The Arizona Republic

Yes, it’s getting hotter:

The facts are in the stats as Arizonans feel the heat

- RONALD J. HANSEN

This summer’s June, July and August were the fifth hottest months in Phoenix since temperatur­e recordkeep­ing began in 1895. And six of the eight hottest summers in Phoenix have happened since 2000.

If you think Phoenix is hotter now than it used to be, you’re right.

This year, the summer months of June, July and August were the fifth-hottest in the city’s history, dating to 1895, when daily highs and lows were first recorded.

The record heat shouldn’t be a surprise: Six of the eight hottest summers in Phoenix have happened since 2000.

Remember that blistering week in June, from the 19th through the 25th? It was the city’s second-hottest seven-day span ever. That trailed only the week in June 1990 that included the city’s alltime, one-day high of 122.

Here are five other skin-singeing facts that suggest Phoenix weather has changed decisively in less than a lifetime, and not coincident­ally as the city’s population mushroomed.

All the data comes from the National Oceanic and Atmospheri­c Administra­tion.

1. Records fall in same direction

Phoenix establishe­s new all-time records for a handful of the 365 days each year. But overwhelmi­ngly they are record highs.

Since 1980, Phoenix has set three record lows. For example, in 2008, Phoenix reached a record low 64 degrees for Aug. 28.

In the same span, it has set 252 daily record highs. So far, there are nine new records in 2017, such as July 7, when the city hit 118 degrees. That shattered the old mark of 115 degrees for that day set in 1905.

In fact, more than half the daily record lows for Phoenix were set before 1930 and only three came after 1980.

By comparison, more than half the daily record highs have come since 1989. Only 14 daily record highs were set 100 or more years ago.

2. Extra month of triple digits

Triple-digit days are to be expected in the desert. What’s new is the number of them each year.

Between 1900 and 1969, Phoenix averaged 84 100-degree days annually. Since 2000, the city has averaged 113 of them each year. It’s like Phoenix added

an extra month of summer.

And it’s no fluke: Between 1970 and 1999, the city averaged 105 such days.

Before 1933, Phoenix had only one year with 100 or more 100-degree days, dating to 1895. Now, the city has hit that mark 30 of the past 35 years, including this year.

3. Summer nights aren’t as cool

 ?? COURTNEY PEDROZA/THE REPUBLIC ?? Umbrellas provide some relief from the blazing sun for spectators at the state high-school track championsh­ips in Mesa this past spring.
COURTNEY PEDROZA/THE REPUBLIC Umbrellas provide some relief from the blazing sun for spectators at the state high-school track championsh­ips in Mesa this past spring.

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