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The Beaufort Wind Scale

Description Force Speed (Knots) Sea
Light Airs 1 1-3 Ripples
Light Breeze 2 4-6 Small Wavelets
Gentle Breeze 3 7-10 Occasional Crests
Moderate 4 11-16 Frequent White Horses
Fresh Breeze 5 17-21 Moderate Waves, Many White Crests
Strong Breeze 6 22-27 Large Waves, White Foam Crests
Near Gale 7 28-33 Sea heaps up, spray, breaking waves, foam blows in streaks
Gale 8 34-40 Moderately high waves, breaking crests
Severe Gale 9 41-47 High waves, spray affects visibility
Storm 10 48-55 Very high waves, long breaking crests
Violent Storm 11 56-63 Exceptionally high seas with continuously breaking waves affecting visibility
Hurricane 12 64 and above Exceptionally high seas, with continously breaking waves seriously affecting visibility

The weather is a key element to the operation of a boat. This page details some useful information about the weather you can expect during the year. The figures given below are from a variety of sources.

Air Temperature

Probably the measure that most directly influences us. Below is the average temperatures that we can expect, as well as typical high and low values that are likely to be experienced.

 C Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Avg 5 5 7 8 12 15 17 17 15 12 8 6
Low 2 3 4 5 8 11 14 13 11 9 5 3
High 7 7 10 12 16 18 21 20 18 15 11 8

Sea Temperature

For diving the key to the comfort during the dive is the sea temperature.  June – October are the months of the warmest water, but often the warm water brings the algae that spoils the visibility. The dive season often starts at Easter. This is when the water is just starting to warm but the water is clear.

 C Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Sea 9 8 8 9 11 14 16 17 17 15 13 11

Sun

The hours of sunshine on a daily during the day is not surprisingly May-Jul when the days are the longest.

 Hrs Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Sunshine 4 5 6 9 10 11 10 8 8 6 4 4

Wind Speed

The wind is the crucial aspect of the weather for the comfort at sea. The average wind speed is consistent over the year. However, this does not reflect the gales and doldrums we experience in the English Channel

 Kts Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Wind 11 10 10 10 10 9 10 9 10 10 10 10

Rainfall

Rainfall is the opposite to the sun in contributing how we feel about the days weather. Listed below is the average rainfall in mm we can expect each month.

 mm Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Rain 79 65 46 51 37 55 45 37 51 78 64 70

Humidity

Not surprisingly the Relative Humidity is fairly constant thanks to the sea.

 % Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
RH 87 84 81 79 79 80 80 78 80 82 85 87
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