Altnaharra () is a small hamlet in Sutherland in the Highland region of northern Scotland. The hamlet is on the A836 road, close to its junction with the B873. The nearest villages are Lairg and Tongue. in the area include Loch Naver and Loch Eriboll.
The name Altnaharra is derived from the Scottish Gaelic Allt na h-Eirbhe, meaning Stream at the boundary wall. This is named after a stream that flows through the hamlet.
Altnaharra is one of only two British locations where the string sedge plant can be found. The area north of the hamlet has been designated a site of special scientific interest for its internationally important range of wetland vegetation.
Altnaharra parish church was built between 1854 and 1857 by Hugh Mackay as a Free Church. It subsequently became part of the Church of Scotland, but no regular services are presently conducted in the building. Altnaharra is now part of the parish of Altnaharra and Farr, served by the church at Strathnaver.
On 20 March 2009, it was recorded as the warmest place in the UK, at , which was the station's warmest recorded March temperature and possibly the first time the station had recorded the warmest UK temperature. The station also reported the equal warmest national temperature of , with Tain on 20 January 2020. On 19 June 2020, the station had both the warmest temperature, , and the coldest temperature, , reported anywhere in the United Kingdom on that day. The March 2009 temperature was beaten on 25 March 2017 when the station recorded . Also on 26 May 2017, the station recorded its highest May temperature of , beating the previous recorded on 27 May 2012. On 8 January 2010, the temperature dipped to , the coldest temperature recorded in the UK since 1995. On 3 November 2015 the warmest November temperature of was reached, followed by on 17 December 2015 being the warmest December temperature on record at the weather station. On 25 January 2016, the highest January temperature of was reached, being surpassed on 28 January 2024. On 24 September 2020, Altnaharra reported which was the lowest reported September temperature at this station, as well as being the coldest in the UK since 1997.
Altnaharra has an oceanic climate ( Cfb) with short, mild summers and long, cool winters. Precipitation occurs regularly year round.
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