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Btw, having a glass of a cold drink (uncovered is best) is a good way to get a sense of the dew point. My glass of iced coffee created a puddle on my desk.
Humid air hits cold glass (near freezing?), condenses water when it cools.
If the temperature of the glass is below the dewpoint, any water vapor that comes in contact will condense. If the glass is in the sun the sun may heat the glass despite the cold water.
The dewpoint at the Duluth International Airport right now is 72F/22C, current temperature 89F/32C, current heat index 96F/36C. This is the highest yet this year. Interestingly, less than ten miles away the temperature is only 66F/19C.
Highest dewpoints in the past few years at KDLH (Duluth International):
dewpint of 19c here much higher than yesterday with dewpoint of 10c.
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