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Brittany wave buoy daily means for Jan 2021

Daily means from the Brittany wave buoy for Jan 2021, 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

725 wave-buoy observations covered all 31 days. Typical wave height was 9.2 ft (10th–90th percentile 6.2–14.7 ft), while mean reported wave period; measurement type unavailable was 6.9 seconds (10th–90th percentile 5–8 seconds). Typical wind was 20.8 mph (10th–90th percentile 10.3–27.7 mph). 1 of 2,900 checked values (0%) were excluded by quality control. Across 10 comparable years, mean wave height was below the same-month mean of 13.1 ft and mean wave period was below the same-month mean of 8 seconds.

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

Typical Wave Height

9.2ft
Mean: 10.3 ft
P10–P90: 6.2 — 14.7 ft
Recorded extremes

3.6 — 40.4 ft

Available for 724 of 725 hourly samples

Mean Wave Period

6.9secs
P10–P90: 5 — 8secs
Recorded extremes

4 — 13secs

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 725 hourly samples

Typical Wind

Variable, 20.8mph
Mean: 20.2 mph
P10–P90: 10.3 — 27.7 mph
Recorded extremes

2.2 — 39.1 mph

Circular concentration: 29%

Compared With Previous Januarys

Historical baseline from 6,747 observations across 10 years.

Wave Height
10.3ft
2.8ft below mean
Historical mean 13.1ft
Wave Period
6.9s
1.1s below mean
Historical mean 8s
Water Temperature
–
Not enough comparable data
Historical mean 12.3°C

Chart showing grouped wave observations for Brittany. 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 Brittany wave buoy

Brittany buoy (WMO 62163) is maintained jointly by the UK Met Office and Météo-France in the Bay of Biscay. Its exposed position west of Brittany monitors Atlantic conditions approaching western France and the western entrance to the English Channel. The international feed can include wind, pressure, temperature and wave observations when available.

Metrics are rows; days run left to right.
Brittany wave buoy daily means Jan 2021Last observation shown
Metric
Mean wave height (ft)1178897578759910810981115131414111071114132718
Mean observed period(s)7Reported6Reported6Reported6Reported6Reported6Reported5Reported5Reported6Reported6Reported7Reported7Reported6Reported7Reported7Reported7Reported9Reported6Reported7Reported8Reported8Reported8Reported8Reported7Reported8Reported6Reported8Reported8Reported8Reported10Reported9Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionNconcentration 98%Nconcentration 96%NNEconcentration 95%NEconcentration 99%NEconcentration 98%NEconcentration 97%NNEconcentration 93%NNEconcentration 97%NEconcentration 95%NEconcentration 70%WNWconcentration 96%Wconcentration 100%WSWconcentration 97%NWconcentration 84%SWconcentration 82%Wconcentration 32%Econcentration 37%SSWconcentration 95%SSWconcentration 99%SWconcentration 67%NNWconcentration 56%WNWconcentration 89%WNWconcentration 84%WNWconcentration 96%Variableconcentration 28%SWconcentration 84%SWconcentration 100%SWconcentration 98%SWconcentration 89%Wconcentration 85%Wconcentration 92%
Mean wind speed (mph)2420232324201522201113222018141992127241523162213202424243325
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.

Which wave period is shown?

The table shows the best period measurement supplied for each observation. It is not necessarily the energy period used to calculate wave power.

Tp
Peak period: the period at the strongest spectral peak.
Tavg
The provider's average wave period.
Tm02
A mean period calculated from the wave spectrum.
Tz
Mean zero-crossing period.
Reported
A legacy value whose period type was not recorded.
Mixed
A daily or monthly mean containing more than one period type.

Wave power needs a genuine energy period (Te). SurfHog does not substitute Tp, Tavg, Tm02 or Tz when Te is missing.

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 UK Met Office.

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