Indian Summer is an unseasonably warm period after fall cooling has set in. Blackberry Winter is similarly a cold snap after spring warming has arrived. And Strawberry Spring is the name for warm days in what should be a period of winter cold. I don’t think Indian Spring is used anywhere, except as a place name. The references to Blackberry and Strawberry, by the way, vary in different regions of the USA or parts of the world depending on what is in bloom in those respective locations during the season in question. In England, for example, Blackthorn Winter is their approximation of Blackberry Winter.