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Cap Ferret wave buoy daily means for Dec 2001

Daily means from the Cap Ferret wave buoy for Dec 2001, including available wave height, period, direction, wind and sea temperature data.

Last observation shown

Data available:  to 

Monthly means for

Latest

Period Summary

Programmatically generated summary. Hog Says

738 wave-buoy observations covered all 31 days. Typical wave height was 3.4 ft (10th–90th percentile 1.9–9.3 ft), while mean average of more than one wave period type was 10.3 seconds (10th–90th percentile 4.4–14.7 seconds). Typical calculated wave power was approximately 3.9 kW/m (10th–90th percentile 0.9–36.7 kW/m), derived from significant wave height and energy period. 12 of 2,206 checked values (0.5%) were excluded by quality control.

Generated only from the observations and comparisons shown on this page.

Typical Significant Wave Height

3.4ft
Mean: 4.7 ft
P10–P90: 1.9 — 9.3 ft
Recorded extremes

1.2 — 14.1 ft

Available for 734 of 738 hourly samples

Mean Observed Wave Period

10.3secs
P10–P90: 4.4 — 14.7secs
Recorded extremes

2.4 — 20.9secs

Available for 722 of 738 hourly samples

Typical Wave Power

Approximately 3.93kW/m
Mean: 12.27kW/m
P10–P90: 0.89 — 36.67kW/m
Recorded extremes

0.28 — 83.01kW/m

Calculated from significant wave height and energy period.

Available for 726 of 738 hourly samples with wave power

Typical Observed Wind

-, -mph
Mean: - mph
P10–P90: - — - mph

Available for 0 of 738 hourly samples

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 738 hourly samples

Chart showing grouped wave observations for Cap Ferret. Use the table on this page for a text version of the same measurements. To open hourly observations, use a linked day name in the table.

About Cap Ferret wave buoy

Cap Ferret is a long-running CANDHIS directional buoy off the Aquitaine coast, operated within France's national in-situ sea-state observatory. It provides an offshore reference for the energetic Bay of Biscay swell approaching the Arcachon inlet and the long, sandy and erosion-prone Landes coastline.

Its current data source reports wave height, wave period, wave direction, directional spread and sea temperature.

Metrics are rows; days run left to right.
Cap Ferret wave buoy daily means Dec 2001Last observation shown
Metric
Mean significant wave height (ft)106681075332234QC rejected332222234248691283
Mean maximum wave height (ft)15101012151175543458544334256361291319125
Mean peak period (s)121213121412111113107516151416125341267141199910109
Mean average period (s)1011111011109895457887443474597878996
Mean period Tm02 (s)8987886564345665443454465666774
Mean peak wave directionNconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%
Mean directional spread (°)0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Mean water temperature(°C)-------------------------------

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Wave metric colour key

Colours move through the scale as each number increases. They do not by themselves mean that conditions are good, safe or suitable for you.

Wave & swell height0–40+ ft
Wave & swell period0–22+ s
Wind speed0–75 mph

The displayed numbers remain the source of truth; colour is an additional visual cue.

What does buoy wave power mean?

kW/m means kilowatts of wave power per metre of wave crest. It describes the rate at which the observed sea state carries energy past the buoy.

Unlike the shore-directed forecast value, buoy wave power is the total power at the observation point. It is not projected towards a particular beach and does not predict breaking wave height.

In deep water, wave power can be calculated with:

P is approximately 0.49 times significant wave height squared times wave energy period.

P is power in kW/m, Hs is significant wave height in metres, and Te is wave energy period in seconds.

  • Provider-reported power is used when available.
  • Otherwise, a value is calculated only when both significant height and a genuine energy period are available. The ≈ symbol marks calculated values.
  • A dash is shown instead of substituting peak, Tm02, zero-crossing or other period measurements.
  • Daily and monthly figures use the mean of hourly-normalized observation power values; they are not calculated from mean height and period.

Wave direction, spectrum, water depth and local bathymetry still matter. Wave power is best read alongside height, period and direction rather than as a standalone surf-quality score.

The observation data displayed on this page is from the Cerema CANDHIS coastal wave observatory.

Learn how SurfHog combines, checks and summarizes observations in the data and methodology notes.

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