Weather Changes

The weather changed a lot , it went back and forth so people didn't know if it was gonna be hot or rain a lot since they didn't know they didn't know if there crops would grow enough food or if it would just die. I think that if the weather kept switching on and off that they should take a break on crops and wait a few days ora week to see what the weather is mostly like and if its raining a lot then they know to keep little plants but if its been hot then plant some crops. When did this weather changing stop?