A season of rain is as trying as a season of drought. Excess rain creates gooey soil, which is no fun for planting if you are a human and no fun for growing if you are a plant.
Roots need air, and day after day of rain can fill all the soil pores with water. The result: Roots have trouble absorbing nutrients and even water.
Incessant summer rains rarely present a problem in soils that are well-cared for or sandy. In clay soils, waterlogging can be avoided if they are treated right. Adding heaps of organic materials such as compost, leaves and straw to clay soils causes the small clay particles to aggregate into larger units. Not walking on or working a clay soil also allows aggregation over time. Larger aggregates have larger spaces between them, so well-aggregated clay soils drain water well, just as water drains well from the large pores within sandy soils.
If conditions are really watery, construct raised beds for vegetables and flowers, and large mounds on which to plant trees and shrubs. Of course, soil used to build up the raised beds or mounds should drain well.