September 2016 Weather

A warm and largely dry start to autumn this year, the first half of September being particularly warm with temperatures rising as high as 28.4 C (83.1 F), a new station record for this nine month of the year. However the most notable new record of the month came on the night of the 6th/7th when a minimum of just 18.8 C (65.8 F) was recorded, this not only being a new September record but also the warmest ever minimum recorded at our weather station since records began in 2003. Overall it was the second warmest September on our records and the warmest since 2006, the month eventually concluding some 2.1 C above the long-term average (1981-2010).

Meanwhile rainfall was again notably below the long term average, the monthly total of 36.0 mm (1.42 inches) coming to 62% of what would usually be expected in a typical September. 12 days saw measurable rainfall but only nice saw in excess of 1.0 mm, the wettest day of the month coming on the 3rd when 11.7 mm was measured via the manually recorded Met. Office standard rain gauge.

The dominance of south-westerly winds was another notable feature of the month, winds from Atlantic dominating the vast majority of September, though by and large winds were rarely more than moderate to fresh throughout the majority of the month. However the 28th and 29th did see some stronger winds with gusts of up to gale force recorded on the 29th. After a succession of relatively benign autumn’s it will be interesting to see what 2016 has in store for us this year.

Finally sunshine totals were close to the long term average with around 98% of the normal being recorded. Daily sunshine totals averaged exactly 4.8 hours, though four days did remain sunless, a slightly higher than usual occurrence for September. The sunniest weather came during the first half of the month, the first 15 days seeing 88.9 hours of sunshine compared to 55.1 hours in the remaining 15 days, though the reduction in daylight hours as September advances does partly account for this difference. One of the most notable features of autumn’s in recent years has been an increase in sunshine hours and it will be interesting to see whether this continues again this year.

AVERAGE TEMPERATURE : 16.1 C   (+2.1 C)
AVERAGE MAXIMUM : 19.9 C
AVERAGE MINIMUM : 12.2 C
HIGHEST MAXIMUM : 28.4 C, 13th
LOWEST MAXIMUM : 14.8 C, 26th
HIGHEST MINIMUM : 18.8 C, 7th
LOWEST MINIMUM : 7.2 C, 23rd
GRASS FROSTS : 0
AIR FROSTS : 0
FROST DURATION : 0 hours

TOTAL RAINFALL : 36.0 mm   (62%)
MAXIMUM TOTAL : 11.7 mm, 3rd
DAYS =>0.2 mm : 12
DAYS =>1.0 mm : 9
DAYS =>10.0 mm : 1
TOTAL RAIN DURATION : 48 hours

TOTAL SUNSHINE : 144.0 hours   (98%)
AVERAGE PER DAY : 4.80 hours
SUNLESS DAYS : 4

AVERAGE WIND SPEED : 1.6 knots
MAXIMUM GUST : 34 knots, 29th
DAYS =>34 knots : 1

WIND DIRECTION FREQUENCY
N 2, NE 2, E 0, SE 2, S 0, SW 18, W 2, NW 4

AVERAGE PRESSURE : 1014.7 hPa
MAXIMUM PRESSURE : 1022.6 hPa, 23rd
LOWEST PRESSURE : 1003.1 hPa, 8th

DAYS WITH FOG : 1
DAYS WITH THUNDER : 0
DAYS WITH HAIL : 0
DAYS WITH SNOW FALLING : 0
DAYS WITH SNOW LYING : 0
MAXIMUM SNOW DEPTH : 0 cm
MONTHLY SNOW INDEX : 0 cm/days

september-2016
September 2016 Logbook (click to enlarge)

1st September 2016, Thursday
12.0 C to 21.0 C / 2.0 mm / 8.1 hours / SW 3
A sunny start to September and the first month of the meteorological autumn, with a mostly fine and clement day following with alternating sunny spells and cloudier periods. However a gentle to moderate breeze did mean it felt a little fresher than it has of late. Variable amounts of cloud in the evening and at first overnight but cloud would increase later with a period of heavy rain around 3 am (peak rainfall rate of 22.6 mm/h). Clearing by dawn.

2nd September 2016, Friday
13.5 C to 19.4 C / trace / 1.2 hours / SW 2-3
A mostly cloudy start to the day, the cloud thick enough to produce some drizzle in mid-morning but becoming drier by the end of the morning. Remaining dry but cloudy throughout most of the afternoon, though towards the end of the afternoon some breaks would begin to develop with some occasional sunny spells during the evening. Variable amounts of cloud overnight.

