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I concur with Ray. I have found over the years that sky temp changes not only daily in clear conditions but also seasonally. For instance during summer the sky temp at my location is generally around -6 during hot weather and then about -10 during days of 25 degrees. Whereas during the peak of winter the sky temp can measure as high as -25. Each of those instances are when the sky is perfectly clear.
Also something to consider is the equipment being used to measure the sky. There are a few brands out there and each would no doubt differ a little in measuring the temperature.
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