Ah whackey weather is something we should toss into the mix in our playing T2K. But more random. A hot spell where temps are extreme for a bit. Going from a monsoonal type rain say in POLAND, then dropping back to the normal weather pattern.
Toss some snow into the Tropics to really turn things around. Imagine what would happen if it started snowing in Honolulu or Panama City?
Turn the Western Desert into Oz and the Mojave centers of major rain fall.
Messed up weather patterns like that would be a good reason for a major wordwide famine, the food production regions become flooded or deserts in a year or two think of the infrastructure that would have to shift in very short order to compensate for such a change? <And that is a reason why even the earilest of argicultural societies had astronomy to deal with the seasons which determined the weather conditions>