So many frosts in March, so many in May.

The saying expresses a traditional weather belief that a frosty March will be balanced by an equally frosty May. It presents the seasons as following a compensating pattern rather than treating each cold spell as isolated.

It may be said after late-winter or early-spring frost to anticipate further cold later in spring. The proverb conveys a traditional rule of thumb, not a reliable scientific or precise meteorological forecast.

Use it in conversation about seasonal weather, especially when March frost prompts concern about a later cold spell in May. Its tone suits a proverbial observation or a lightly cautionary remark about gardening and spring conditions.