Today in newspaper weather report: "There are so widespread soil and frost in places, hut." I would say 99% of newspaper readers to the second term in this sentence (Starting at least my non-representative survey among friends a hit rate of 0 %...). So the word should not be used in freezing weather hut without further explanation really.
Although I personally do not like the term, there is a simple explanation: Before there were automatic weather stations, were the instruments (including the thermometer) situated in the so-called weather huts and 3x is read daily. . Some of these cabins are still in operation, the standardized measurement is 2 meters in height above the ground - so that the devices can be read by a small staircase is at the cottage:
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| weather huts in the garden of MeteoSwiss in Zurich: the left is a classic English cottage (at climate stations still in use today), right Wild'sche hut (in some cases to 1970 in use ). The photo was incidentally 30 October 2008, where it snowed down to the plains and in places has new October snow records were recorded. |
There are now at a height of 2 meters Frost (just in the refuge), this is sometimes referred to as hut frost. This is in contrast to the ground frost, which appropriately enough on the ground occurs.
The distinction between these two types of frost is completely useful and important. Not always when ground frost occurs, the temperature at 2 meters below 0 degrees. On clear nights that is always first to the ground cools down, this will then pass the cold to the air above. Accordingly, it is during a clear night on the floor an average of about 4 to 6 degrees colder than 2 meters (the rule applies to snow free conditions). Recent example from the current 21 clock: it was at the airport Zurich Kloten near the ground already -4.0 ° C (measured 5 cm above the grass), while in 2 m height at or +1.7 ° C warm is.
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