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M2 wave buoy daily means for Dec 2024

Daily means from the M2 wave buoy for Dec 2024, 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

715 wave-buoy observations covered all 31 days. Typical wave height was 4.2 ft (10th–90th percentile 1.9–9.6 ft), while mean peak wave period was 5.5 seconds (10th–90th percentile 3.4–8.3 seconds). Typical wind was 21.6 mph (10th–90th percentile 10.5–34.1 mph) and mean water temperature was 12.1°C (10th–90th percentile 11.4–13°C). All 4,290 checked values passed quality control. Across 14 comparable years, mean wave height was below the same-month mean of 5.6 ft and mean wave period was below the same-month mean of 6.1 seconds.

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

Typical Significant Wave Height

4.2ft
Mean: 5.2 ft
P10–P90: 1.9 — 9.6 ft
Recorded extremes

0.8 — 18.5 ft

Mean Observed Wave Period

5.5secs
P10–P90: 3.4 — 8.3secs
Recorded extremes

2.6 — 14.3secs

Typical Observed Wind

WSW, 21.6mph
Mean: 21.9 mph
P10–P90: 10.5 — 34.1 mph
Recorded extremes

1.7 — 52.8 mph

Circular concentration: 53%

Mean Water Temperature

12.1°C
P10–P90: 11.4 — 13°C
Recorded extremes

11.3 — 13.1°C

Compared With Previous Decembers

Historical baseline from 8,982 observations across 14 years.

Wave Height
5.2ft
0.4ft below mean
Historical mean 5.61ft
Wave Period
5.5s
0.6s below mean
Historical mean 6.1s
Water Temperature
12.1°C
0.4°C above mean
Historical mean 11.7°C

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 2024Last observation shown
Metric
Mean significant wave height (ft)563567QC rejected1163212444786579433322359
Mean maximum wave height (ft)8104910122317116423667121310711147465335914
Mean peak period (s)66558698654335456-6566445544468
Mean zero-crossing period (s)5544557654333444565455444444446
Mean peak wave directionSSWconcentration 83%NNWconcentration 78%Variableconcentration 26%SSWconcentration 56%SSWconcentration 66%Variableconcentration 26%Nconcentration 60%NNEconcentration 99%NEconcentration 97%NEconcentration 95%ENEconcentration 96%ENEconcentration 81%Nconcentration 60%NWconcentration 91%Wconcentration 94%SWconcentration 75%Sconcentration 98%SSWconcentration 98%NNWconcentration 84%WSWconcentration 65%Wconcentration 76%NWconcentration 92%Wconcentration 69%WSWconcentration 80%Sconcentration 99%Sconcentration 98%Sconcentration 96%SSWconcentration 76%Wconcentration 94%SSWconcentration 93%Sconcentration 99%
Mean wave directionSSWconcentration 89%NNWconcentration 82%Sconcentration 37%SSWconcentration 79%SWconcentration 75%WSWconcentration 40%Nconcentration 64%NNEconcentration 99%NEconcentration 97%NEconcentration 96%ENEconcentration 96%Econcentration 86%NNEconcentration 50%WNWconcentration 93%Wconcentration 98%SWconcentration 91%Sconcentration 96%SSWconcentration 92%NWconcentration 97%WSWconcentration 81%WSWconcentration 84%NWconcentration 93%WNWconcentration 61%WSWconcentration 86%Sconcentration 99%Sconcentration 99%Sconcentration 97%SSWconcentration 81%Wconcentration 97%SSWconcentration 96%SSWconcentration 98%
Mean directional spread (°)154.6146.6214.1181.9119.8168.9107.795.4109.2207.6203.0203.0214.5226.5234.0203.0135.8101.9144.8199.1153.8117.3200.5207.8194.9201.5191.5216.9214.3152.0103.1
Mean wind directionSSWconcentration 94%NWconcentration 95%WSWconcentration 78%SWconcentration 82%WSWconcentration 85%SWconcentration 73%NWconcentration 89%Nconcentration 97%NNEconcentration 98%ENEconcentration 98%ENEconcentration 95%SEconcentration 88%NWconcentration 36%Wconcentration 95%WSWconcentration 98%SWconcentration 95%Sconcentration 97%WSWconcentration 77%WNWconcentration 97%WSWconcentration 87%WSWconcentration 93%WNWconcentration 95%Wconcentration 86%SWconcentration 94%SSWconcentration 96%SSWconcentration 98%SSWconcentration 96%SWconcentration 91%WSWconcentration 98%SWconcentration 97%SWconcentration 95%
Mean wind speed (mph)2126132225274333231613912222221292427233135191516161210212131
Mean water temperature(°C)13.113.013.012.913.012.812.812.512.412.312.312.312.312.212.212.112.012.012.011.911.811.711.511.511.411.411.511.411.411.411.4

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