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M2 wave buoy daily means for Mar 2020

Daily means from the M2 wave buoy for Mar 2020, 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

742 wave-buoy observations covered all 31 days. Typical wave height was 3.8 ft (10th–90th percentile 1.5–7.3 ft), while mean peak wave period was 5.6 seconds (10th–90th percentile 3.9–7.8 seconds). Typical wind was 18.5 mph (10th–90th percentile 9–26.7 mph) and mean water temperature was 8.2°C (10th–90th percentile 8–8.4°C). All 2,970 checked values passed quality control. Across 9 comparable years, mean wave height was above the same-month mean of 3.7 ft and mean wave period was above the same-month mean of 5.5 seconds.

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

Typical Significant Wave Height

3.8ft
Mean: 4.3 ft
P10–P90: 1.5 — 7.3 ft
Recorded extremes

0.8 — 12.3 ft

Available for 248 of 742 hourly samples

Mean Observed Wave Period

5.6secs
P10–P90: 3.9 — 7.8secs
Recorded extremes

2.5 — 10.8secs

Available for 248 of 742 hourly samples

Typical Observed Wind

Variable, 18.5mph
Mean: 18 mph
P10–P90: 9 — 26.7 mph
Recorded extremes

0.5 — 37 mph

Circular concentration: 21%

Mean Water Temperature

8.2°C
P10–P90: 8 — 8.4°C
Recorded extremes

7.9 — 8.6°C

Compared With Previous Marchs

Historical baseline from 6,341 observations across 9 years.

Wave Height
4.3ft
0.6ft above mean
Historical mean 3.707ft
Wave Period
5.6s
0.1s above mean
Historical mean 5.5s
Water Temperature
8.2°C
In line with the historical mean
Historical mean 8.2°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 Mar 2020Last observation shown
Metric
Mean significant wave height (ft)8452125675584554632463353225742
Mean maximum wave height (ft)1367222889771267769526844742361063
Mean peak period (s)7559755865766665775565454545654
Mean zero-crossing period (s)5444434555554454543454444444544
Mean peak wave directionSSWconcentration 94%SWconcentration 88%Wconcentration 82%SSEconcentration 88%SSEconcentration 68%SWconcentration 76%SSWconcentration 86%Sconcentration 93%SWconcentration 83%SWconcentration 88%Sconcentration 99%SWconcentration 93%SSWconcentration 55%Sconcentration 92%SWconcentration 49%WSWconcentration 62%Sconcentration 99%Sconcentration 84%Variableconcentration 13%NNEconcentration 90%ENEconcentration 100%Econcentration 87%SSEconcentration 80%Sconcentration 100%Sconcentration 99%Nconcentration 33%Nconcentration 99%NNEconcentration 93%NEconcentration 99%Nconcentration 99%NNEconcentration 97%
Mean wave directionSSWconcentration 99%SWconcentration 96%Wconcentration 89%Sconcentration 97%SEconcentration 81%SWconcentration 85%Sconcentration 96%SSWconcentration 99%SSWconcentration 88%SSWconcentration 97%Sconcentration 99%SWconcentration 95%SSWconcentration 73%Sconcentration 96%SWconcentration 69%SWconcentration 61%Sconcentration 100%SSWconcentration 97%NNWconcentration 50%NNEconcentration 90%Econcentration 99%ESEconcentration 94%SSEconcentration 85%Sconcentration 99%Sconcentration 100%NNEconcentration 32%Nconcentration 100%NNEconcentration 97%NNEconcentration 100%Nconcentration 100%NNEconcentration 97%
Mean directional spread (°)25.024.329.430.927.823.219.927.226.735.922.730.935.524.126.227.619.726.532.220.423.241.526.718.527.929.224.623.222.720.034.6
Mean wind directionWSWconcentration 99%WSWconcentration 98%Wconcentration 96%Variableconcentration 28%NNEconcentration 31%WSWconcentration 67%SSWconcentration 98%WSWconcentration 94%SWconcentration 83%WSWconcentration 97%SWconcentration 94%WSWconcentration 94%SWconcentration 54%SSWconcentration 91%Wconcentration 77%SWconcentration 80%SSWconcentration 88%Wconcentration 95%Nconcentration 95%NEconcentration 90%Econcentration 96%ESEconcentration 94%Sconcentration 97%Sconcentration 98%SSEconcentration 85%NNEconcentration 90%NNEconcentration 98%NEconcentration 99%NNEconcentration 96%Nconcentration 98%NNEconcentration 88%
Mean wind speed (mph)262120591325202619222817212021211012202012182213131321231911
Mean water temperature(°C)8.48.38.18.38.48.38.38.38.38.38.38.38.38.38.38.38.18.08.08.08.18.28.28.28.28.28.28.28.28.28.2

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