It is very normal for regions around coastlines to be much cooler than inland during the meteorological Summer season. This is down to the fact that land is warmer than sea in Summer whilst in Winter, this is the opposite thus why you see the coldest temperatures to also occur inland. Even in June 1887, the month that recorded Ireland's all-time highest temperature record of 33.3°C at Kilkenny Castle, this rule of thumb applied. This can be shown by Phoenix Park's (in Co. Dublin) daily maximum temperatures for June 1887 with data received by the European Climate Assessment and Dataset (ECA&D). Its maximum of the month wasn't even reached on the 26th which the record was set on. Its maximum temperature for June 1887 fell on the 17th with 26.2°C compared to it recording 24.3°C on the 26th. The reason why Phoenix Park was warmer on the 17th was down to the fact that the wind direction was more of a southeasterly that day and southeasterlies tend to be more favourable for bringing warmth into eastern regions of Ireland than straight easterlies.
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