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M2 wave buoy daily means for Dec 2004

Daily means from the M2 wave buoy for Dec 2004, 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

672 wave-buoy observations covered all 31 days. Typical wave height was 4.6 ft (10th–90th percentile 2.6–7.9 ft), while mean zero-crossing wave period was 4.9 seconds (10th–90th percentile 4–6 seconds). Typical wind was 21.9 mph (10th–90th percentile 11.9–32.2 mph) and mean water temperature was 11.8°C (10th–90th percentile 10.8–12.4°C). 1 of 3,124 checked values (0%) were excluded by quality control.

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

Typical Significant Wave Height

4.6ft
Mean: 5 ft
P10–P90: 2.6 — 7.9 ft
Recorded extremes

1.6 — 11.8 ft

Available for 624 of 672 hourly samples

Mean Observed Wave Period

4.9secs
P10–P90: 4 — 6secs
Recorded extremes

4 — 8secs

Available for 628 of 672 hourly samples

Typical Observed Wind

WSW, 21.9mph
Mean: 22 mph
P10–P90: 11.9 — 32.2 mph
Recorded extremes

2.3 — 41.4 mph

Circular concentration: 61%

Available for 604 of 672 hourly samples

Mean Water Temperature

11.8°C
P10–P90: 10.8 — 12.4°C
Recorded extremes

10.6 — 12.5°C

Available for 636 of 672 hourly samples

Chart showing grouped wave observations for M2. 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 M2 wave buoy

M2 (WMO 62091) is part of the Irish Marine Data Buoy Observation Network, managed by the Marine Institute in collaboration with Met Éireann. Moored in the Irish Sea east of Ireland, it provides open-water context for the busy, relatively enclosed waters between the Irish and British coasts.

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

Metrics are rows; days run left to right.
M2 wave buoy daily means Dec 2004Last observation shown
Metric
Mean significant wave height (ft)3333362465334848656656877757554
Mean maximum wave height (ft)-------------------------------
Mean peak period (s)-------------------------------
Mean zero-crossing period (s)5444454555545656555555555555555
Mean peak wave direction-------------------------------
Mean wave direction-------------------------------
Mean directional spread (°)-------------------------------
Mean wind directionVariableconcentration 14%NNWconcentration 85%WSWconcentration 99%SWconcentration 97%WSWconcentration 90%SWconcentration 88%SWconcentration 55%SSWconcentration 99%Sconcentration 100%SSWconcentration 57%Sconcentration 85%Sconcentration 97%Sconcentration 97%SSWconcentration 100%WSWconcentration 61%WSWconcentration 91%Wconcentration 94%Variableconcentration 28%ESEconcentration 79%WSWconcentration 83%WNWconcentration 71%WSWconcentration 98%WSWconcentration 99%WSWconcentration 91%WNWconcentration 94%NWconcentration 98%SWconcentration 87%Wconcentration 99%WSWconcentration 90%SSWconcentration 98%Wconcentration 67%
Mean wind speed (mph)11151919172411232518151420311834292121262226302829272331212118
Mean water temperature(°C)12.412.412.412.412.312.212.312.312.212.212.212.112.112.112.112.011.811.711.711.611.611.611.411.211.111.010.910.910.710.710.7

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 Met Éireann Irish Marine Data Buoy Observation Network.

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

› Wave Buoy List