May was one of hottest on record in Valley - East Valley Tribune: News

May was one of hottest on record in Valley

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Posted: Monday, June 1, 2009 12:18 pm | Updated: 2:37 am, Sat Oct 8, 2011.

Daytime, nighttime, any time - last month was one of the hottest Mays in the Valley's reported climatological history.

According to the National Weather Service, the average low temperature of 73.8 degrees was the warmest since record keeping began in 1896. The normal for May is more than six degrees cooler, at 67.4. Also, this was only the second May on record, joining 2006, not to have an overnight low cooler than 65 degrees.

On three nights, records were broken for warmest minimum temperatures: May 2 (76 degrees, May 19 (83) and May 20 (84). That last day tied as the fourth-warmest May low ever.

The average temperature of 86.1 degrees was the fourth-warmest, and 5.4 degrees above the norm.

Finally, the month's daytime highs averaged to 98.5 degrees, fifth-hottest in history. Usually, the average high is 93.9.

Last month saw a record-setting run of highs of 100 degrees and hotter over 14 straight days, May 6-19, and a record-tying 19 overall. In 29 of the month's 31 days, the maximum temperature reached at least 90 degrees.

Humid conditions usually not felt until the summer monsoon also brought unseasonable rainfall to the Valley. The precipitation total of 0.25 inches was the 18th-most recorded. A typical May sees 0.14 inches.

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