Texas summers can be brutal. High temperatures can reach the 100s for days, and humidity can make the heat index feel even worse.

But summers aren’t terrible in all Texas cities. Some areas of the Lone Star State have cooler summers than others — albeit not by much.

Debbie, who declined to give her last name, said she's lived in Texas for 40 years. She's experienced her fair share of hot Texas summers across the state, including in Greenville, Mesquite, Garland and Houston. She later moved to California, but after 24 years in San Diego, Debbie is looking to retire and return to Texas.

That's why Debbie wanted to know what part of Texas has the coolest summers, so she asked The Dallas Morning News.

Her question is part of Curious Texas, an ongoing project from The News that invites you to join in our reporting process. The idea is simple: You have questions, and our journalists are trained to track down answers.

You can send us your Curious Texas questions by texting "DMN" to 214-817-3868. Follow the prompts and introduce yourself to us, share your story or questions, and we'll text you with information as we report the story.

There are two things to know about our method in searching for an answer. First: Meteorologists define summer as the months of June through August. Second: The National Weather Service has 12 forecast offices that oversee Texas cities. Those offices create forecasts for their respective regions, and also update and maintain records.

To search for an answer to the question, we looked at data from those 12 offices and compared the latest 30-year average temperatures during June, July and August across the Lone Star State.

So who has the coolest summers?

The answer is in the Panhandle, particularly around and north of Amarillo.

Amarillo has an average summer temperature of 76.5 degrees, according to the National Weather Service. Average lows from June to August in Amarillo range from 61 to 65.2 degrees, and average summer highs range from 87.7 to 91.4 degrees.

Stratford, about 80 miles north of Amarillo, even sees average low temperatures dip down to a cool 57.5 degrees during June.

Of course, figuring out where the coolest summers are in Texas begets the question:

What area of Texas has the warmest summers?

Answers get warmer the farther south you go.

In Brownsville, the average summer temperature is 84.7 degrees. High temperatures in the border city range from 92.1 in June, up to 94.4 degrees in August. It’s important to note that these are just averages, and temperatures can range much higher — Brownsville saw several days in the 100s last July.

How does Dallas-Fort Worth compare when it comes to average temperatures in the summer? The area is on the warmer side with a summer average of 84.1 degrees. Average summer lows in Dallas-Fort Worth range from the low- to- mid-70s, and average summer highs range from 91.3 to 96.1 degrees.

While the Panhandle has relatively cooler summers than the rest of the state, no Texas city compares to San Diego, where the average summer temperature is a cool 69.3 degrees.

Tell us:

What do you wonder about the weather in Texas? No temperature is too hot or too cold.