3rd September 2016, Saturday
11.8 C to 16.6 C / 11.7 mm / 1.1 hours / SW 3
A bright start but soon becoming cloudy, this cloud thickening as the morning progressed with rain arriving from the west shortly before midday. This rain would become persistent in the afternoon with moderate to heavy spells at times (peak rate of 7.8 mm/h), though eventually it would begin to ease and turn more drizzly, dying out altogether by mid-evening. Cloudy but largely dry overnight, though around 4 am a short period of rain would pass through, this clearing by dusk.

4th September 2016, Sunday
12.7 C to 19.3 C / trace / 5.3 hours / NW 4
A breezy and fresh sort of morning with sunny spells and occasional drizzly showers, though by the afternoon these showers would die out with alternating sunnier and cloudier periods for the rest of the day. Feeling cooler than of late, especially in the north-west breeze. Variable amounts of cloud in the evening and overnight with some decent clear spells at times.

5th September 2016, Monday
11.5 C to 21.4 C / trace / 3.5 hours / SW 3
A dry and clement day for the most part with alternating sunny periods and cloudier spells, though for a time in the afternoon it would become quite grey, this cloud producing nothing in the end despite looking quite threatening. Becoming clearer for a time in the evening but cloud and murk would arrive after midnight, this cloud thick enough to produce some light drizzle. It would also become noticeably warmer and muggy overnight with both temperatures and dew points climbing up into the high teens by dawn. Indeed the overnight minimum was a rather warm 15.0 C.

6th September 2016, Tuesday
15.0 C to 25.6 C / 0.0 mm / 5.3 hours / SW 2-3
A cloudy and very humid start, temperatures and dew points in the high teens even at dawn, and whilst it would remain mostly cloudy throughout the morning, some brighter spells would begin to develop by midday. Alternating sunny spells and cloudier periods in the afternoon with temperatures climbing up above 25 C (dew points reaching a rather muggy 21 C), though towards the end of the afternoon a gentle breeze would help to make things feel that little bit fresher. Variable amounts of cloud in the evening and at first overnight, but like yesterday it would become cloudy and grey with overcast skies by dawn. Very mild overnight as well with a minimum of just 18.8 C, this not only being a new September record but also the highest ever minimum recorded at our weather station.

7th September 2016, Wednesday
18.8 C to 24.4 C / 0.0 mm / 4.3 hours / SE 2-3
A dull and overcast start to the day, things once more feeling rather humid and muggy, but as the morning wore on it would become brighter with sunny spells developing by the end of the morning. Feeling very warm in the sunshine with temperatures rising into the mid-twenties, whilst dew points were up around 19 C. Remaining fine for much of the afternoon with sunny spells, though cloud would increase later with things once more becoming mostly cloudy by the end of the afternoon and into the evening. Mostly cloudy for much of the night but becoming clearer later.

8th September 2016, Thursday
14.3 C to 22.3 C / 0.0 mm / 9.5 hours / SW 4-5
A fine and clement day with an abundance of sunshine throughout, though during the middle of the day it was quite breezy with gusts of up to nearly 30 knots. Feeling much fresher than the last couple of days as a result, though still warm for the time of year with temperatures reaching a maximum of 22.3 C. Clear spells in the evening and overnight with the breeze easing.

9th September 2016, Friday
13.2 C to 22.8 C / 1.6 mm / 5.5 hours / SW 4
A sunny and fine start to the day, a moderate southerly breeze making it feel much fresher than recent mornings, and it would remain sunny and clement throughout the remainder of the morning and for most of the afternoon, temperatures reaching a pleasant high of 22.8 C. However in the evening cloud would begin to increase with this cloud bringing some outbreaks of rain during the night.

10th September 2016, Saturday
13.9 C to 15.3 C / 1.4 mm / 0.1 hours / SW 1-2
A dull morning with occasional outbreaks of light rain, the rain becoming somewhat heavier and more persistent for a time around the middle of the day. As the winds swung around into the north-east the rain would turn lighter and more drizzly, and indeed by the time the wind had continued into the north the rain would have cleared, the odd break in the cloud even managing to develop by early evening. Skies continuing to clear overnight with temperatures dipping into single figures.

11th September 2016, Sunday
8.3 C to 19.8 C / 0.0 mm / 11.8 hours / SW 2-3
A lovely early autumn morning with plenty of sunshine bathing the countryside of the East Riding, and it would remain summery and clement into the afternoon with wall to wall sunshine by the end of the afternoon. Skies remaining clear in the evening and overnight with a heavy dew by dawn.

