Otter Valley Climate

This is only a very brief summary of the climate in the Otter Valley. This is due to the short time this weather station has been based here. As time progresses more detail will be added.

Jacob's Ladder Beach near Sidmouth on a hot May day.
Jacob's Ladder Beach on a hot and sunny day in early May 2008.

The Otter Valley is located in south east Devon and has formed over thousands of years of erosion from the River Otter which starts in the Blackdown Hills to the north and enters the sea at Budleigh Salterton. The Otter Valley is just one of quite a few valleys which run north-south, parallel to each other along this part of the south Devon coastline. There is the Clyst Valley to the west and the Sid Valley to the east with high ridges separating the valleys.

The climate here is described as maritime temperate and the native vegetation is predominantly broad-leaf forest consisting of ash, common oak (not sessile), beech and lime. Introduced species such as chestnut, horse chestnut, sycamore and holm oak also thrive here.

Seasons:

Being on the south coast of Devon and on the South West peninsula of England the climate here is one of the mildest in the British Isles and strongly influenced by the North Atlantic which moderates the temperatures more significantly than places further east and north.

Traditionally the timing of the seasons are said to follow the equinoxes and solstices, i.e., winter being the period between 21st December to March 21st. This may well apply in other parts of the world but here in the south west of England this timing of the seasons has little meaning. Meteorologically the seasons are better defined as Winter = Dec, Jan & Feb; Spring = Mar, Apr & May and so on. This divides the year up into nice, equal parts and is useful for weather recording but is a generalisation for the whole of the British Isles where the climate of northern Scotland is a world away from the climate here in the Otter Valley.

Here are my 'generalisations' for the seasons here in the Otter Valley and they roughly follow the cycles of natural world around us:

Winter (Dec - mid-February): Somebody once told me that down here in the South West you only get what he termed was a 'pseudo-winter'. I have a tendency to agree. Even though I call December a winter month the sea is still so warm that days with a maximum below 10C are not common until January. Another person said that there is always a touch of spring in a Devon winter, and I think that is the best way to describe the months of December, January & February. The trees may be without leaves from mid-December onwards but you will still find a Herb Robert and primroses flowering in the woods and hedgerows in January.

Spring (mid-February - mid-May): Spring comes early to the Otter Valley and by mid-February nature seems be getting prepared. The dawn chorus is becoming very noticeable now, as is the lengthening of the day. Wild daffodils, 3-cornered Leeks and snowdrops will be in flower before the end of February and by mid-March the hawthorn and willow will be coming into leaf. By April the Devon Bank hedgerows are bursting into life with a mass of wildflowers and the fields turn yellow with buttercups and dandelions. At the end of April most of the trees will be in full leaf though the ash is always a late starter.

Summer (mid-May - mid-September): By mid-May the countryside has taken on its summer look with all the trees now in full, dark green leaf and will stay that way until well into the autumn.

Autumn (mid-September - November): Autumn feels like the shortest season, but due to the warmth of the sea it can stay surprisingly warm and October often produces summer-like days down on the beach. Frosts are not common and in many years don't appear until after Xmas.


Temperature:

The weather station is situated about 6 miles from the coast on the relatively wide-open valley floor of the River Otter which is in south east Devon. The climate here is strongly influenced by the sea preventing extremes of temperature. During July 2006 whilst the Midlands and south east England baked in temperatures approaching 38°C (~100°F) the thermometer here reached a maximum of 30.8°C. This was due to a sea breeze that regularly reaches here by mid-late morning. It seems that 30°C is about the limit one could expect even on the hottest of days but despite this, the humidity remains high and the climate can be described as quite 'damp' which during hot weather can make it feel decidedly muggy and sticky.

In the winter time cold weather is again tempered by the sea preventing any really severe frosts. The coldest temperature so far recorded has been -4.5°C and that was quite exceptional. Generally frosts are slight (-0.1°C to -1.5°C) and reasonably infrequent and only occur in extremely calm conditions under a very clear sky when katabatic cooling leads to cold air settling on the valley floor. Some of the higher ground around here probably only gets a frost in exceptional circumstances.


Figure 1. Temperature and rainfall for the Otter Valley (2005 - 2009)

Precipitation:

There is a definite drying out of the weather from May through to September with July being the driest and sunniest month. It has been so dry during the last few summers (2007 & 2008 were exceptional as these summers were very wet) that drought conditions prevail causing the grass to go brown all summer long. This is in direct contrast to the winters which can be so wet that everything remains sopping and rarely has the chance to dry out. Maximum rainfall occurs during December & January with a distinct drying trend in precipitation from early March onwards. Total rainfall for the whole year is around 800-900 mm.

Snow:

A winter can pass and not one flake of snow will fall, but more often snow will be seen falling on one or two occasions through the winter but it rarely settles here. The hills on either side of the valley sometimes get a dusting but even here, the snow will melt quite quickly and will be gone within a day.

Sunshine:

Being situated near the south coast the Otter Valley has a very sunny climate when compared to the national average. Yearly sunshine levels for the last few years have been approaching 2000 hours. This high level of sunshine occurs mainly on hot, summer days when the wind is from a southerly direction. It is under these conditions that the sun shines all day long through a clear blue sky yet just a few more miles inland cumulus cloud builds from mid-morning onwards turning unbroken sunshine into sunny spells. Not surprisingly December has the least sunshine but you can still expect around 2-3 hours of bright sunshine daily with totals for the month ranging from 60 - 90 hours. Sunshine levels reach their peak during June & July with both these months getting around 230 to 260 hours each.


Figure 2. Average daily sunshine and mean pressure in the Otter Valley.

Wind:

Being on a relatively wide-open valley floor the wind can be quite a feature, especially when blowing from a southerly direction. Winds from other directions have hills to deal with so we are quite sheltered to the west (Dartmoor), north (Blackdown Hills) and east (Fire Beacon).


Figure 3. Wind direction in the Otter Valley

 

Fog:

In view of the valley location and dampness of the climate you would have thought that fog would be more common but I have found that this is not the case and fog is quite rare here. Rather a different story to the nearby Exe Valley where fogs are common.

On the whole the climate of the Otter Valley can be described as cool to warm; wet in the winter and dry in the summer; sunny, especially in the spring and summer; and coupled with some beautiful scenery and beaches, a fantastic place to live.

 

 

 

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