A curious find in Batch 8, from this day 149 years ago:
Historical weather forecast records for Oxfordshire for June 1866, from the Met Office website:
yyyy mn tmax tmin af rain sun
degC degC days mm hours
1866 6 21.9 11.1 0 81.7 ---
Thankfully the weather in Oxfordshire today is glorious, for which we’re sure the sheep are truly thankful!
Newman Archive 
This storm is mentioned in one of the Oratory School magazines, and described at greater length, but I don’t have the time to source it.
Best wishes, Paul Shrimpton