Indian summer

Then a severe frost succeeds which prepares it to receive the voluminous coat of snow which is soon to follow; though it is often preceded by a short interval of smoke and mildness, called the Indian Summer.

Thus, while at times before our eye / The clouds about the present part, / And, smiling through them, round us lie / Soft hues of Memory's evening sky – / The Indian summer of the heart, / In secret sympathies of mind, / In founts of feeling which retain / Their pure fresh flow, we yet may find / Our early dreams not wholly vain!