A new analysis has Poland’s July temperatures hitting 20.6°C in Medieval times, whereas they’re only 17.4°C today.
The temperature record for this region also shows today’s temperatures are not much different than they were during the Little Ice Age.
Another chart contained in the study (Pleskot et al., 2022) shows North America’s and Europe’s mean annual temperatures are nearly the lowest of the last 4,500 years.
Image Source: Pleskot et al., 2022
And any warming in Poland in recent decades can easily be explained by the documented increase in absorbed solar radiation, or global brightening (Bartoszek et al., 2021).