Windrush Weather

Author: Eric Gilbert

  • Summer continues!

    Tuesday brought us 14.54 hours of sunshine and the UV level continued at Very High lifting the maximum to 27.1C. Thus was 1C dawn on Monday but still almost 5C above average.

    Evaporation from ground sources and plant life over the three days of this month has already reached the rainfall equivalent of 16mm with no rain.

    Overnight was less chilly with a minimum of 12.9C being 1C above average.

    Wednesday dawned with variable cloud and little sunshine although by 08.00 the temperature had risen to 15.7C, the coolest night this month.

    Wednesday update: A rare phenomenon was noted at 14.30 when literally a few spots of rain were seen and felt that lasted three minutes, which immediately evaporated. Also noted was that the very light breeze had veered into the south, not seen from that direction since 16th June.

    Update at 18.50: maximum temperature of 24.0C at 17.42,down 3C on Tuesday. A few spots of rain, but nothing more, detected at 18.50.

    Update at 19.25: first measurable rainfall (light) since 18th June lasting 12 minutes starting at 19.03 totalling 0.6mm.

  • Evaporation exceeded 6mm on Monday

    Monday gave us 15 hours of strong sunshine that boosted the thermometer to a maximum of 28.3C, which was 6C above average, tempered by the very brisk north easterly breeze often gusting to 22mph.

    The evaporation from ground sources and plant life was equivalent to rainfall of 6.71mm.

    A cooler night followed with a minimum of 11.6C, which was average for July, that with the effect of sunshine from dawn, raised the temperature at 08.00 to 17.1C.

    Tuesday update at 17.00: maximum of 27.1C at 16.03,which was down 1.2C on Monday’s high but still 5C above the July average. Sunshine will exceed 14 hours.

  • Heat intensifies on Sunday with high of 29.9C

    Sunday gave us plenty of sunshine in the morning thereafter encroaching cloud from the depression over the near continent meant it was reduced after midday producing a total of 6.5 hours and a maximum of 29.9C.

    The new month started with another dry day and the UV level maintained in the Very High category.

    Overnight was very mild with the thermometer not dropping below 15.4C at 06.00 on Monday morning.

    Monday update at 17.00: maximum of 28.3C at 16.58 moderated by frequent gusts of north eastern winds up 22 mph.

    Summary for June 2018

    Rainfall record for June broken

    The average rainfall for June, since this station started in 1984, was 54.5mm but June 2018 produced only 5.3mm. The previous record for the driest month was set in 1995 with 12.5mm but in contrast June 1998 gave us a deluge with 143.2mm.

    There were 22 totally dry days but that obscures the fact that on four days there was very little rainfall to record from drizzle or from brief, light rain showers. The wettest day brought us just 1.8mm.

    The lack of rainfall is only half the picture for this dry month as evaporation from ground sources and plant life meant the equivalent rainfall of 110.4mm was lost to the atmosphere. That was 16mm above the 10-year average.

    June was also memorable for the strong sunshine that totalled 235 hours. The average over the past four years, when this instrument was installed, was 135 hours. June followed the sunny May that gave us 237 hours of sunshine.

    The sunniest day occurred on the 27th with 16.88 hours of ‘wall to wall’ sunshine that followed 16.72 hours and 16.68 hours on the 26th and 25th respectively. There were no days when the sun did not trigger the sunshine recorder, however, it appeared briefly for only 1 minute on the 17th and 5 minutes on the 4th.

    The many hours of strong sunshine meant that UV reached into the Very High level on 23 days.

    The month started on a warm note with three days of above average temperatures, peaking at 25.1C on the 3rd, which was 5C above the 34-year average. The middle of the month saw temperatures cooling off a little but by the 21st the many hours of sunshine meant that the last 9 days in June were well above average, the 26th being the hottest with a maximum of 28.7C when the 34-year average was 19.96C.

    The mean temperature for the month was 1.7C above the average principally down to many hot days as the daytime mean was +2.5C and the night mean +0.8C.

    There were several chilly nights when the thermometer dropped into single figures, the coolest being 4.5C in the early hours of the 22nd.

    The many hours of strong sunshine, high temperatures and lack of rain has meant that the soil temperature at a depth of 5cm rose to 21.4C at 08.00 on the morning of the 26th.

  • Record dry June with rainfall only 5.3mm

    Saturday:
    Maximum: 27.7C
    UV: Very High at 7.6
    Rainfall: Nil
    Maximum wind: 17mph
    Minimum overnight 11.9C.

    The average rainfall for June was 54.5mm with the previous driest June set in 1995 with 12.5mm against against 5.3mm in 2018. Evaporation from ground sources and plant life for the month saw the equivalent rainfall loss of 99.58mm.

    Sunday arrived with minimal cloud and much sunshine that saw the thermometer rise to 17.3C at 08.00.

    Sunday update at 15.30: maximum temperature of 30C at 15.27.

  • Heat builds again on Friday

    Friday again started with cloud brought in from the North Sea but less dense than on Thursday. The sun soon got to work and eventually gave us 14 hours of strong sunshine that by 17.41 gave a maximum of 26.3C with Very High UV levels again

    With just 5.3mm of rain in June it is going to be a record dry month. The contrasting records are that in 1995 we had 12.5mm and 1998 brought 143.2mm.

    Saturday morning has seen the now familiar cloud brought in on the very brisk north easterly wind that meant another mild night with a minimum of 11.3C but no sunshine by 08.30.

    N.B. Daily Statistics – currently not able to update on Saturday.

    Saturday update: maximum up again with a peak of 27.7C, being 7.7C above average.