Tag Archives: London weather

August 2019: warmest for 4 years

Apart from the hot four days in the last week August 2019 was fairly unremarkable.

Overall the monthly mean finished 19.9C, that’s 1.4C above average.

Rainfall at 37.7mm, was 75 per cent of average,  the driest for 3 years. Sunshine, at 180hrs, the sunniest for 3 years.

To view full stats follow this link:http://1drv.ms/1kiTuzv

august max

Summary for August 2019:

Temperature (°C):

Mean (1 minute)  18.9
Mean (min+max)   19.3
Mean Minimum     13.9
Mean Maximum     24.7
Minimum          8.8 day 20
Maximum          32.6 day 27
Highest Minimum  19.5 day 07
Lowest Maximum   17.9 day 14
Air frosts       0
Rainfall (mm):
Total for month  37.7
Wettest day      12.6 day 14
High rain rate   65.8 day 09
Rain days        11
Dry days         20
Wind (mph):
Highest Gust     22.1 day 10
Average Speed    2.6
Wind Run         1941.4 miles
Gale days        0
Pressure (mb):
Maximum
Minimum
Days with snow falling         0
Days with snow lying at 0900   0
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The night London slept out in the heatwave

Sleeping in heatwaves is never a great prospect even in an age where fans and air conditioning units are becoming more and more common.

In 1948, however, residents of Kensington and other areas of London were so hot and desperate to escape oven-like houses caused by temperatures well into the 90s that they decamped en masse into the streets and local parks to get some kip.

A report published in the Aberdeen Journal on Friday 30th July describes how folk down south were coping with the heat.

“The metropolis last night was like a large restless household—with all the lights ablaze, doors and windows thrown open, the family fretful, and endless pots of tea brewing far into this morning.

aspro heatwave ad Yorkshire Post and Leeds Intelligencer - Wednesday 13 August 1947“Perhaps one in ten among the 8,000,000 of us slept after midnight. For the rest, we tossed and turned and saw out this heatwave night, when temperatures were never below 71 degrees, a variety of ways. About midnight I walked past the gaunt old Edwardian mansions in Kensington. With the exception the lights that burned from every window, the scene was reminiscent of the early days of the Blitz.

“Families trekked across the roadway in varying stages of undress to their little bits of ornamental gardens. With them went camp beds, bed linen, umbrellas, “in case,” the children, and the household pets, choose a cool open-air camping spot and feel wonderfully adventurous and spartan in the process.”

“At regular intervals the adolescent members of the squatting colonies were dispatched to the tea and coffee stalls on the corner, and perhaps for the first time in years these traders ran out of stocks. On the Kensington-Chelsea boundary, where life becomes noticeably less inhibited and on occasions less swish, a mixed group of young artists was sleeping on the pavement off Fulham Road.

“Round the next corner, where many theatrical and film stars live, several had slung hammocks on their meagre front lawns – one actually suspended between the bathroom windows of two adjacent houses. Midnight street wear for both sexes was cool if unconventional —silk pyjamas, bath robes, tennis shorts, and one in kilt and bathing costume top who could have gone straight into the arena at Lonach.”

The temperature at Westminster that night never fell below 23.3C (73.9 F), a record for July that still stands.

The column goes on to describe the situation in the House of Commons where the heat had reached “almost Turkish bath intensity”.

“Some members were in natty tussore silk suitings, but this helped little, and it was many of their number who appealed to the Speaker to have more windows opened. The Speaker, panting like the rest of us, said they were all open. If they wanted more cool breezes from the Thames, members would have to smash the windows.”

This hot spell and others features in my Premier League of Heatwaves.

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Wild equinox brings memories of childhood

Wild weather in the run up to the autumnal equinox was frequently a staple of the Septembers of my childhood but it has been absent in recent years.

Since 2013 I have been recording the ‘wind run’ data on my AWS, a stat generated by the amount of times the anemometer spins.

wind run

The results show there has been nearly two-and-a-half times more wind than the 5-year average.

Stormy weather over the equinox is one of the less frequent recurring singularities. The meteorologist Philip Eden a few years ago noted that ‘Mid-September storms’ during the period of 17th to 24th September had a frequency of 60 per cent.

