As can be seen by the data given, 19 July 2006 was 1.2c warmer than 28 June 2018. There are two possible reasons for this: 19 July 2006 featured higher minimums generally and there were only 21 stations in the calculation compared to 25 stations for 28 June 2018. Still interesting to see the comparison of two very warm or hot days in Ireland.
28th June 2018:
19th July 2006:
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