Experts: Inland area's below-average temperatures not lasting - Southern California News

Most of Riverside and San Bernardino counties were 1 to 2 degrees cooler than normal in June, and highs in the local mountains were as much as 3 degrees below average. For April, May and June, temperatures across California were 2.5 degrees lower than average, he said.
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Temperatures have increased 1.4 degrees Fahrenheit in the past century -- most of it since 1970, said Schmidt, the NASA climatologist. That jump is not terribly problematic by itself, but continued releases of carbon dioxide will accelerate warming in the next 50 to 100 years by 4 to 9 degrees, he said.

"Translated to land temperatures, that's very, very large," Schmidt said.
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Since the 1980s, each decade has grown warmer by about .36 degrees per year [36 degrees per century!?], the NASA analysis found.
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In Southern California, much of the warming is due to the heat island effect from fast-paced development, especially inland, [Bill Patzert, a climatologist with NASA's Jet Propulsion Laboratory in Pasadena] said. When buildings, roads and other infrastructure replace agriculture and open areas, the surfaces hold in heat -- making it as much as 22 degrees hotter at night in big cities, according to the Environmental Protection Agency.

Urban development has increased Inland temperatures by 5 to 6 degrees, Patzert said.
... [Patzert] "The march of global warming is not only steady, it's actually accelerating."