12th September 2016, Monday
10.9 C to 23.7 C / 0.0 mm / 7.0 hours / SW 2-3
A sunny morning again with plenty of sunshine to enjoy, the temperature rising up into the mid-twenties by early afternoon, though as humidity and dew points rose in the afternoon cloud would also increase with skies becoming cloudy for a time. However sunshine would return in the evening with skies becoming clear once more overnight, this allowing mist patches to form by dawn.

13th September 2016, Tuesday
14.0 C to 28.4 C / 0.0 mm / 9.1 hours / NE 2-3
A fine start to the day with largely clear skies and low mist hanging over the fields, and it would remain largely clear and sunny throughout the morning and indeed the afternoon with temperatures rising up above 80 degrees Fahrenheit. Indeed the maximum of 28.4 C is a new September record for the weather station, beating the 26.8 C recorded way back in 2006! It was also rather muggy with dew points rising as high as 21 C for a time, this making it feel rather continental. Mostly clear in the evening and overnight with temperatures remaining above 15 C throughout.

14th September 2016, Wednesday
15.3 C to 24.1 C / 0.0 mm / 10.1 hours / NE 3
A sunny and muggy start to the day with light mist patches again in rural areas, and as the morning wore on the skies would remain clear and sunny with an abundance of golden September sunshine bathing the East Yorkshire countryside. Remaining clear and sunny throughout the afternoon, though thanks to a cooling breeze coming in off the sea it would be much more comfortable than yesterday with temperatures peaking at a pleasant 24.1 C. Clear skies in the evening and at first overnight but after midnight low cloud and murk would come in off the sea with foggy conditions by dawn.

15th September 2016, Thursday
13.9 C to 23.5 C / 0.0 mm / 7.0 hours / NW 3
A foggy start to the day, a phenomena which has been quite scarce this year, and whilst visibility would improve after 9 am, it would nevertheless remain grey and cloudy for most of the morning. However around midday it would begin to brighten up with yet another sunny and warm September afternoon following, temperatures once more rising up above 70 degrees Fahrenheit. Mostly clear in the evening but becoming misty and eventually foggy after dusk, though after midnight a freshening NW breeze would blow the fog away. Remaining overcast however.

16th September 2016, Friday
14.0 C to 17.4 C / 8.1 mm / 0.4 hours / NW 5
A dull and overcast morning with persistent, and at times heavy rain arriving shortly before 11 am, this rain continuing into the first half of the afternoon. However by 3 pm the rain would clear away to the east leaving behind grey skies and a fresh blustery wind, though eventually some breaks would manage to develop by the evening, this allowing some late spells of sunshine to finish the day. Becoming cloudy again overnight with the breeze easing.

17th September 2016, Saturday
13.2 C to 17.0 C / 0.0 mm / 0.0 hours / N 4
A cloudy day for the most part with temperatures around average for the time of year, the ground remaining damp all day after yesterday’s rain. Cloud beginning to break up in the evening with skies becoming clear overnight, this allowing a heavy dew with temperatures dipping into single figures.

18th September 2016, Sunday
8.0 C to 20.4 C / 0.8 mm / 10.4 hours / W 2
A sunny and clement autumn day with an abundance of blue skies throughout, this helping to push temperatures up above 20 C. Indeed with light winds it felt rather warm again. Remaining clear in the evening and during the first half of the night but cloud would increase later with grey skies by dawn.

19th September 2016, Monday
9.3 C to 15.2 C / 4.7 mm / 0.0 hours / NW 2-3
A dull, overcast and damp day with periods of steady drizzle in the morning and the first half of the afternoon, though it would become somewhat drier by the end of the afternoon. Indeed by the end of the evening some breaks would develop with clear spells during the first part of the night. However cloud would increase again by midnight with overcast skies and drizzle by dawn.

20th September 2016, Tuesday
12.9 C to 15.3 C / 1.5 mm / 0.0 hours / N 2
Another damp and overcast day with periods of drizzle and rain in the morning, the ground becoming particularly wet after a couple of overcast days and light winds. Somewhat drier in the afternoon but remaining overcast and grey with further occasional periods of rain &/or drizzle from time to time. Overcast overnight and becoming misty by dawn.

