Cajú rains
From Glossary of Meteorology
cajú rains
In northeast Brazil, light showers occurring in October.
The rainy season in Brazil normally begins in December and lasts until April or May; then follows a dry season until the rains at the end of the year. In October of most years, however, there will be local showers known as chuvas de cajú (cashew rains), so-called because they occur at the time of blossom of the cashew tree.