Summary of observations in McKinneyNote that the numbers below should be used very carefully. These numbers are not official recordings and are based on previous observations in McKinney. There may be observations in between those listed here that have higher or lower values. | | Lowest | Highest |
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| Value | Time | Value | Time |
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| Temperature | 30 °F | Mar 21 at 3:53 AM | 69 °F | Mar 19 at 2:53 PM | | | | | | Humidity | 38% | Mar 18 at 6:53 PM | 100% | Mar 21 at 1:02 AM | | | | | | Barometer | 29.84 "Hg | Mar 19 at 11:53 PM | 30.32 "Hg | Mar 16 at 9:53 AM | | | | |
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Detailed list for all week