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In Chicago and other locations of similar climate, the frost line is six feet, or 1.8 meters. In near- Arctic and Antarctic locations, the frost line is so deep that it becomes yearA year is the time between two recurrences of an event related to the orbit of the Earth around the Sun. By extension, this can be applied to any planet: for example, "Martian year". Seasonal year A seasonal year is the time between successive recurrences-round permafrostIn geology, permafrost is soil that stays in a frozen state for more than two years in a row. The extent of permafrost can vary as the climate changes, approximately 20% of the Earth's land mass is underlain by permafrost. Seasonal frost commonly overlays, and there is instead a "thaw line" during the summerSummer is one of the four temperate seasons. Astronomically, it begins with the summer solstice (around 21 June in the Northern hemisphere, and 21 December in the Southern hemisphere) and ends with the autumn equinox (around 21 September in the Northern h.