The settled weather at the end of May continued into June and the maximum temperature for May, (23.1°C on 31st) was exceeded on 1st of June, at 25.5°C. This was further exceeded the next day reaching 27.2℃ but then dropped to the low twenties. However, it gradually crept up again reaching a peak for the month of 27.7°C on 14th. It also reached 24.8°C on 15th and 26.8° on 16th.
The skies were a mixture of cloud and sunny spells accompanied by light, variable wind. Apart from a brief shower on 2nd there was no rain over the 22 days between 24th May and the night of 16th/17th June.
The next few days and nights brought heavy rain with 22.1mm on 17th/18th and 24.1mm on 18th/19th. A further 6.6mm fell on 19th and 7.0mm on 21st. Maximum temperatures dropped as low as 14.7°C on 21st but otherwise remained around 20°C for the rest of the month.
Night minimum temperatures stayed remarkably steady throughout the month, around the mid-teens but briefly fell below 10℃, to 9.4°C on 5th and 7.5℃ on 23rd.
Sunny periods returned on 22nd and remained until the end of the month apart from a short, sharp frontal system going through on the night of 26th/27th dropping another 21mm of rain to bring the total for June to 85.3mm. This made it the wettest June since 2012 and 79% above average. The total for the year to date is 387.9mm, 23% above average.
Broadly, June weather could be divided into three periods, the first being more typical “Flaming June” in temperature, though with less than full sun, a wet period beginning the second half followed by ten days of more unsettled conditions. A warm (1.7°C above average), wet month. The wind was light, variable throughout.
25 year Rainfall averages are from 1992-2016
30 year Temperature averages are from 1981-2010
30 year temperature averages for Steventon are from 1981-2010
Oxford rainfall averages are from 1992-2016
Summary data from Mike Wilkins, January 2021