Fig. 3: Temperature metrics from the ERA5 data 1984-2014.

a–e Minimum daily temperature, f–j days below 5 °C, k–o maximum daily temperature and p–t days above 35 oC. a, f, k, p show the parameter mean for the period 1st to 14th January over the 30-year interval, where black indicates cooler temperatures and yellow indicates warmer temperatures, b, g, l, q show the difference between the medium (15th December to 31st January) and short (1st to 14th January) period, with c, h, m, r showing the significance of this difference (Willcoxon signed rank test, n = 30), d, i, n, s the difference and e, j, o, t the significance of the difference between the long (1st December to 15th February) and short (1st to 14th January) period. In b, d, g, i, l, n, q, s red indicates that the long or medium period is warmer than the short period. In c, e, h, j, m, o, r, t dark blue indicates a low p-value and yellow indicates a p-value > 0.01.