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First frost
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03-10-2006 11:09am#1
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Hill Billy wrote:Daily data for Dublin Airport on met.ie has the Min Temp as 3.5C.
That min is the AIR min, which is recorded in a screen 1.2m (4ft) above ground.
The min I mentioned is the GRASS min, which was exactly -1.9C (I rounded it to -2C and is also mentioned on the daily data page). This is the min measured by an exposed thermometer 5cm (2 inches) above ground and touching the grass tips.
When a slight frost is mentioned, it is usually refering to grass temp falling below zero. Usually in my experience ia frost isn't really visible unless grass temp falls below -3C which is probable is some sheltered spots or frost hollows tonight.0 -
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