Tucson's late-season heat wave hasn't let upΒ βˆ’Β and it doesn't look to be breaking anytime soon.

The Old Pueblo broke yet another record high on Sunday, when the high temperature reached 105 degrees. The previous record high for the day was 101, set in 1934.

ThatΒ was the 11th record-breaking high temperature here in a twelve-day span, the National Weather Service in Tucson said.

Sunday's record-breaking high also marked the 105th day this year Tucson reached triple-digits, edging closer to the record: 108 days, set in 2020.

The weather service says the "annual normal" for days in the year of at least 100 degrees from 1991 to 2020: 68 days.

Such a streak occurred from April 18 through April 29 in 1910, when all but one of those 12 days broke a temperature record.

Similarly, 11 days in the span of Aug. 8 to Aug. 24 in 1915 β€” a total of 17 days β€” saw daily record-breaking high temperatures.Β And Dec. 5 to Dec. 18 in 1939 had 11 of 14 days break record highs, the weather service said.

Crystal Vaughn, left, takes a drink of water Monday afternoon as she and Henry Peralta find a shady spot at Catalina Park, on North Fourth Avenue just south of East Speedway. By Monday, Tucson had recorded 11 days of record-breaking high temperatures in a 12-day span. Tucson is getting closer to breaking to the city’s record of triple-digit high temperatures within a year, 108 days that was set in 2020. On Sunday, Tucson had recorded 105 days of at least 100 degrees this year, the weather service said.

Monday was expected to 104 at the Tucson International Airport, where the city's official weather records are measured, said Alex Edwards, a meteorologist with the local weather service office.

The hottest Oct. 7 previously on record: 101, set in 2020.

A persistent high-pressure ridge over the West is fueling the late-season heat wave,Β EdwardsΒ says.

"So, the whole region is experiencing-above normal temperatures. And I say western, but actually the central U.S. is experiencing the same thing ... it's just persistent high pressure, persistent dryness," he said. "It's a pattern that's not going away, really, and oftentimes these patterns can become figurately stuck. Essentially, we're already in a time of year where we haven't reached the winter time (when) low pressure system patterns come in."

The current outlook for the rest of October, he said Monday, is likely above-normal heat.

"So, there's no real break in it for the foreseeable future," Edwards said. "Just persistent high pressure, really."

Signs are looking like above-normal temperatures for the winter as well.

Tucson will need a weather pattern that pushes cool air from the north into the southwest for this high-pressure ridge to break, Edwards said.

And while Tucson can expect its average temperature to drop over the next month or so, Edwards said, low-90s by the end of the month would still be a whole 10 degrees above normal.

"Our normal temperature for the end of the month, actually, drops into the low-80s," he said. "So well-above normal might mean, at the end of the month, 90 degrees or 92."

Meanwhile, triple-digit heat is expected in Tucson for the rest of the week. And if the forecast is correct, 2024 will tie 2020 for the most triple-digit highs in a given year by Thursday and can set a new record on Friday.Β 

Tucson is expected to reach 101 degrees on Tuesday, 100 on Wednesday and Thursday, and 101 on Friday, the weather service predicts in its five-day outlook.

And Saturday is likely to be in the low 100s too.


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