Goodbye 90s! Until Next Year? - 09/10/13
The heat in West Michigan earlier this week (Monday - Wednesday) was quite uncommon for this time of year -- even historic in a few instances. Consider: the minimum temp of 77 degrees in Grand Rapids Tuesday was the highest minimum reading ever recorded in the month of September; Tuesday's high temp in Kalamazoo (94 degrees) tied with the high temp on July 19th as the hottest of summer; the max temps in Kalamazoo Tuesday and Wednesday were as high or higher than those recorded in Miami, Orlando, and Fort Myers.
A cold front that moved across West Michigan early Thursday took the heat and humidity away. And if history serves as a good indicator of what might happen in the future, we won't see such heat again for at least eight months or so. Though 90 degree days aren't unusual in September around these parts, they don't happen more often than they do. Looking back at the last 25 years, we've seen 90 degrees in September 11 times. During that span, we've never had more than three 90 degree days in September, and that's only happened in three years (2011, 2005, 1996).
Here's another important point to note: the latest day on the calendar we've had a 90 degree day over the last 25 years was September 26 (1998); but that was quite an anomaly. Throw that day out and the latest 90 degree day for the last 25 years was on the 13th of the month (2005). Considering that forecast models show max temps for the next week (which takes us through the 18th of the month) to be at or below average, you see how it looks like a good bet to say that we're done with the 90s.