October 2018 – 1st to the 18th, Warmer than normal

A little over halfway through this month and so far it has been warmer than normal by both day and night.

Rainfall above average and sunshine somewhat below.

1st – 18th
Mean minimum = 9.8C
Mean maximum = 17.5C
Mean = 13.7C
Rain = 49 mm
Sunshine = 67 hours.
Days of no sunshine = 3.

A rare, early October grass frost recorded on the 7th (-1.1C). Only 4.1 hours of sunshine recorded from the 12th – 17th!!

A windy day thanks to Storm Callum

Not quite as windy here in this reasonably sheltered river valley spot as other areas of the South West but we are exposed somewhat to the south (the coast) and the wind was frequently gusting over 40 mph with one gust reaching 52 mph. This is the highest wind speed I have recorded this year.

Rain has mainly been in the form of drizzle but there have been the odd heavier bursts. Today’s rain now up to 15.6 mm. Monthly total at 25.2 mm.

Wind has eased off a little recently but still hovering around 25 to 35 mph. A few trees and large branches down here and there. Exmouth seafront was impassable in places due to flooding from the waves crashing over the wall. Any cars left alongside the Esplanade in Sidmouth will have been totally pebble-dashed by now. Dangerous to walk along there without a hard hat on.

Warm October Nights Ahead

Another pleasantly warm October day with a maximum of 21.7C and pretty much unbroken sunshine all day.

Looking at the forecast, there could be some unusually warm nights over the next few days.

My highest October minimum was 16.9C on the 3rd in 2013. Overnight Friday and into Saturday morning looks like a contender. Maybe a minimum of 17C to 18C?

Temperature holding up this evening at 17C but no record on the cards methinks as the sky is clear.

October Warmth

A mostly sunny and warm day with a maximum of 22.5C.

This makes it the warmest October day since 2011 with 25.6C on the 3rd.

Dew points were around 17C for most of the afternoon making the gentle sea breeze feel soft and warm. With the first hints of autumnal colour starting to appear and the deep blue sky, it made for a beautiful, colour contrasting day.

Sea breezes in October are not common and we’ve had quite a few lately.

A mild, calm evening – feeling more like summer than autumn.

Summary of September 2018

Mean temperature, rainfall and sunshine all around the average in what was a rather non-average month with wide variations throughout. Mostly a dry month except for 4 days (20th – 23rd) when 47.0 mm of rain fell, that’s 91% of the monthly total. A notable windy spell for September from the 16th – 21st in what was otherwise a calm month. Highest September pressure recorded on the 24th with 1039.5 hPa. A run of very cold nights from the 24th – 30th. Coldest September day on record on the 22nd with 12.7C. I could go on….. So a very interesting month even if the statistics show otherwise.

Mean Max: 20.3ºC
Mean Min: 9.6ºC
Mean: 15.0ºC

High Max: 25.9ºC 3rd
Low Max: 12.7ºC 22nd
High Min: 17.0ºC 2nd
Low Min: 1.3ºC 25th
Grass Min: 0.6ºC 25th

Days >20°C 18 Days
Days >15°C 29 Days
Nights >10°C 14 Days
Nights >5°C 23 Days

Rain Total (gauge): 51.9 mm
Rain Days >0.2 mm: 7 Days
Rain Days >1.0 mm: 6 Days
Max 24 hrs: 25.6 mm 22nd
Days without any rain: 23

Thunder Heard: 0 Days
Hail <5 mm: 0 Days
Hail >5 mm: 0 Days
Fog @ 9am: 0 Days

Total Monthly Sunshine: 178.6 Hours
Most Sunshine in a Day: 11.3 Hours 26th
Average Daily Sunshine: 6.0 Hours
Sunless Days: 1 Day 22nd
Cloudless Days: 3 Days
Total Possible Sunshine: 378.5 Hours
Percentage of Total Sun: 47%
Average Sunny Interval: 18.8 mins

Ave 10 Min Wind >39 mph: 0.00 Days
Calm: 5.97 Days 22%
Mean Wind: 3.4 mph
Max Gust: 42 mph 21st

Mean Pressure: 1021.1 hPa
Max Pressure: 1039.5 hPa 24th
Min Pressure: 998.3 hPa 21st

Max Dewpoint: 19.5ºC 11th
Min Dewpoint: 0.4ºC 25th
Mean Dewpoint: 11.2ºC

Max Humidity: 100% 26th
Min Humidity: 32% 26th
Mean Humidity: 80%

The Year So Far

1st January – 30th September 2018

Mean max = 17.3C
Mean min = 7.6C
Mean = 12.5C
Rain = 520 mm
Sun = 1652 hours

Snow falling = 7 days
Snow lying = 4 days
Air frost = 31 days
Ground frost = 62 days

These data all look around the average though maybe the number of air and ground frosts are higher than I would expect. Snow falling days are high; they’re usually 2 or less.

27th September 2018 – Large Temperature Inversion

A huge temperature inversion here in the Otter Valley this morning. Left home about 8:30 and the car thermometer was showing just 3°C but this rose abruptly to 14°C halfway up Four Elms Hill between here and Sidmouth.

Normally the inversion boundary yields a temperature difference of 4°C or 5°C at most – not 11°C!

Also it is quite interesting to note that as you meet the inversion boundary the car’s windows suddenly mist up. I’ve got used to it now and expect it whenever there is an inversion but when I first encountered it, I was a bit shocked to suddenly lose sight of the road as all the windows (and door mirrors) mist up on the outside whilst driving up the hills on either side of the valley.

A maximum of 22.8°C and unbroken sunshine all day. Temperature held back a little by a sea breeze that started early this afternoon.

Sunshine recovering at 157 hours but still a way to go to get to the average for the month so far.

Stunning late summer’s day (or is that early autumn…)

A totally stunning day with a pristine, deep blue sky all day and ending up surprisingly warm after a chilly start.

A maximum of 22.3C and 11.3 hours of sunshine.

A sea breeze sparked up at 13:30 with a sudden wind-shift from the NNW to the south and an accompanying increase in the breeze from barely anything (0 to 2 mph) to a steady 9 mph. The temperature also fell back a couple of degrees.

All calm now and the temperature isn’t dropping away like previous nights. A warmer day on the cards for tomorrow then.

Dry September So far

3.8 mm of rain here so far this month though it is raining (lightly) at the moment. The front lawn has gone partially brown again though over the last week or so; there are dead patches that never recovered from the June/July drought. I will have to re-seed those areas.

Soil moisture at 30 cm is now the same as at the end of July. It was very windy, warm and sunny yesterday and the dust blowing around was something you don’t often see here in Blighty.

Looking at the rainfall radar, a possible 5+ mm to come.

I’ve noticed a few native trees are changing leaf colour. This is unusually early, possibly the earliest I’ve ever known. Normally you don’t really start to see any autumnal colour until well into October. Most of the photos I’ve taken over the last few years showing the autumn colour at its best have been taken early to mid-November.

August 2018 – The halfway point

A brief spell of heavy rain early this morning soon cleared (with a sharp clearance) to sunny intervals. Despite being told how much cooler and fresher I will be feeling because of it, the day was still warm and extremely pleasant with moderate humidity.

A maximum of 22.9C and nearly 7 hours of sunshine.

This August (1st – 16th) so far: warmer and wetter than normal; sunshine around the average.

Mean max = 23.8C
Mean min = 12.7C
Mean = 18.3C
Rain = 47 mm
Sunshine = 120 hours.