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M2 wave buoy daily means for Jan 2020

Daily means from the M2 wave buoy for Jan 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

744 wave-buoy observations covered all 31 days. Typical wave height was 4.6 ft (10th–90th percentile 1.5–9.2 ft), while mean peak wave period was 6.5 seconds (10th–90th percentile 3.5–9.9 seconds). Typical wind was 20.2 mph (10th–90th percentile 8.8–30.5 mph) and mean water temperature was 10°C (10th–90th percentile 9.5–10.5°C). All 2,976 checked values passed quality control. Across 9 comparable years, mean wave height was below the same-month mean of 5.2 ft and mean wave period was above the same-month mean of 5.7 seconds.

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

Typical Significant Wave Height

4.6ft
Mean: 5.1 ft
P10–P90: 1.5 — 9.2 ft
Recorded extremes

0.4 — 15.4 ft

Available for 248 of 744 hourly samples

Mean Observed Wave Period

6.5secs
P10–P90: 3.5 — 9.9secs
Recorded extremes

2.3 — 13.8secs

Available for 248 of 744 hourly samples

Typical Observed Wind

SW, 20.2mph
Mean: 19.8 mph
P10–P90: 8.8 — 30.5 mph
Recorded extremes

0.3 — 45.5 mph

Circular concentration: 72%

Mean Water Temperature

10°C
P10–P90: 9.5 — 10.5°C
Recorded extremes

9.3 — 10.7°C

Compared With Previous Januarys

Historical baseline from 5,880 observations across 9 years.

Wave Height
5.1ft
0.1ft below mean
Historical mean 5.217ft
Wave Period
6.5s
0.8s above mean
Historical mean 5.7s
Water Temperature
10°C
0.2°C above mean
Historical mean 9.8°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 Jan 2020Last observation shown
Metric
Mean significant wave height (ft)39545984551049789542221124556556
Mean maximum wave height (ft)313768141266715614101113753321025888879
Mean peak period (s)475468876798891081096535635665567
Mean zero-crossing period (s)4644565554656666544433434555445
Mean peak wave directionSEconcentration 72%Sconcentration 99%WNWconcentration 75%SWconcentration 87%Sconcentration 99%Sconcentration 100%Sconcentration 100%Sconcentration 98%Econcentration 44%SWconcentration 53%Sconcentration 99%SSWconcentration 80%Sconcentration 98%Sconcentration 100%Sconcentration 96%Sconcentration 99%Sconcentration 90%SSWconcentration 73%SSWconcentration 58%Sconcentration 88%Wconcentration 98%WSWconcentration 52%Variableconcentration 28%Wconcentration 86%Sconcentration 99%Sconcentration 99%Sconcentration 99%WSWconcentration 94%SWconcentration 84%Sconcentration 81%Sconcentration 100%
Mean wave directionSconcentration 98%Sconcentration 100%WNWconcentration 71%SWconcentration 92%Sconcentration 100%Sconcentration 99%Sconcentration 100%SSWconcentration 98%NEconcentration 64%SWconcentration 62%Sconcentration 100%SSWconcentration 92%Sconcentration 100%Sconcentration 99%Sconcentration 100%Sconcentration 100%SSWconcentration 91%WSWconcentration 91%WSWconcentration 41%SSWconcentration 95%WSWconcentration 98%SWconcentration 58%SSEconcentration 80%WSWconcentration 86%Sconcentration 100%SSWconcentration 98%Sconcentration 100%WSWconcentration 97%SWconcentration 91%SSWconcentration 91%Sconcentration 99%
Mean directional spread (°)34.617.229.021.319.218.119.224.825.325.818.623.219.023.226.720.427.227.231.329.228.538.136.723.921.324.321.427.924.823.717.9
Mean wind directionSSWconcentration 92%SSWconcentration 98%WNWconcentration 90%WSWconcentration 91%SSWconcentration 99%SWconcentration 83%SSWconcentration 96%WSWconcentration 73%Nconcentration 82%WSWconcentration 74%SSWconcentration 96%WSWconcentration 90%SSWconcentration 95%SWconcentration 93%SWconcentration 99%Sconcentration 91%Wconcentration 95%WNWconcentration 98%WSWconcentration 70%WSWconcentration 90%Wconcentration 97%NNWconcentration 53%SWconcentration 49%WSWconcentration 88%SSWconcentration 98%SWconcentration 81%SWconcentration 94%Wconcentration 98%WSWconcentration 90%SWconcentration 91%SSWconcentration 100%
Mean wind speed (mph)153021202327281517232817312225261815121013631119212227232223
Mean water temperature(°C)10.710.610.610.510.510.310.310.410.410.410.310.210.210.110.010.010.09.89.99.89.79.79.69.69.69.69.69.59.49.59.5

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