20th
The wind run was the highest on 20th

London’s August extremes since 1959

I’m running out of superlatives for this summer. There has already been 15 days where the temperature has reached or exceeded 30C, two more than 1976!

However, the mean temperature has not been as intense as that classic summer where two heatwaves of five days and four days length were featured during the season. This summer has so far only seen one similar heatwave of 5 days length.

I’ve put together a few top 10s of stats for Wanstead, St James’s Park and Heathrow for the month of August.

august top ten wans

august SJP

august heathrow

Some national UK August values according to TORRO

Hottest: 38.5C Brogdale, near Faversham, Kent – 10th 2003
Coldest: -4.5C Lagganlia, Highland – 21st 1973
Wettest: 238.8 Cannington, Somerset – 18th 1924

In terms of climatology August maxima, considering the 1981-2010 average, shows a fairly steady decrease through the month, though around the 15th there is often a spike before a steady decrease to month’s end. This would reflect the late August winds singularity which occurs every year around the 20th at 67 per cent probability.

august av max

The average rainfall graphic shows that downpour amounts are fairly random from year to year. The driest days are the 15th and the 30th.

aug av rain

 

London’s July extremes since 1959

Recent weather patterns have seen much high pressure to our north keeping us dry and mostly sunny but, aside from June, protected from humid Spanish plumes.

A look at local east London stats shows that half of the last 10 July months have been warmer than average while only two have been much drier than average.

I’ve put together a few top 10s of stats for Wanstead, St James’s Park and Heathrow for the month of July.

july1959WAN

july heathrow

sjp july

Some national UK July values according to TORRO

 

Hottest: 19th 2006: 36.5C at Wisley, Surrey.
Coldest: 15th 1977: -2.5C at Lagganlia, Highland.
Wettest: 18th 1955: 279.4.8mm at Martinstown Dorset.

july av mxIn terms of climatology July maxima, considering the 1981-2010 average, shows a fairly steady increase through the month, though around the 17th there is often a dip before a warm end. This would reflect the July heatwave singularity which occurs every year at 80 per cent probability.

The average rainfall graphic shows that downpour amounts are fairly random from year to year. The driest days are the 1st and the 25th. july av rn

 

London’s June extremes since 1959

With the recent warms months of April and May you’d be forgiven for thinking that we’re in for a hot summer. Indeed the recent pattern of weather, would it repeat over the next month, could see many maxima records tumbling.

A look at local east London stats shows that six of the last 10 Junes have been warmer than average while half have been much drier than average.

I’ve put together a few top 10s of stats for Wanstead, St James’s Park and Heathrow for the month of June.

Probably most notable from the below values is that recent Junes have been devoid of extreme cool temperatures and rainfall.

Snow has been known to fall in June, in 1975.

Rain is usually most frequent in the last week of the month.

june extremes wans

heathrow june

june sjp

The 10 driest Junes were:

 

Some UK May values according to TORRO

Hottest: 29th 1957: 35.6C at Camden Square, London. Also Southampton 28th 1976
Coldest: 9th 1955: -5.6C at Dalwhinnie, Highland. Also June 1st and 3rd 1962: Santon Downham, Norfolk
Wettest: 28th 1917: 242.8mm at Bruton, Somerset

Screen Shot 2018-06-06 at 12.11.18In terms of climatology June maxima, considering the 1981-2010 average, shows a gradual increase through the month, though around the 19th to the 21st there is often a dip before a warm end. This would reflect the June Monsoon which occurs every year at 77 per cent probability.

The average rainfall graphic reflects this, showing a four-day wetter spell after the 20th.

Screen Shot 2018-06-06 at 12.29.10

 

 

 

 

More anomalous warmth for late May Bank Holiday?

Weather models are hinting that this coming bank holiday weekend could be very warm indeed, with one WX Charts animation suggesting that a positive anomaly of 12C could be possible on Monday.

A date record looks a formality and, unless there’s a downgrade, new monthly high temperature records at stations across the south-east look a possibility.

