Wiktionary
degree days
n. (plural of degree day English)
Usage examples of "degree days".
One of the more interesting sights you'll see out here are the scores of little old ladies huddled up in sweaters on 90-degree days.
In the suffocating heat of one-hundred-degree days and ninety-degree nights, the bags had swollen and exploded.
One of those eighty-degree days was a Saturday, and I had a baby-sitting job with the Barretts.
No more ice storms, no 108-degree days, no tornadoes, and no hurricanes.