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Originally Posted by Resident 2B
The only way 38F water can freeze is for the air around it to be below freezing.
With the wind down and the dew point low, radiational cooling has a huge impact and right at the ground or lake level, it can be colder than at say 10' or 20' above the ground or lake. The cold air seeps to the lowest possible level.
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The part about needing below freezing temps seemed obvious to me which is why I was puzzled. I have a local temperature gauge that tracks high and low temps. The lowest reading it recorded last night was 38.
But, you explained it. The gauge is located about 100' from the shoreline, and about 20-30' above water level. The air was very still last night I'm sure the cold settled above the water.
Thanks!
Also, contining on my report, I forgot to mention that while the water is usually crystal clear this time of year, it is now very tea-colored and muddy from all the runoff.