The following text is from Edith Wharton’s 1917 novel Summer. Eagle County is located in a region where summer weather can be quite cool.
There had never been such a June in Eagle County. Usually it was a month of moods, with abrupt alternations of belated frost and mid-summer heat; this year, day followed day in a sequence of temperate beauty. Every morning a breeze blew steadily from the hills. Toward noon it built up great canopies of white cloud that threw a cool shadow over fields and woods; then before sunset the clouds dissolved again, and the western light rained its unobstructed brightness on the valley.
There had never been such a June in Eagle County. Usually it was a month of moods, with abrupt alternations of belated frost and mid-summer heat; this year, day followed day in a sequence of temperate beauty. Every morning a breeze blew steadily from the hills. Toward noon it built up great canopies of white cloud that threw a cool shadow over fields and woods; then before sunset the clouds dissolved again, and the western light rained its unobstructed brightness on the valley.