö has an area of 0.81 square kilometres (5⁄16 square mile) and the population was c. 40 (as of 2005[update]).

## Name

[edit]

The name of the island, Utö, means "outer island" in Swedish.[citation needed]

## Description

[edit]

This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. (March 2025) (Learn how and when to remove this message)

|

The island has a lighthouse, pilot station, a small guest harbour, a shop and a post office. The island is also known from the marine weather observations that began in 1881.[1] Due to the remoteness of the island, the island has its own local school. In former times, the Finnish Defence Forces kept a small station on the island, but left the island in 2005. The island is also known as the first rescue station of the Estonia disaster in September 1994, and also helped rescue the survivors of the SS Park Victory sinking.

The Utö lighthouse is painted to resemble the signal flag "H", indicating the maritime pilot station. Its light signal is four short flashes, the same as the Morse code "H".

## Climate

[edit]

The annual average temperature (1981–2010 data) at Utö is 6.5 °C (43.7 °F), with mean annual precipitation 549 mm (21.61 inches). Average snow-covered period last from 23 January to 15 March.[2] The open sea areas around Utö are covered by ice only approximately every five years.[3]

Utö has a humid continental climate (Dfb) (0˚C, 32˚F isotherm) or an oceanic climate (Cfb) (-3˚C, 26,6˚F isotherm) with mild summers and moderately cold and relatively long but late winters compared to the nearby southern mainland Finland because of seasonal lag caused by the Baltic Sea.

Climate data for Utö (1991-2020 normals, records 1959-present, snowy days 1996-2023)

Month  | Jan  | Feb  | Mar  | Apr  | May  | Jun  | Jul  | Aug  | Sep  | Oct  | Nov  | Dec  | Year
Record high °C (°F)  | 7.7
(45.9)  | 6.7
(44.1)  | 11.6
(52.9)  | 15.9
(60.6)  | 24.3
(75.7)  | 25.9
(78.6)  | 29.2
(84.6)  | 27.1
(80.8)  | 22.3
(72.1)  | 17.0
(62.6)  | 12.8
(55.0)  | 9.2
(48.6)  | 29.2
(84.6)
Mean maximum °C (°F)  | 5.1
(41.2)  | 3.9
(39.0)  | 5.2
(41.4)  | 10.3
(50.5)  | 17.1
(62.8)  | 20.4
(68.7)  | 23.9
(75.0)  | 23.3
(73.9)  | 19.1
(66.4)  | 14.0
(57.2)  | 9.4
(48.9)  | 6.7
(44.1)  | 24.6
(76.3)
Mean daily maximum °C (°F)  | 1.4
(34.5)  | 0.2
(32.4)  | 1.8
(35.2)  | 5.6
(42.1)  | 10.7
(51.3)  | 15.6
(60.1)  | 19.8
(67.6)  | 19.6
(67.3)  | 15.3
(59.5)  | 9.9
(49.8)  | 5.9
(42.6)  | 3.5
(38.3)  | 9.1
(48.4)
Daily mean °C (°F)  | −0.1
(31.8)  | −1.4
(29.5)  | 0.0
(32.0)  | 3.2
(37.8)  | 7.9
(46.2)  | 13.0
(55.4)  | 17.3
(63.1)  | 17.4
(63.3)  | 13.4
(56.1)  | 8.4
(47.1)  | 4.6
(40.3)  | 2.0
(35.6)  | 7.1
(44.9)
Mean daily minimum °C (°F)  | −1.8
(28.8)  | −3.1
(26.4)  | −1.6
(29.1)  | 1.4
(34.5)  | 5.8
(42.4)  | 11.1
(52.0)  | 15.4
(59.7)  | 15.7
(60.3)  | 11.9
(53.4)  | 7.0
(44.6)  | 3.2
(37.8)  | 0.5
(32.9)  | 5.5
(41.8)
Mean minimum °C (°F)  | −9.1
(15.6)  | −10.3
(13.5)  | −7.0
(19.4)  | −2.1
(28.2)  | 2.1
(35.8)  | 7.5
(45.5)  | 12.0
(53.6)  | 11.9
(53.4)  | 7.8
(46.0)  | 1.4
(34.5)  | −2.1
(28.2)  | −5.0
(23.0)  | −12.5
(9.5)
Record low °C (°F)  | −31.3
(−24.3)  | −28.0
(−18.4)  | −21.7
(−7.1)  | −15.3
(4.5)  | −1.2
(29.8)  | 0.8
(33.4)  | 7.0
(44.6)  | 7.4
(45.3)  | 0.6
(33.1)  | −4.5
(23.9)  | −9.9
(14.2)  | −22.4
(−8.3)  | −31.3
(−24.3)
Average precipitation mm (inches)  | 44
(1.7)  | 34
(1.3)  | 32
(1.3)  | 24
(0.9)  | 29
(1.1)  | 42
(1.7)  | 48
(1.9)  | 58
(2.3)  | 57
(2.2)  | 66
(2.6)  | 62
(2.4)  | 57
(2.2)  | 553
(21.6)
Average precipitation days (≥ 0.1 mm) | 17  | 15  | 12  | 10  | 9  | 10  | 9  | 12  | 12  | 16  | 18  | 19  | 159
Average snowy days  | 16.0  | 16.9  | 14.0  | 2.3  | 0.0  | 0.0  | 0.0  | 0.0  | 0.0  | 0.1  | 3.4  | 10.3  | 63.1
Average relative humidity (%)  | 86  | 86  | 85  | 83  | 82  | 82  | 81  | 80  | 81  | 82  | 85  | 86  | 83
Mean monthly sunshine hours | 37  | 61  | 152  | 222  | 318  | 315  | 326  | 272  | 188  | 98  | 34  | 26  | 2,049
Source 1: FMI climatological normals for Finland 1991-2020[4] Weatheronline.co.uk[5]
Source 2: record highs and lows[6]

