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. 2021 Jun 23;12:689121. doi: 10.3389/fpls.2021.689121

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Copyright © 2021 Fraga and Santos.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Safe Winter Chill index over mainland Portugal for the baseline period (1989–2005) and for three future periods (2021–2040, 2041–2060, and 2061–2080) and two future scenarios (RCP4.5 and RCP8.5). (B) Same as panel (A) but for the Safe Heat Forcing index, values are shown in ×10³.