21st September 2016, Wednesday
11.7 C to 18.9 C / trace / 1.4 hours / SE 2-3
A dull and misty morning but becoming brighter after midday with some good spells of sunshine developing by mid-afternoon, this allowing temperatures to rise up to a rather clement 18.9 C. Becoming cloudy again by the evening with a mostly cloudy and mild night following.

22nd September 2016, Thursday
12.8 C to 18.2 C / 0.0 mm / 6.2 hours / SW 2
After an initially cloudy start things would soon brighten up with some good spells of sunshine developing by the end of the morning, the sunny and clement conditions persisting throughout the afternoon. Indeed by the evening skies would become clear with mostly clear conditions persisting throughout the night. A cooler night as a result with temperatures dipping into single figures.

23rd September 2016, Friday
7.2 C to 18.6 C / 0.0 mm / 9.0 hours / SW 2-3
A sunny and clement early autumn day with an abundance of sunshine bathing the countryside of Yorkshire’s East Riding, temperatures once more being slightly above average for the time of year. Indeed this month looks like it could be one of the warmest September’s on my records. Clear spells in the evening and overnight but notably milder than the previous night.

24th September 2016, Saturday
10.7 C to 21.4 C / 0.3 mm / 5.0 hours / SW 3-4
A bright start to the day with sunny spells and it would remain clement into the first part of the afternoon with temperatures climbing up to a rather warm 21.4 C. However cloud would increase as the afternoon wore on with skies becoming cloudy by mid to late-afternoon, the breeze also freshening as the cloud invaded from the south. Remaining cloudy throughout the evening and overnight with some outbreaks of rain arriving towards the end of the night.

25th September 2016, Sunday
12.8 C to 18.0 C / 0.0 mm / 4.9 hours / SW 4
A damp start with outbreaks of mostly light rain but this would quickly clear with conditions gradually brightening up as the morning progressed. Indeed by the afternoon some good spells of sunshine would begin to develop, though with a moderate to fresh SW breeze it did feel somewhat fresher than it has of late. Variable amounts of cloud in the evening and overnight.

26th September 2016, Monday
9.3 C to 14.8 C / 2.3 mm / 0.0 hours / SW 2-3
A fiery sky to start the day soon gave way to cloudy and grey skies, this cloud being thick enough to produce some periods of rain in the second half of the morning and again in late afternoon and the evening. Much cooler than of late with the temperature remaining below 15 C for the first time since the 2nd of June! After a drizzly evening conditions would begin to improve overnight with some clear spells managing to develop by the end of the night.

27th September 2016, Tuesday
10.6 C to 19.4 C / 0.0 mm / 0.6 hours / SW 4-5
After another fiery start to the day, the eastern dawn sky lit up bright orange, cloud would once more quickly increase from the south with the remainder of the day seeing largely cloudy and grey skies, though in the afternoon the odd brighter period would also allow some short spells of sunshine. Indeed despite the cloud and a moderate to fresh SW breeze it would feel rather warm, temperatures falling just shy of 20 C. Remaining mostly cloudy and breezy in the evening and overnight with temperatures falling no lower than 12.7 C, rather mild for late September.

28th September 2016, Wednesday
12.7 C to 21.5 C / 0.2 mm / 1.3 hours / SW 4-5
A largely cloudy day once more but not without some brighter periods, especially in the afternoon. However it was the return to warm and muggy conditions which was the most notable feature of the weather today with temperatures climbing into the low twenties despite the cloud, and dew points reaching a rather muggy 18 C. It was also quite breezy during the morning but this would ease by the afternoon. Becoming clearer for a time around dusk but cloud would increase again by midnight, the cloud thick enough to produce some light rain by the end of the night.

29th September 2016, Thursday
13.9 C to 17.4 C / 0.0 mm / 8.8 hours / W 5-6
After early light rain cleared away, it would quickly brighten up with a largely sunny, if somewhat blustery day following. Indeed the wind would be quite strong at times in the afternoon with gusts up to gale force, and as a result of the fresh breeze it would feel much cooler than yesterday. Skies becoming mostly clear by the evening with a fresh and pleasant end to the day.

30th September 2016, Friday
8.2 C to 16.1 C / 1.4 mm / 7.1 hours / SW 4
A clear and sunny start to the day with skies remaining largely sunny and clement throughout most of the morning and the afternoon. However latterly the odd shower would bubble up, one of which was quite sharp (28.4 mm/h) in early evening, but these would soon die out with clear spells developing overnight. Under mostly clear skies temperatures would dip well into single figures with a low of 5.6 C by dawn, the lowest minimum so far this autumn.