Air is so dry it cools off quickly and heats up quickly during the day.
Our gently rolling terrain combined with rapid transition between the outer suburbs and very sparsley populated areas can result in wide temperature variances on calm, clear nights. There was a night back in October 2021 when my car thermometer showed 72 degrees at NW 10th & Garth Brooks, and dropped to 51 degrees at NW 10th & Cimarron, just three miles to the west. The OKC East Mesonet site will sometimes be 10 degrees cooler than areas just a mile or two to the west if conditions are right, due to its location in the river valley and lack of urban heat island influence relative to Downtown/Midtown OKC.
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