It was bone chilling cold between 1645 through until 1715 and it was called the Maunder Minimum. SC 24, our present solar cycle, is the weakest since SCs 5, 6 and 7, a time known as the Dalton Minimum (1790-1830). NASA tells us that during these time periods temperatures across much of the Northern Hemisphere plunged when the Sun entered quiet phases.
During these periods, very few sunspots appeared on the surface of the Sun, and the overall brightness of the Sun decreased slightly, which is exactly what is happening today. Weak solar activity, the weakest in two-hundred years, has already been shown in climate history to have a cooling impact on global temperatures in the troposphere which is the bottom-most layer of Earth’s atmosphere – and where we all live.