While it looks very warm it is too early to start talking about heatwaves. And, considering the pattern since late February, with hot and cold alternating weekly, a brief return to much cooler conditions at the beginning of June can’t be ruled out.

The British record high temperature for May is 32.8C, reached on two occasions:

Camden Square, London May 22nd 1922. The same station recorded this value again on May 29th 1944, along with Regents Park, Horsham and Tunbridge Wells.

The national date record for the 28th, according to TORRO, is 30.6C at Camden Square.

Locally the highest temperature recorded in this area in May is 32.1C on May 27th 2005. The date record I recorded is 26.5C in 2012.

 

 

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London’s May extremes since 1959

Ne’er cast a clout till May is out. With the recent March and April weather being so variable it would be wise to bear in mind this old saying, especially with fine and warm weather forecast for the Bank Holiday weekend.

A look at local east London stats, however, shows that seven of the last 10 Mays have been warmer and drier than average.

I’ve put together a few top 10s of stats for Wanstead, St James’s Park and Heathrow for the month of April.

Probably most notable from the below values is that recent Mays have been devoid of extreme cool temperatures and rainfall.

With nights now relatively short air frosts are uncommon though the odd ground frost can still strike on a clear night.

Snow can fall in May – one example being 1979 in the higher parts of the capital – but after the first week it is extremely rare.

Rain is usually most frequent in the last week of the month.

wanstead may

SJP may

heathrow may

 

 

 

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Some UK May values according to TORRO

Hottest: 22nd 1922: 32.8C at Camden Square, London.
Coldest: 2nd 1917: -9.4C at Lynford, Norfolk
Wettest: 8th 1884: 172.2 at Seathwaite, Cumbria

 

In terms of climatology May maxima, considering the 1981-2010 average, shows a gradual increase through the month, though around the 25th there is often a brief dip before a warm end.

The average rainfall graphic reflects this, showing a three-day wetter spell after the 24th.

max max

 

may rain

 

 

London’s April extremes since 1959

April showers bring spring flowers… so the saying goes though a look at local east London stats shows that eight of the last 12 Aprils have been drier than average, some remarkably so.

I’ve put together a few top 10s of stats for Wanstead, St James’s Park and Heathrow for the month of April.

Probably most notable from the below values is that 5 of the top 7 maxima were recorded during a warm spell in 2011.

Frosts can be common and are often sharp, playing havoc with budding plants

Snow can fall in April – a good few inches fell early in the month in 2008 – though any accumulation is usually short lived.

Rain – the characteristic April showers – is usually most frequent at the end of the month.

 

april updated 1959

SJP april

heathrow apr

 

The chart slideshow below show the synoptic situation which brought a notable warm spell in the second half of April 2011.

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Some UK April values according to TORRO

Hottest: 16th 1949: 29.4C at Camden Square, London.
Coldest: 2nd 1917: -15C at Newton Rigg, Cumbria
Wettest: 22nd 1970: 182.1mm at Seathwaite, Cumbria

In terms of climatology April maxima, considering the 1981-2010 average, shows a gradual increase through the month, though around the 21st there is often a jump of 3-4C, the start of a warm spell before rain arrives at month’s end.

The average rainfall graphic reflects this, showing a three-day drier spell after the 20th.

april max

april rain

 

 

 

 

 

The cold spell of January 1826

This weekend marks the start of a cold spell that brought widespread wintry conditions across Britain.

Entries in Luke Howard’s Climate of London detail several instances of the wintry weather reported nationwideScreen Shot 2018-01-06 at 01.41.17.

In London the freeze lasted 10 days, briefly losing its grip on the 19th, before returning in the final week. At its lowest on the night of the 14th the temperature fell to 10F (-12C). Despite the intense cold their was little precipitation in this area. However, across the country came reports of deep snow and hardship for shipping.

Gale force easterly winds were reported in Plymouth, Falmouth, Liverpool and Portsmouth on January 7th and 8th. On January 9th a ‘hard ENE’ly gale’ was reported at Deal, Kent.

