Sunday marked another heat record for Phoenix.

The mercury topped out at 106 breaking the day's previous 70-year-old record.

But Phoenix and its residents who are continuously searching for ways to keep cool are no stranger to breaking heat records, especially in 2017.

2017 is Phoenix's hottest year on record, ever. With a summer that started off with a high temperature of 119, the year would average a temperature of 77.3.

RELATED: Is the Phoenix heat causing street signs to melt?

Several records were broken that summer, including one from 1905.

READ: Hottest day ever: 122° — and other 'cool' Phoenix-is-really-hot facts

Then came 2018 and more record-setting heat. On Jan. 29, Phoenix hit 83 degrees (IN JANUARY!) breaking the previous record set in 1935.

2018 also saw Phoenix hit the 100-degree mark a little ahead of schedule. According to the National Weather Service, May 2 is the average first 100-degree day, accounting for data since 1981.

Phoenix hit 100 for the first time in 2018 on April 10.

READ: 10 'cool' facts about 100-degree temps in Phoenix

As we've said before, Phoenix is indeed getting hot sooner and staying hot longer. But is the Valley of the Sun also breaking more heat records than it has in the past?

The National Weather Service says yes.

"It really holds for warm records - high max temps but especially high low temperatures," NWS said in a Twitter message.

Chart shows daily max temperature records held by each year. (Photo: NWS)
Chart shows daily max temperature records held by each year. (Photo: NWS)
Chart shows daily minimum temperature records held by each year. (Photo: NWS)
Chart shows daily minimum temperature records held by each year. (Photo: NWS)

NWS says the reasons this has been the "general trend," include "general regional warming trends and the influence of the urban heat island."

We're still a few weeks away from 2018's summer with two days already seeing 106-degree temps.

Stay cool out there, Phoenix.