Summer nights getting warming each year

AUSTIN (KXAN) -- Much of the focus during the summer months is on extreme heat during the daytime. However, our warming climate is also increasing nighttime temperatures.
KXAN's climate partners at Climate Central released a study that found that since 1970, summer nights have warmed by an average of about 3 degrees.Their analysis took numbers from 247 United States cities. Nearly all of them saw an increase in nighttime temperatures.
On average, these cities currently experience about 27 warmer