Skip to content
Surfhog home
Menu

Cap Ferret wave buoy daily means for Jul 2017

Daily means from the Cap Ferret wave buoy for Jul 2017, 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

1,488 wave-buoy observations covered all 31 days. Typical wave height was 4 ft (10th–90th percentile 2.4–6.8 ft), while mean peak wave period was 8.5 seconds (10th–90th percentile 5.8–10.6 seconds). Typical calculated wave power was approximately 5.2 kW/m (10th–90th percentile 1.5–18 kW/m), derived from significant wave height and energy period. 6 of 4,464 checked values (0.1%) were excluded by quality control. Across 6 comparable years, mean wave height was above the same-month mean of 4 ft and mean wave period was below the same-month mean of 8.7 seconds.

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

Typical Significant Wave Height

4ft
Mean: 4.4 ft
P10–P90: 2.4 — 6.8 ft
Recorded extremes

1.2 — 12.6 ft

Mean Observed Wave Period

8.5secs
P10–P90: 5.8 — 10.6secs
Recorded extremes

3.3 — 13.5secs

Available for 743 of 744 hourly samples

Typical Wave Power

Approximately 5.23kW/m
Mean: 7.92kW/m
P10–P90: 1.48 — 18.02kW/m
Recorded extremes

0.4 — 60.67kW/m

Calculated from significant wave height and energy period.

Typical Observed Wind

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

Available for 0 of 744 hourly samples

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 744 hourly samples

Compared With Previous Julys

Historical baseline from 7,552 observations across 6 years.

Wave Height
4.4ft
0.4ft above mean
Historical mean 4.003ft
Wave Period
8.5s
0.2s below mean
Historical mean 8.7s
Water Temperature
–
Not enough comparable data

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 Jul 2017Last observation shown
Metric
Mean significant wave height (ft)QC rejected432222344455433334567765346764
Mean maximum wave height (ft)167543434765876554568911101085781197
Mean peak period (s)9799867571098109789119810101077681112109
Mean average period (s)868765556787875679779986657101198
Mean period Tm02 (s)7565444445657544566676655457976
Mean peak wave directionNWconcentration 100%WNWconcentration 99%WNWconcentration 100%WNWconcentration 100%WNWconcentration 85%Wconcentration 96%NWconcentration 91%NWconcentration 93%WNWconcentration 99%WNWconcentration 99%WNWconcentration 100%WNWconcentration 100%WNWconcentration 100%WNWconcentration 100%NWconcentration 96%NWconcentration 97%NWconcentration 100%WNWconcentration 100%WNWconcentration 98%WNWconcentration 100%WNWconcentration 100%WNWconcentration 100%WNWconcentration 100%WNWconcentration 99%WNWconcentration 100%WNWconcentration 100%WNWconcentration 100%WNWconcentration 100%WNWconcentration 100%WNWconcentration 100%WNWconcentration 100%
Mean directional spread (°)18.822.416.219.724.819.926.426.328.920.920.319.416.719.021.520.618.117.119.419.018.217.519.825.826.424.519.714.912.417.620.7
Mean water temperature(°C)-------------------------------

Swipe sideways to see more days.

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.

› Wave Buoy List