According to my data so far, June's mean is currently 0.8 degC higher
than that of 2003, which was exceptional in itself here in Durham. Only
5 Junes have had a mean above 15.0 degC in Durham, these being 1896
(15.4), 1940 (15.8), 1950 (15.2), 1976 (15.4) and 2003 (15.9).

How is it in other parts of the country?

Dave in Ferryhill, Co. Durham