Skip to content
Surfhog home
Menu

M2 wave buoy daily means for Dec 2018

Daily means from the M2 wave buoy for Dec 2018, 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. Mean peak wave period was 6.5 seconds (10th–90th percentile 4–9.1 seconds); wave-height data were unavailable. Typical wind was 19.4 mph (10th–90th percentile 9.8–30.8 mph). All 2,968 checked values passed quality control.

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

Typical Significant Wave Height

-ft
Mean: - ft
P10–P90: - — - ft

Available for 0 of 742 hourly samples

Mean Observed Wave Period

6.5secs
P10–P90: 4 — 9.1secs
Recorded extremes

3 — 13.7secs

Typical Observed Wind

SW, 19.4mph
Mean: 19.7 mph
P10–P90: 9.8 — 30.8 mph
Recorded extremes

0.9 — 43 mph

Circular concentration: 62%

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 742 hourly samples

Compared With Previous Decembers

Historical baseline from 4,933 observations across 8 years.

Wave Height
–
Not enough comparable data
Historical mean 5.774ft
Wave Period
6.5s
0.4s above mean
Historical mean 6.1s
Water Temperature
–
Not enough comparable data
Historical mean 11.5°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 2018Last observation shown
Metric
Mean significant wave height (ft)-------------------------------
Mean maximum wave height (ft)-------------------------------
Mean peak period (s)686756665557879761010686665587654
Mean zero-crossing period (s)-------------------------------
Mean peak wave directionSconcentration 94%Sconcentration 96%Variableconcentration 25%Sconcentration 63%SSEconcentration 92%Sconcentration 98%SSWconcentration 86%SWconcentration 83%WNWconcentration 87%Wconcentration 79%Sconcentration 98%SSEconcentration 100%SEconcentration 90%SSEconcentration 96%SSEconcentration 100%Sconcentration 84%Sconcentration 87%SSEconcentration 100%Sconcentration 98%Sconcentration 95%Sconcentration 96%SWconcentration 81%ESEconcentration 54%SEconcentration 63%Sconcentration 98%Sconcentration 99%Sconcentration 99%Sconcentration 97%Sconcentration 97%Sconcentration 75%SWconcentration 80%
Mean wave direction-------------------------------
Mean directional spread (°)22.918.128.924.838.425.325.329.426.830.120.019.327.925.619.129.821.920.826.822.428.129.636.429.226.022.423.126.621.729.928.7
Mean wind directionSSWconcentration 70%SWconcentration 92%WNWconcentration 89%WSWconcentration 67%Variableconcentration 25%SSWconcentration 94%WSWconcentration 92%Wconcentration 94%WNWconcentration 97%WSWconcentration 69%Sconcentration 95%SSEconcentration 98%SEconcentration 98%SSEconcentration 100%SSEconcentration 76%SWconcentration 89%SSWconcentration 89%Sconcentration 93%SSWconcentration 98%WSWconcentration 96%SWconcentration 55%WSWconcentration 96%NEconcentration 72%SEconcentration 77%SSWconcentration 98%SSWconcentration 97%SWconcentration 96%SWconcentration 94%WSWconcentration 68%WSWconcentration 96%WSWconcentration 95%
Mean wind speed (mph)14191813151830282415222628273621252821221420131418181013151115
Mean water temperature(°C)-------------------------------

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