In Belgium
average year december 1,0C: 18,93%
top 20 spotless years, december 1,0C: 40%
average year january 0,5C: 21,30%
top 20 spotless years, january 0,5C: 55%
average year february 1,0C: 21,89%
top 20 spotless years, february 1,0C: 30%
But... We must not forget that overall solar activity was lower during the 2nd half of the 19th century than during most of the 20th century, and that the Earth did warm substantially, so that the percentages of both an average year and of a top 20 spotless year might be much, much lower, and that the difference between a top 20 spotless year chance of low CET and an average year chance of low CET might be smaller than some might guess.
The effect of contemporary climate change is much higher than the effect of a top 20 spotless year on our climate, and more parameters come into place when you want to have an ideal winter setting... An QBOe seem to greatly improve winter chances, when combined with low solar activity.