Summer nights are getting hotter. And those really cold summer days? They're disappearing. 

Climate change captures attention when it manifests in major storms or droughts. But, it also has been changing the way we experience the everyday. 

The Eagle analyzed data from the 1960s and the first two years of the 2020s from the Pittsfield municipal airport to see how the temperature is shifting.

1. Remember those hot summer nights?

Minimum temperatures from June through August — that's just the coldest any given summer night will get — have been rising in cities across the country. 

Climate scientists say it's a combination of human-caused climate change and urbanization driving these higher temperatures.  

Inspired by The New York Times' analysis of summer nights nationwide, The Eagle looked at the same data for the Pittsfield municipal airport. 

In the 1960s, the average minimum temperature was 53 degrees. In the 2010s, that rose to 56 degrees.

In 2020 and 2021, a much smaller data set, the average has been 58 degrees.

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The data, provided by the National Oceanic and Atmospheric Administration, does not include temperatures for large portions of the 1970s, '80s and '90s. The dataset has been smoothed to show trends, rather than individual data points.

Why does it matter if it's hot at night?

"The night needs to be substantially cooler than the day to really give your body a break," said Madeleine Scammell, associate professor of environmental health at Boston University. "People who are most vulnerable to the effects of hot nights are the people whose bodies are less capable of regulating and adapting. That would be elderly people, as well as infants."

Hot nights decrease sleep quality, she pointed out, and poor sleep can lead to health issues, as well as accidental injuries and significant economic losses.

"I've heard families talk about, 'Well, when it's an exceptionally hot night, we all just camp out in the coolest room,'" Scammell said. "But, when you have increasing frequencies of very hot nights, doing that is not fun anymore. It's not an adventure. And the sleep deprivation catches up with you."

Hot nights also can lead to higher utility bills, as families run their air conditioning units for longer, as well as increased electricity usage, driving a negative feedback loop that speeds up climate change.

2. Days are getting hotter, too

It's not just the nights.

The average maximum temperature recorded at the airport in the 1960s was 77 degrees. By the 2010s, it had jumped to 78 degrees. 

In the 2020s so far, the average summer high has neared 80 degrees. 

Like with most of the effects of climate change, the impacts of hotter days and nights has not been distributed evenly. For example, one study in Boston by Harvard University and the Dana-Farber Cancer Institute found that low-income residents and those who did not speak proficient English had higher rates of mortality on hot days.

Hot days and nights are also a staple of urban areas, Scammell points out. New developments and reductions in tree cover ensure that cities get hotter and stay hot.

"The cooling that was built in is no longer there," she said. "You have a lot more tarmac, rubber roofs, impermeable surfaces that are just absorbing the heat and keeping it there." 

3. But, I want to know about the average temperature

The data from the Pittsfield municipal airport does not include averages — only maximum and minimum temperatures for any given day. But, NOAA also provides countywide data on average temperatures across timespans one month or longer.

The average temperature data for June through August, since the 1960s, also shows a steep increase.

Francesca Paris can be reached at fparis@berkshireeagle.com and 413-447-7311, ext. 239.