The loss of sunlight also affected rainfall, as typical large-scale atmospheric circulation patterns would have broken down.

Secondly, atmospheric circulation works in a way to limit the effects of high latitude eruptions.

However, the low had characteristics of a subtropical cyclone, with a closed atmospheric circulation and extensive convection extending to the northeast of the system.

The reasons for this latitude and seasonal dependence are complicated, involving atmospheric circulation patterns as well as solar intensity.

Atmospheric circulation, topological features and temperature differences determine the average precipitation that falls in each region.