July 2018

The old adage of a change in month bringing a change in the weather did not happen. An anticyclone centred over or near the British Isles bringing hot air from continental Europe ensured that it continued dry and very warm or hot for most of July.

Until 19th temperatures ranged from 24.7°C to 30.6°C and night minima between 12.9°C and 17.1°C. It also reached 30.2°C on 8th.

Up to 20th there was no significant rain (less than 1mm in a day) which, with the 30 days of June added up to a dry period of 49 days.

On the night of 20th/21st a band of rain forced its way eastwards and brought half an inch, 12.7mm of rain to break the 'drought'. However, the increasingly hot, dry weather then continued, reaching a maximum temperature for the month of 31.9°C on 26th.

The weather broke that evening, with thundery showers which continued until 30th. The only notable fall was 8.5mm on 28th contributing to a total of 14mm over five days. The month's total of 27.5mm is 55.2% of my 25 year average. The year's total stands at 330.4mm, 90.5% of average.

The daytime maximum fell to 21.4°C on 28th and 29th, the lowest for the month but then started to slowly rise again as did the barometer. Night minima did not vary much, ranging from 12.9°C to 18.8°C throughout.

July continued the hot, dry summer with four days exceeding 30°C and 18 days exceeding 80°F. The overall average was 3.4°C above my 30 year average. In comparison, the last hot July in 2006 was 3.3°C above my 25 year average at the time.

Mike Wilkins

25 year Rainfall averages are from 1992-2016
30 year Temperature averages are from 1981-2010