月の(つきの)明るい(あかるい)夜(よる)や、暗闇で(くらやみで)蛍が(ほたるが)飛び交う(とびかう)様子(ようす)、雨の(あめの)降る(ふる)夜(よる)

Sei Shonagon continued: 'In summer, the night is lovely. A moonlit night is of course splendid, but even on a dark, moonless night, the sight of many fireflies flitting about, and even a rainy night, are all very elegant and interesting,' expressing the various beauties of summer nights.