We're finally done with triple digits for the year, but check out where we ended up. Temperatures, not surprisingly, hit the triple digits almost every day from June through September, except for the occasional fast-moving thunderstorm. The numbers are troubling in Maricopa County, home to Phoenix. No significant relief from the heat is in the forecast, and excessive heat watches are already in effect for Labor Day weekend. Phoenix records were checked back to 1896 to find the highest humidity ever for each temperature from 100 through 118 degrees. Since July, an unusually strong and persistent area of high pressure, or heat dome, has sprawled over the West, setting records not only in Phoenix but also in Tucson and many other locations west of the continental divide. This summer, the heat was intensified by a lack of clouds, rain and storm activity because of a weaker-than-usual summer monsoon, which typically runs from July into early fall. Rosendahl, H. 1976: “Table of daily Values of Maximum Possible Solar Energy, in Solar Radiation and Sunshine Data for the Southwestern U.S.”. Our analyses showed that trend was not the source of non-random inter-annual variation in June (or any other month). What to Pack: You won't need a sweater or jacket in the spring, but a long-sleeve T-shirt or sweatshirt can come in handy if a rainy day is slightly cooler. Is Phoenix becoming more humid? Phoenix Sky Harbor International Airport Guide. Also shown is the ten-year average daily precipitation at Phoenix (curve G). The dryness sets up a self-reinforcing feedback cycle in which a drier land surface makes it possible for air temperatures to heat up faster, with less solar radiation going toward evaporating water. So how well did the climate models perform? Protected by Akismet | Middle States Commission on Higher Education. This marks 100 years of continuous weather records for Phoenix. Local Climatological Data, Monthly for Phoenix, Arizona. Watch Emmy Award-winning meteorologist April Warnecke weekday mornings on Good Morning Arizona. There was a problem saving your notification. The previous record for the most days of 115 degrees or higher was seven days. We're seeing more and more overnight lows in Phoenix in the 90s now during our summer months. During July and August, there is an increase in humidity, and there is often considerable afternoon and evening cloudiness associated with cumulus clouds building up over the nearby mountains. September: 100 degrees Fahrenheit (38 degrees Celsius)/75 degrees Fahrenheit (24 degrees Celsius), October: 89 degrees Fahrenheit (32 degrees Celsius)/64 degrees Fahrenheit (18 degrees Celsius), November: 76 degrees Fahrenheit (25 degrees Celsius)/52 degrees Fahrenheit (11 degrees Celsius). March: 78 degrees Fahrenheit (26 degrees Celsius)/54 degrees Fahrenheit (12 degrees Celsius), April: 86 degrees Fahrenheit (30 degrees Celsius)/60 degrees Fahrenheit (16 degrees Celsius), May: 95 degrees Fahrenheit (35 degrees Celsius)/69 degrees Fahrenheit (21 degrees Celsius). The winters are mild. The next closest stretch was in 2011 when temperatures were that high for 33 days. June: 104 degrees Fahrenheit (40 degrees Celsius)/77 degrees Fahrenheit (25 degrees Celsius), July: 106 degrees Fahrenheit (41 degrees Celsius)/83 degrees Fahrenheit (28 degrees Celsius), August: 104 degrees Fahrenheit (40 degrees Celsius)/82 degrees Fahrenheit (28 degrees Celsius). The continued depression of the averaged receipts of solar energy into August is due to the increased water vapor in the atmosphere (curve F, from Reitan, 1960). During the spring months southwest and west winds predominate and are associated with the passage of low-pressure troughs. The scorching heat in Phoenix and other parts of the desert Southwest comes as several other parts of the Lower 48 also registered their hottest summers. But the heat didn't end when summer officially came to a close at the end of August. But before you make your reservation, make sure you understand Phoenix weather.

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