A report reads: “It has continued blowing strong from the eastward all this day. On Thursday morning between one and two o’clock as a person was passing through Paternoster Row he observed the watchman on that beat in a state of complete paralysis and insensibility occasioned by the frost.

“He had him immediately removed to the watch house of Farringdon, within where he had not long arrived when a fellow sufferer was brought in by two of the patrol who found him in his box in Stationers Court, Ludgate Hill, absolutely frozen and unable to articulate a syllable.

“Both were immediately placed near the fire the influence of which combined with the administration of warm cordials shortly restored their suspended faculties. The thermometer at the Royal Exchange yesterday at 12 o’clock stood at 28F.”

An entry on January 14th, nearly a week into the freeze, reported a Thames “choked up with ice”.

“The river is so completely choked up with ice that the fishing boats with fish dare not come higher up than Limehouse. Putney Bridge arches are choked up with ice formed by the ebbing and flowing of the tide to a great height. At one o’clock yesterday afternoon (16th) the fog in the city was as dense as we ever recollect to have known it.

“Lamps and candles were lighted in all the shops and offices and the carriages in the streets dared not exceed a foot pace. At the same time five miles from town the atmosphere was clear and unclouded with a brilliant sun.

“Fahrenheit’s thermometer stood at 14F at 8 o’clock in the morning.

Around Britain

Newcastle: on Sunday morning last a severe frost set in here and has continued since. A considerable quantity of snow has fallen during the week.

Sunderland: the river Wear has been frozen over for the last four days down to Hilton Ferry within four miles of this town. The navigation above that place is entirely suspended.

Carlisle: a smart frost set in here on Monday morning and has continued gradually increasing up to this day Friday in severity. The river Eden is more than half frozen over near the bridge and many persons are diverting themselves on its surface. On Tuesday we had a partial fall of snow which still continues.

Westmorland: on Stainmore the weather has been more severe during the last week than it has been known for four years past. The frost is not only more than usually intense but the snow lies in fearful drifts and the wind on Friday and Saturday blew a perfect hurricane rendering it extremely difficult if not dangerous to travel.

Chester: the frost during the last week has been intensely severe and the wind is gentle and blowing almost constantly from the eastward. The thermometer on Saturday morning stood at 17F or 15F below the freezing point.

Manchester: on Friday last the temperature in the city was as low as 16F and this in the very centre of the town where the crowded buildings and immense fires kept in the manufactories must have had some effect on the atmosphere. On the 18th of January 1814 the extreme temperature was 22 below the freezing point. On the 21st of February 1810 it was the same.

Liverpool: the weather during the last week has been intensely cold, the thermometer for the last few days having been lower than during the past five years. A self registering thermometer denoted the extreme of cold on Saturday night to have been 19F and yesterday, Sunday morning at half past seven, it stood at 20F. It is very probable the present weather may continue several days as it commenced with the new moon.

Bridgewater: our river is so completely frozen over as to impede the navigation fortunately there is a good supply of coals in the town.

Canterbury: On January 17th the river Medway is frozen over and the navigation is stopped. The merchants have advanced the price of coals six shillings a chaldron.

The Royal Military Canal being now completely frozen over numerous parties are daily skating thereon. It is not unusual to take a breakfast at Hythe, a luncheon at Rye (about 20 miles glide) and return to Hythe to dinner.

On the continent

Elsineur:  the sound is full of ice and the navigation suspended. (January 14th ).

Hamburg: the frost is very intense and every appearance of its continuance. Extract from a private letter dated ‘Cadiz Jan 24’: ‘We have had terrible gales at this place so violent that upwards of two hundred and fifty vessels were driven on shore.

Rotterdam: We have had frost again from the 25th but very moderate and the ice has but little increased. The wind prevails from the eastward and there is no appearance of a thaw.

Antwerp: the river continues full of drift ice. An easterly wind took place on the 25th January. The ice decreases very fast (31st) and if the thaw continues for which there is every appearance the river will be navigable in two days.

The mean temperature for the month finished 0.7C, the 14th coldest January in London back to 1797. Just 5.1mm of precipitation was recorded, the second driest January in the series. Screen Shot 2018-01-06 at 22.31.39