Summer nights around the Rockford area have been pretty noisy lately, thanks to the efforts of our local cricket and cicada populations. Why are they louder now than they were at the beginning of summer?

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The Changing Of The Guard

Here in Northern Illinois right now, we can hear the cicadas doing their screeching, I mean singing, in the treetops throughout the day up until around dusk. Then, having finished their set, the cicadas make way for the crickets to commence their chirping from ground level. The crickets then wrap up their concert around dawn, and the cycle starts all over again.

Closeup of cricket in the hiding place
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My wife and I were out in our neighborhood the other night at about 10pm for a walk with the dog when I noticed that the cricket-song was literally drowning out pretty much every other sound around us. Including each other.

Me: The crickets sure are loud.

Amy: Why would Tom Ricketts buy a cloud? That's just stupid.

Me: No, I said the crickets sure are loud.

Amy: The chiclets are sour?

Me: Yep.

crickets in industrial farm
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It's All About The Temperature

According to a piece at the Lake County Journal, air temperatures have a lot to do with not only the cicada-cricket overlap that takes place around dusk, but also the amount of chirping that crickets will do. The warmer we get at night, the more chirping:

It’s been said that you can tell the temperature by counting the number of times a cricket chirps within a given amount of time. It’s true – even agrees that if you count the number of chirps a cricket makes in 14 seconds, then add 40, you’ll get the approximate temperature. The reason crickets and cicada songs only overlap this time of year is because cicadas aren’t nearly as vocal if the temperature isn’t around 80 degrees. As the temperatures decline in fall, we can still hear crickets, but the cicadas die out.

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