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M2 wave buoy daily means for Jun 2020

Daily means from the M2 wave buoy for Jun 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

720 wave-buoy observations covered all 30 days. Typical wave height was 2.3 ft (10th–90th percentile 0.8–6.2 ft), while mean peak wave period was 5.1 seconds (10th–90th percentile 3.3–6.6 seconds). Typical wind was 12.1 mph (10th–90th percentile 4.1–24.7 mph) and mean water temperature was 11.9°C (10th–90th percentile 10.6–13°C). All 2,877 checked values passed quality control. Across 8 comparable years, mean wave height was above the same-month mean of 2.6 ft and mean wave period was below the same-month mean of 5.2 seconds.

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

Typical Significant Wave Height

2.3ft
Mean: 3 ft
P10–P90: 0.8 — 6.2 ft
Recorded extremes

0.4 — 9.2 ft

Available for 240 of 720 hourly samples

Mean Observed Wave Period

5.1secs
P10–P90: 3.3 — 6.6secs
Recorded extremes

2.2 — 25secs

Available for 240 of 720 hourly samples

Typical Observed Wind

Variable, 12.1mph
Mean: 13.3 mph
P10–P90: 4.1 — 24.7 mph
Recorded extremes

0.5 — 36.8 mph

Circular concentration: 11%

Available for 719 of 720 hourly samples

Mean Water Temperature

11.9°C
P10–P90: 10.6 — 13°C
Recorded extremes

10.2 — 15.3°C

Available for 719 of 720 hourly samples

Compared With Previous Junes

Historical baseline from 5,077 observations across 8 years.

Wave Height
3ft
0.4ft above mean
Historical mean 2.625ft
Wave Period
5.1s
0.1s below mean
Historical mean 5.2s
Water Temperature
11.9°C
0.2°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 Jun 2020Last observation shown
Metric
Mean significant wave height (ft)114356321155321121235652123763
Mean maximum wave height (ft)10547105301884200213489722259104
Mean peak period (s)445556554666545446457766455655
Mean zero-crossing period (s)334445443355434333345554344554
Mean peak wave directionENEconcentration 64%Variableconcentration 15%NNEconcentration 97%NNWconcentration 70%NNWconcentration 94%NWconcentration 95%Nconcentration 93%Nconcentration 92%Variableconcentration 28%Variableconcentration 15%NEconcentration 93%NNEconcentration 99%NEconcentration 97%NNEconcentration 94%ESEconcentration 33%Sconcentration 34%NNEconcentration 73%Nconcentration 90%Variableconcentration 6%SSEconcentration 99%Sconcentration 99%Sconcentration 100%Sconcentration 99%SSEconcentration 86%Nconcentration 91%SSEconcentration 75%Sconcentration 88%SWconcentration 98%SWconcentration 97%SSWconcentration 80%
Mean wave directionENEconcentration 96%ESEconcentration 42%NNEconcentration 97%NNWconcentration 81%NNWconcentration 98%NWconcentration 95%Nconcentration 98%Nconcentration 88%ENEconcentration 43%SEconcentration 47%NEconcentration 96%NNEconcentration 100%NEconcentration 98%NEconcentration 98%ESEconcentration 58%Variableconcentration 17%NNEconcentration 95%NNEconcentration 91%Variableconcentration 22%SSEconcentration 99%Sconcentration 99%Sconcentration 100%Sconcentration 100%SSEconcentration 97%NNEconcentration 87%SSEconcentration 89%Sconcentration 91%SWconcentration 100%SWconcentration 99%SSWconcentration 89%
Mean directional spread (°)30.236.425.338.126.226.734.538.340.443.622.024.334.829.738.830.826.036.737.124.421.119.022.732.931.828.126.730.428.530.1
Mean wind directionENEconcentration 79%Variableconcentration 22%Nconcentration 97%NWconcentration 78%NWconcentration 98%NWconcentration 98%NNWconcentration 90%NWconcentration 64%Sconcentration 49%Variableconcentration 5%NEconcentration 95%NNEconcentration 98%NEconcentration 94%NEconcentration 81%SSWconcentration 41%NEconcentration 42%NNWconcentration 98%Nconcentration 92%Variableconcentration 28%Sconcentration 78%SSWconcentration 91%Sconcentration 97%Sconcentration 100%Variableconcentration 21%NNEconcentration 59%SSEconcentration 82%Sconcentration 67%WSWconcentration 99%WSWconcentration 99%SSWconcentration 79%
Mean wind speed (mph)861613212412949201912846971015162418971317262512
Mean water temperature(°C)12.513.111.410.410.510.510.711.011.211.010.910.911.211.712.612.712.412.312.212.012.312.312.213.013.512.712.412.612.712.9

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