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Maidenhead (Berkshire, UK): Recent observations and the latest forecast from the author of these pagesA very poor late August Bank Holiday Monday
With low cloud and light rain and drizzle for much of the day, a northerly wind - and with no sunshine - the temperature in Maidenhead on Bank Holiday Monday could only rise to 15.6C. This is about 5 degC below average for the last day of August.
In local records going back to 1965 (when the August Bank Holiday was moved to the end of August) this was easily the coldest August Bank Holiday Monday on record.
In fact, this last weekend (in 2015) was generally a cloudy one. Over the three-day weekend only four hours of sunshine was recorded - more typical of a long weekend in winter than summer.
Overall. August was slightly cooler than normal, but much wetter and duller than normal. The summer will be remembered as one when any hot weather in Maidenhead tended to be short-lived. There were a few very wet days, but little thunder.
2015 - a slow start to summer 2015 has seen a slow start to summer-like weather.
By the end of April things had looked promising as the temperature in Maidenhead climbed to 25.8C on the 15th. Indeed, April was a warm and sunny month overall (1 degC above average), with more evaporation than usual. The warmth was largely due to the daytime temperatures; little cloud led to some cold nights but also helped to make it the sunniest April since 2010. Rainfall amounted to less than half the monthly average, leading to a dry ground surface for much of the last three weeks.
But May gave us a cool month in Maidenhead - the air temperature climbed no higher that 21.9C in the town. May was duller than April although the mean temperature was only slightly below average, while both sunshine and rainfall totals were close to normal for May. However, the maximum temperature of 21.9C was the lowest such value for May since 1986 - so maybe rightly the impression of 'no hot days in May this year' was a correct one.
The first half of June brought largely dry conditions, with the temperature reaching 24C on the 4th and 5th; then, after a cooler interlude, came 25.1C on the 12th and 24.2C on the 13th - before some dull, drizzly weather on the 13th and during the morning of the 14th.
Older news items can be found here.
Note that the observations below refer to the period 0900-0900GMT while the forecasts are for 0600-1800GMT maximum and 1800-0600GMT minimum temperatures.
In these two charts the red line shows the mean of several forecasts. The thin blue lines show the range of values predicted by the different NCEP (ensemble) forecasts, while the dark blue lines give an idea of the standard deviation. The rainfall total is the six-hour total ending at the time indicated (the dates along the bottom axis are written at 0000GMT).
The increase in spread of the forecast values in the previous two charts gives an ideas as to when the forecasts become to be unreliable.
Maidenhead's daily and monthly weather reports
- 1995 1996 1997 1998 1999 2000
- 2001 2002 2003 2004 2005 2006
- 2007 2008 2009 2010 2011 2012
- 2013 2014 2015 2016
Local climatology (updated January 2009)These two sets of data have been compiled using observations made at my home weather station since June 1988. This is a suburban site and is slightly warmer than Hurley because of this. Also, the observations were made at a generally later date than those of Hurley, and the extra warmth is also an indicator of 'global warming'.
The following information has been extracted from the daily weather observations made at Hurley during 1953-1992. This is a rural site.