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M2 wave buoy daily means for Jan 2021

Daily means from the M2 wave buoy for Jan 2021, 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

730 wave-buoy observations covered all 31 days. Typical wave height was 4.1 ft (10th–90th percentile 2.1–6.7 ft), while mean peak wave period was 5.6 seconds (10th–90th percentile 3.8–8.2 seconds). Typical wind was 18.8 mph (10th–90th percentile 10–24.6 mph) and mean water temperature was 9.6°C (10th–90th percentile 9–10.3°C). 12 of 4,380 checked values (0.3%) were excluded by quality control. Across 10 comparable years, mean wave height was below the same-month mean of 5.2 ft and mean wave period was below the same-month mean of 5.7 seconds.

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

Typical Significant Wave Height

4.1ft
Mean: 4.4 ft
P10–P90: 2.1 — 6.7 ft
Recorded extremes

1 — 14.4 ft

Mean Observed Wave Period

5.6secs
P10–P90: 3.8 — 8.2secs
Recorded extremes

2.8 — 15.1secs

Available for 718 of 730 hourly samples

Typical Observed Wind

Variable, 18.8mph
Mean: 18.2 mph
P10–P90: 10 — 24.6 mph
Recorded extremes

0.7 — 37.7 mph

Circular concentration: 23%

Mean Water Temperature

9.6°C
P10–P90: 9 — 10.3°C
Recorded extremes

8.8 — 10.6°C

Compared With Previous Januarys

Historical baseline from 6,624 observations across 10 years.

Wave Height
4.4ft
0.8ft below mean
Historical mean 5.184ft
Wave Period
5.6s
0.1s below mean
Historical mean 5.7s
Water Temperature
9.6°C
0.3°C below mean
Historical mean 9.9°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 2021Last observation shown
Metric
Mean significant wave height (ft)55565336235324474355643335243107
Mean maximum wave height (ft)7789844834643661064778554573551410
Mean peak period (s)6566654644555566447984454685877
Mean zero-crossing period (s)5455443534444445445554444454565
Mean peak wave directionNNEconcentration 98%Nconcentration 91%NEconcentration 97%NEconcentration 98%NEconcentration 96%NEconcentration 93%WNWconcentration 89%Nconcentration 96%NNWconcentration 46%Wconcentration 97%SWconcentration 89%ESEconcentration 34%Sconcentration 91%NWconcentration 57%SEconcentration 56%SWconcentration 57%Wconcentration 96%SSWconcentration 87%Sconcentration 100%Sconcentration 83%SWconcentration 62%Wconcentration 87%WNWconcentration 75%SEconcentration 54%Wconcentration 87%Sconcentration 99%Sconcentration 99%SSEconcentration 90%Sconcentration 83%ENEconcentration 98%ESEconcentration 79%
Mean wave directionNNEconcentration 98%Nconcentration 91%NEconcentration 98%NEconcentration 99%NEconcentration 99%NEconcentration 95%WNWconcentration 92%Nconcentration 95%NNWconcentration 41%Wconcentration 98%SWconcentration 94%SEconcentration 50%Sconcentration 96%NWconcentration 60%SEconcentration 62%SWconcentration 71%Wconcentration 95%SSWconcentration 91%Sconcentration 100%Sconcentration 76%WSWconcentration 93%Wconcentration 98%NWconcentration 89%SEconcentration 62%Wconcentration 83%Sconcentration 99%Sconcentration 99%SSEconcentration 94%Sconcentration 90%Econcentration 98%ESEconcentration 90%
Mean directional spread (°)26.225.728.227.526.334.725.826.634.323.527.336.227.828.531.227.325.927.021.323.428.428.029.128.426.721.226.733.927.023.132.6
Mean wind directionNNEconcentration 98%NNWconcentration 89%NEconcentration 97%NEconcentration 99%NEconcentration 99%NNEconcentration 93%NWconcentration 90%NNEconcentration 93%WNWconcentration 65%Wconcentration 99%WSWconcentration 99%NEconcentration 39%SWconcentration 92%NWconcentration 79%SEconcentration 57%Wconcentration 81%Wconcentration 97%SWconcentration 91%SSWconcentration 99%NWconcentration 68%Wconcentration 96%Wconcentration 98%WNWconcentration 79%Econcentration 46%Wconcentration 90%SSWconcentration 89%Sconcentration 47%SSWconcentration 88%WNWconcentration 33%Econcentration 99%ESEconcentration 96%
Mean wind speed (mph)2020212221121821131923111319182521181815231817151717915153119
Mean water temperature(°C)10.610.510.410.310.210.09.99.89.89.79.69.69.69.69.69.59.59.59.49.49.39.29.19.19.19.09.09.09.09.19.0

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