Jeffers Foundation

PHENOLOGY

Phenology

Fourth Week of July

Listen for snowy tree crickets to begin singing soon after sunset. They're called the temperature cricket because they chirp faster as the air temperature warms. If you count the number of chirps in 15 seconds and add 40, you get a good approximation of the air temperature in degrees Fahrenheit. To produce their music, the males raise their wings straight above their backs, rubbing them together. The vibration creates a chirp with a persistent "chee-chee-chee," also described as "treat-treat-treat," a sleigh-bell like sound.

July 22, 2016 - With air temperature highs in the mid-90s the previous three days, most lake water temperatures were in the low 80s. Snowy tree crickets had begun chirping; observers heard them for the first time of the year in Waconia, Golden Valley, and Northfield.

July 23, 2016 - Six miles out of Canal Park in Duluth, Lake Superior water temperature was a warm 67 degrees, but 70 feet down it was 43 degrees. Fish biting included lake trout and coho salmon.

LOOK FOR

What to Look For 07, 2018

First field corn silking (Carver County):
2016 July 7
2015 July 10
2014 July 16
2013 July 20
2012 July 2

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