For hot and cold years try 1967 and 1976, for deluges and flooding try the 30s or 50s.
Try the chinese altering the speed of the Earth slghtly by their massive Yang tse water resevoirs, try magnetic changes, the poles moving the auroras, volcanoes, meteorites.
Of course there's climate change and risen and rising seas and deserts and water and lakes appearing and disappearing. There's also moving tectonic plates, whole continents tipping and moving, solar storms etc.
Humans are very small beer compared to that lot, have not been here long and will not be here much longer so their input is negligble in historical terms.