Early frosts

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  • A ground frost occurs when the grass or road surface temperature drops below 0C as well as below the dew point. Photo: Rui Vieira (PA Archive)

    An example of hoar frost. Photo: Matthew Vincent (PA Archive)

    The Cairngorms, where snow is already beginning to settle as temperatures drop. Photo: David Cheskin (PA Archive)

  • Early frosts
    22.09.2012 15:01

     

    As summer seems to be on its way out we have already had some unusually cold nights, particularly in Scotland. In the past week temperatures have dropped below 0C on more than one occasion. In addition to this in some parts of Scotland the road surface temperature dropped below 0C as well as below the dew point causing a ground frost to develop. 

    On Thursday night (21st September) temperatures dropped below 0C for the first time since mid May. In Blaran, Argyll and Bute air temperatures dropped to -1C and road temperatures hit 0C. On some roads in Tyndrum, Stirling a hoar frost was visible on the roads. Then on Friday night 14 road sites dropped below 0C, most in Scotland and a few in the uplands of northern England. The lowest air temperature was recorded at Abington, South Lanarkshire at 06:50am on the 23rd when it dropped to -1C. The first that occurred on 21st September was the first since 11th May which is believed to be one of the shortest summer gaps between road frosts.

    These temperatures are unusually low for the time of year. In comparison to 2012 the first ground frost in 2011 was on 14th October and in 2010 on the 17th October. 

    During the next week it will remain chilly with maximum temperatures unlikely to reach above 17C. However, temperatures should refrain from dropping below 0C apart from over the highest peaks in Scotland.  

    By: Sally Webb