Point taken, but ice core samples have a resolution down to the exact year, which (coupled with historical accounts) slow massive, sudden drops in temperature during previous solar minimums.
Some researchers claim that the current solar minimu began in 2013. The noticeable effects are slight in the beginning, but there comes a tipping point of sorts when the bottom falls out, and the cooling impacts to all life forms become dramatic, and (seemingly) sudden. Such impacts are now being forecast to arrive within the next 24 months.
Prepare yourselves.
The sun’s overall level of magnetic activity has been observed to be trending downward for several decades now.