The average temperature for June through September was 73.9 degrees — the highest for those four months in the city going back more than 100 years of record keeping. July was the hottest month, with an average temperature of 81.3, according to the National Weather Service.

It was the fifth-driest summer on record. And there’s no sign of rain in the foreseeable future. “There’s nothing out there,” said one meteorologist, looking ahead to Oct. 11. From June 1 to Sept. 30, just .31 inches of rain fell at the Boise Airport; none was measured in August.

But ... get out the flannel PJs. Tuesday night’s cold front is going to knock temperatures to the mid-30s and low 40s Wednesday morning; the high will be in the low 60s. Thursday will be even cooler — possibly below freezing.

Feel like you lost half the summer to poor air quality? You did. The Treasure Valley coughed and wheezed through moderate or worse air quality on 55 days during the four-month period ending Sept. 30, according to preliminary data from the Department of Environmental Quality. August and September were the worst, with 23 and 14 days, respectively. The two smokiest days were Aug. 12 and Sept. 22, when the air quality index hit 157, the red zone (unhealthy for all groups). As bad as that was, it was much worse in Idaho communities closer to large wildfires.

Is the smoke gone for good? Forecasters can’t say that — but strong winds from the north starting Tuesday night bode well for the Valley. Smoke from the Wesley Fire in Adams County isn’t expected to reach the Boise area.