Skip to content
Surfhog home
Menu

M2 wave buoy daily means for Dec 2015

Daily means from the M2 wave buoy for Dec 2015, 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 7.2 ft (10th–90th percentile 3.8–12.4 ft), while mean peak wave period was 7.9 seconds (10th–90th percentile 5.2–10.7 seconds). Typical wind was 24.6 mph (10th–90th percentile 14.1–34.9 mph) and mean water temperature was 11.9°C (10th–90th percentile 11.6–12.2°C). 6 of 4,464 checked values (0.1%) were excluded by quality control. Across 5 comparable years, mean wave height was above the same-month mean of 5.6 ft and mean wave period was above the same-month mean of 5.9 seconds.

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

Typical Significant Wave Height

7.2ft
Mean: 7.8 ft
P10–P90: 3.8 — 12.4 ft
Recorded extremes

1.9 — 20.2 ft

Mean Observed Wave Period

7.9secs
P10–P90: 5.2 — 10.7secs
Recorded extremes

2.9 — 17.7secs

Available for 738 of 744 hourly samples

Typical Observed Wind

SSW, 24.6mph
Mean: 24.4 mph
P10–P90: 14.1 — 34.9 mph
Recorded extremes

0.8 — 44.1 mph

Circular concentration: 69%

Mean Water Temperature

11.9°C
P10–P90: 11.6 — 12.2°C
Recorded extremes

11.2 — 12.5°C

Compared With Previous Decembers

Historical baseline from 3,200 observations across 5 years.

Wave Height
7.8ft
2.2ft above mean
Historical mean 5.643ft
Wave Period
7.9s
2s above mean
Historical mean 5.9s
Water Temperature
11.9°C
0.3°C above mean
Historical mean 11.6°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 2015Last observation shown
Metric
Mean significant wave height (ft)6848QC rejected889117653457879889911675910158
Mean maximum wave height (ft)91161222111114161088568101111141211141417811713152011
Mean peak period (s)7877997898565699778979787101089119
Mean zero-crossing period (s)5655765665554456556656665666676
Mean peak wave directionSconcentration 99%Sconcentration 100%SSEconcentration 37%Sconcentration 90%Sconcentration 100%Sconcentration 100%Sconcentration 94%Sconcentration 91%Sconcentration 100%Sconcentration 98%SWconcentration 94%Variableconcentration 28%Econcentration 71%Sconcentration 99%SSEconcentration 89%Sconcentration 99%Sconcentration 100%Sconcentration 100%Sconcentration 100%Sconcentration 100%Sconcentration 99%Sconcentration 100%Sconcentration 97%Sconcentration 94%SSEconcentration 83%Sconcentration 100%Sconcentration 99%SSEconcentration 99%Sconcentration 100%Sconcentration 100%Sconcentration 93%
Mean wave directionSconcentration 99%Sconcentration 100%SSEconcentration 38%SSWconcentration 92%Sconcentration 100%Sconcentration 99%Sconcentration 98%SSWconcentration 96%Sconcentration 100%SSWconcentration 99%SWconcentration 99%SEconcentration 45%ESEconcentration 86%SSEconcentration 99%SSEconcentration 96%Sconcentration 99%Sconcentration 100%Sconcentration 100%Sconcentration 100%Sconcentration 100%Sconcentration 98%Sconcentration 100%Sconcentration 99%SSWconcentration 98%Sconcentration 88%Sconcentration 99%Sconcentration 99%SSEconcentration 99%Sconcentration 100%Sconcentration 100%SSWconcentration 96%
Mean directional spread (°)18.917.627.916.514.820.721.419.716.320.825.929.931.223.127.721.218.318.816.320.219.117.619.021.022.417.522.722.920.821.122.0
Mean wind directionSSWconcentration 95%WSWconcentration 72%NNWconcentration 33%SWconcentration 95%SSWconcentration 99%Wconcentration 38%SSEconcentration 94%SWconcentration 87%SSWconcentration 99%WSWconcentration 96%Wconcentration 98%Variableconcentration 18%ESEconcentration 65%SEconcentration 89%SEconcentration 97%SSWconcentration 86%SSWconcentration 97%SSWconcentration 98%SSWconcentration 98%SWconcentration 97%SWconcentration 92%SWconcentration 95%SWconcentration 91%SWconcentration 95%SSWconcentration 59%SWconcentration 81%SSWconcentration 81%SSEconcentration 97%SSWconcentration 96%Sconcentration 77%SWconcentration 74%
Mean wind speed (mph)22211528371827273324241815182121262629262628313018191730312924
Mean water temperature(°C)12.212.212.012.011.911.912.012.312.212.011.611.411.612.012.112.112.112.112.112.012.011.911.811.811.711.711.711.711.711.711.6

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