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M4 wave buoy monthly means for 2023

Monthly means from the M4 wave buoy for 2023, including available wave height, period, direction, wind and sea temperature data.

Last observation shown none

Data available:  to 

Latest

Period Summary

Programmatically generated summary. Hog Says

No wave-buoy observations were recorded for this period, so no wave statistics are available.

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

Typical Wave Height

-ft
Mean: - ft
P10–P90: - — - ft

Mean Wave Period

-secs
P10–P90: - — -secs

Mean Water Temperature

-°C
P10–P90: - — -°C

Typical Wind

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

Chart showing grouped wave observations for M4. Use the table on this page for a text version of the same measurements. To open daily observations, use a linked month name in the table.

About M4 wave buoy

M4 is an offshore data buoy in the Atlantic approaches (55.0000°N, 10.0000°W). It supports marine forecasting by providing real‑time sea‑state and weather observations in open water. It typically reports directional waves and meteorology.

Metrics are rows; months run left to right.
M4 wave buoy monthly means 2023Last observation shown unknown
Metric
Mean wave height (ft)------------
Mean observed period(s)------------
Mean wave power(kW/m)------------
Mean wind direction------------
Mean wind speed (mph)------------
Mean water temperature(°C)------------

Swipe sideways to see more months.

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.

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