## See also

[edit]

* Bogskär
* Märket
* Nuorgam
* Virmajärvi

## References

[edit]

1. ^ "Utö Atmospheric and Marine Research Station: Observations". Finnish Meteorological Institute. Retrieved 26 January 2013.
2. ^ "Utö Climate statistics". Finnish Meteorological Institute. Retrieved 26 January 2013.
3. ^ Seinä, A; Peltola, J. (1991). Jäätalven kestoaika ja kiintojään paksuustilastoja merialueilla 1961-1990 / Duration of the ice season and statistics of fast ice thickness along the Finnish coast 1961-1990. Finnish Institute for Marine Research: Finnish Marine Research 258.`{{cite book}}`: CS1 maint: publisher location (link)
4. ^ "FMI normals 1991-2020" (in Finnish). fmi.fi. Retrieved 11 April 2023.
5. ^ "Weatheronline.co.uk".
6. ^ "Taulukkotilasto: Parainen Utö" (in Finnish). FMI. Retrieved 11 April 2023.

## External links

[edit]

Media related to Utö, Finland at Wikimedia Commons

* Utö Island Website (in Swedish, Finnish, and English)
* Utö Atmospheric and Marine Research Station

59°47′N 021°22′E﻿ / ﻿59.783°N 21.367°E﻿ / 59.783; 21.367

* Finland portal
* Islands portal

* v
* t
* e

Inhabited islands in the Baltic Sea

Denmark|

* Bornholm
* Ertholmene
* Falster
* Lolland
* Møn

Estonia|

* Abruka
* Aegna
* Hiiumaa
* Kassari
* Kesselaid
* Kihnu
* Kõinastu
* Manilaid
* Mohni
* Muhu
* Naissaar
* Osmussaar
* Prangli
* Ruhnu
* Saaremaa
* Väike-Pakri
* Vilsandi
* Vormsi

Finland|

* Archipelago Sea Islands
* Åland
* Utö
* Bergö
* Björkö
* Eugmo
* Haapasaari
* Hailuoto
* Kallankari Islands
* Kaskinen
* Kaunissaari
* Kimitoön
* Kotkansaari
* Kulosaari
* Laajasalo
* Larsmo
* Lauttasaari
* Mustikkamaa
* Pellinki
* Replot
* Suomenlinna

Germany|

* Dänholm
* Fehmarn
* Hiddensee
* Poel
* Rügen
* Ummanz
* Usedom

Poland|

* Uznam
* Wolin

Russia|

* Kotlin

Sweden|

* Alnön
* Blekinge archipelago
* Fårö
* Gotland
* Härnön
* Hertsön
* Holmön
* Öland
* Pitholmen
* Seskarö
* Stockholm Archipelago
* Hallonstenarna
* Stora Karlsö

*[c.]: circa
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template