Temperature is one of the most variable of the measured weather parameters. On our property, the temperature can vary by >10F over a distance of 300' and elevation change of 100'.
Wow!
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It's not surprising that you are seeing those variances over those distances.
Well, the one thing that's fairly constant is that my daytime readings are higher than the neighboring NOAA stations' readings in the summer. Incidentally, looking at Weather Underground, I've noticed that most nearby personal weather stations give higher daytime readings (often much higher) than those of the surrounding NOAA stations. So apparently a lot of folks experience this.