After the hottest day of the year when the thermometer peaked at 28.8c and then today with a slightly lower 28.3C a burst of torrent rain, over a few minutes just after 1600 hours, produced 3mm of very heavy rainfall. During the following hour the temperature dropped by 8C and a strong gust of wind, the highest this month of 28mph was recorded at 1611 hours, at the height of the squall.
Having enjoyed two weeks exploring Iceland, being the wettest July in 120 years, it was good to return to much sunshine and heat. The month so far has given us only one day when the maximum temperature did not reach or exceed 20C, 18.9C on the 8th. The last week has brought consistent maxima of 26C and 27C with the hottest day so far touching 27.8C on the 23rd.
There have been significant falls of rain with the highest of 17.7mm on the 7th, interspersed with hot, dry days. The total rainfall to date is 44mm but the evapotranspiration total is now almost double that with 83mm.
Today was the hottest day since 4th September 2013 when the thermometer soared to 26.0C. The morning started much warmer than previous nights with the thermometer reading 10.1C at 0800 and at the same time the soil temperature, at a depth of 5cm, was almost the highest this year reading 17.8C. Direct sunshine totalled 11.6 hours, the second highest for 2014.
Although cloud built up around lunchtime on the 2nd the thermometer reached 24C, there were 13 hours of global sunshine (over 6 hours of direct sunshine at 100w/m2) and a high UV index of 7.4.
The weather in June proved to be what we hope for and expect from a summer month. The mean temperature of 15.8C was 1.1C above the 30-year average. This was not as warm as in June 2006, which had a mean of 16.6C, but decidedly better than June in 1991 which had a mean of just 12.4C and much rain (122mm). It was the warmest June since 2007 and the sixth warmest I have recorded.
The total rainfall was 37.5mm, which is 66 per cent of the 30-year average and 19mm below the mean. For comparison, the wettest June was in 1998, which produced 143mm and the driest was in 1995 that brought only 13mm. There were 21 dry days and the wettest day on the 13th gave a total precipitation of 11.3mm. Due to the very wet months at the beginning of the year the precipitation for the first six months of 2014 is the highest I have recorded being a total of 638mm, this beats the previous record of 551mm set in 2007.
Due to the limited rainfall and many warm, dry days, the evapotranspiration totalled 102mm. This is the equivalent water vapour that escapes into the atmosphere from plant material, the ground and water surfaces. This produced a deficit of 65mm of equivalent rainfall.
The solar energy for June was the highest since June 2010.
Although we had much global sunshine, the maximum ultra violet radiation reached an index of 9.0 (on a scale of 0 – 10), less than 2011 (10.4) and 2013 (10.1). However, the average for June was the highest for three years just beating the 2011 average. The direct sunshine total for June was 141.7 hours. This result was from a newly installed instrument so no comparison can be made with previous years.