we present ways to protect plants from frost. Today we’ll take a step back and look at the meteorological conditions that lead to frost and ground freezing.
conceptual unravelling
First, let’s look at the terms us: When we talk about ground frost , we are referring to the temperature conditions on the ground or just above it. The temperature is measur with a sensor that is mount five centimeters above the grass.
The sensor is not protect from sunlight
and is not ventilat. As a result, the measur values during the day are not very meaningful.
As soon as ground frost is expect between March 15 and October 31 , MeteoSwiss issues a level 2 warning. The following terminology is us:
Minimum temperature at 5 cm above ground 0 to -4 degrees: moderate ground frost
Minimum temperature at 5 cm above ground below -4 degrees: severe ground frost
Lowest temperature near the ground overnight into today – in German-speaking Switzerland there was widespread severe ground frost.
Lowest temperature near the ground overnight into today – in taiwan phone number library German-speaking Switzerland there was widespread severe ground frost.
However, when frost is mention, the statement refers to the standard measurement height of two meters. The nighttime cooling is always strongest directly at the ground, and the temperature increases with altitude. Accordingly, less low temperatures are measur at this altitude:
Lowest temperature overnight today at the standard measuring
height of two meters. Frost was widespread, only on Lake Geneva and partly in Ticino did the temperatures remain above freezing.
Lowest temperature overnight today at the standard measuring what were the biggest challenges at the beginning and what problems did you have to overcome? height of two meters. Frost was widespread, only on Lake Geneva and partly in Ticino did the temperatures remain above freezing.
The increase in temperature with altitude is the reason why ground frost can aero leads occur even when the air temperature at a height of two meters is above 0 degrees.
Temperature curve at 2 m and 5 cm (top) and sunshine duration (bottom) at Zurich-Kloten Airport. In the evening, there is a rapid and significant drop in temperature near the ground. At a height of two meters, this is delay and less pronounc. As a rule of thumb, on a clear night, the temperature at five centimeters is about five degrees lower than at the standard measurement height of two meters. The nighttime rise in temperature near the ground is due to high cloud fields passing through.
Temperature curve at 2 m and 5 cm (top) and sunshine duration (bottom) at Zurich-Kloten Airport. In the evening, there is a rapid and significant drop in temperature near the ground. At a height of two meters, this is delay and less pronounc. As a rule of thumb, on a clear night, the temperature at five centimeters is about five degrees lower than at the standard measurement height of two meters. The nighttime rise in temperature near the ground is due to high cloud fields passing through.
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