半暖半夏半微凉日光微暖夏亦凉
[bàn nuăn bàn xià bàn wēi liáng rì guāng wēi nuăn xià yì liáng]
This describes a kind of mixed climate, especially suitable for expressing the mood under such weather. It means a warm and sunny yet cool summer day - 'The sunlight feels mildly warm, and the summer can also be somewhat cool.'