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Yes, it is definitely doable. -20°C is only -4°F. The real question is whether it is doable by you at the level of discomfort and hassle you are willing to put up with. Only you can answer that....
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#1: Attribution notice removed
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System
·
2020-06-03T15:54:14Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/3381 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/