Summary for August 2013 and Summer 2013

August 2013
August started with a very hot day that peaked at 30.2C, the fifth hottest day that I have recorded. The record of 35.2C was set on 3rd August 1990. There were only four days in the month that did not exceed 20C. The mean temperature was 0.5C above the long-term average, almost identical to 2012 and the warmest since 2004.
It was a relatively dry month with a total of only 43.6mm that is 67% of the long-term average and the driest since 2005. This is in contrast to the massive total of 108.8mm last year. The wettest August was in 1992 with 139.5mm and the driest occurred in 1995 with a mere 5.3mm. Evapotranspiration amounted to the equivalent of 76.9mm of moisture, which is 33.3mm greater than the rainfall total.
There were 308 hours of bright sunshine, which is 20% above the average for recent years. Solar power was 5% above the average for the last few years.

Summer 2013
This was the warmest summer season, with a mean of 16.6C, since the record set in 2006 (17.9C) and was 0.6C above the long-term average.
Summer 2013 was also noted for the relatively low rainfall total of 141.4mm being 77% of the long-term average, It was the driest since 2003. The record for the highest rainfall of 328mm was set last year and the driest in 1995 when only 53mm of rainfall was noted for the whole summer.

Monthly Summary for July 2013

July was a month that brought summer weather at last as it was 1.8C above the long-term average; the maximum was +2.9C and the minimum +0.6C. It was the third warmest July I have recorded and the warmest (18.6C) since 2006 (19.97C) and 1989 (18.91C). A maximum of 31.7C on the 22nd was the highest since 2006 when the record for July of 35.9C, was set on the 19th. There were 19 consecutive days without rain, the longest dry spell since April 2007. During this period the evaporation from plants and the ground amounted to over 85mm of water vapour returned to the atmosphere, many days each in excess of 5mm. The total figure for evapotranspiration was 118.7mm, which meant a deficit over precipitation of almost 55mm even though rainfall was above average.
The rainfall total of 63.8mm was 106% of the long-term average and principally due to heavy rain on three days of 18.2mm,17.6mm and 17.1mm on the 27th, 29th and 22nd respectively. July rainfall, although slightly above average, was so much drier than the recent years of 2009 (113mm) and 2007 (127mm). As the anticyclone drifted away during the last week or so, humidity rose as very warm southerly winds brought thunderstorms on the 22nd, 23rd and 29th.
As a result of the persistent anticyclone, solar energy was 125% of the average for recent years and there were many days with high levels of UV that on the 31st produced an extreme value for late July of 10.0 when the average was 7.7.
Early morning fog was noted on two days during the month along with two very misty mornings.

Monthly Summary for June 2013

June was the sixth successive month with a mean temperature below the long-term average at -0.7C. There were several very cool nights with a low of 3.5C on the 3rd, being the coldest, but a few warm days. A maximum of 25.2C on the 19th was the lowest maximum since 2002. Looking back over the records I note that June 2013 was the coldest June since 1994.
It was the driest June since 2006 with a total rainfall of just 34.0mm, being 59% of the long-term average.
Sunshine total for the month was close to the average although the solar energy total was the highest since 2006.
There were three notable days when UV levels were extremely high during June, with a maximum of 10.4 meds on the 28th.

Summary for May and Spring 2013

May was a very cold month being 1.4C below the long-term average and the coldest since 1996. There were three notably poor days for a spring month. On the 14th the thermometer struggled to reach a maximum of 9.6C (average is 17C) also it was the wettest day with 15.7mm of rainfall. On the 24th a maximum of 10.1C was reached but this was accompanied by gale force winds gusting to 36mph making it feel very cold. Finally in the 28th there was continuous rain throughout the daytime. The total rainfall was 62.7mmm being 108% of the long-term average. The total hours of sunshine was 96% compared to the average of recent years.
The mean temperature was 2.1C below the long-term average making it the second coldest spring that I have recorded as 1984 was marginally colder. Rainfall for the three months totalled 191mm which is 109% of the long-term average.

Monthly Summary for April 2013

April 2013 continued the wintry theme without any early sign of spring, initially. For the first seven days maxima were in single figures with sharp overnight air frosts and a minimum of -5.1C on the 7th. As the persistent northeasterly winds gave way to those from a more southerly direction, temperatures by day and night began to recover. The increased cloud cover brought substantial rainfall amounts from 10th to 13th with a maximum of 14.6mm on the 10th.

Not surprisingly, the mean temperature was 1.1C below the long-term average with a maximum of 18.9C on the 23rd. It was the fifth coldest April over the last thirty years and reminiscent of mean monthly figures for the late 1980’s. Air frost occurred on 10 nights, the highest number since 1997, when the average is just 6 occurrences in April.

The rainfall total of 48.6mm was 80% of the long-term average. It is interesting to note that the total for 2012, of 145.8mm, was three times the quantity recorded in 2013 and in direct contrast to just 5.4mm in 2011.

Snow flurries were seen on the 4th and hail on  the 26th and 27th. Fog occurred on two mornings and early mist on two other occasions.

An unusually raised level of UV radiation was recorded on three days, namely 22nd, 23rd and 25th. The usual level for April is classed as ‘moderate’ but the peak recorded figures were rated as ‘high’ that mostly occur on a few days in May.