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In recent years, 23.4c/74F on August 24, 2003. That day had a high of only 32.1c/90F, so it was probably very humid. (Relative to the days that month which had highs of 37/38c(100F) and lows of 16/17c(62/63F)
Month of August 2003 was exceptional, with average high of 32.1c/90F (the warmest month ever), 5.9c above average, and with 5 days that didn't fall below 20c (also the record).
I've never been able to find these data for my city. One time it made the newspaper that there was a record high min. temp for the day of 20C (68F). A couple days later, there was a letter in the paper that said something like: "While one shouldn't assume that one abnormally high min. temperature means the climate is warming, this is clearly evidence of global warming." Actually these sorts of high mins. generally are isolated occurrences around here that tend to happen in advance of a cold front in the summer. The wind is warmed by compression from the high mountains and the temperature can stay up around 80F into the very early AM. Then the before midnight on the next day the temperature has dropped to the mid. 60s and so that becomes the low for the day. It doesn't happen often here but certainly predates the "age of climate change".
During the July 1995 heatwave, MDW recorded two nights in a row with a minimum of above 80F/27C (27.2C, and 28.9C).
Last edited by chicagogeorge; 12-07-2014 at 07:40 AM..
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