M2 wave buoy daily means for Apr 2021

Daily means from the M2 wave buoy for Apr 2021, including available wave height, period, direction, wind and sea temperature data.

Last observation shown Fri, Apr 30, 2021, 23:00

Data available: Thu, May 3, 2001 to Sat, Aug 22, 2026

Monthly means for 2021

Period Summary

Hog Says

704 wave-buoy observations covered all 30 days. Typical wave height was 1.5 ft (10th–90th percentile 1–5.1 ft), while mean peak wave period was 4.6 seconds (10th–90th percentile 3–6.2 seconds). Typical wind was 11.1 mph (10th–90th percentile 4.7–21 mph) and mean water temperature was 8.8°C (10th–90th percentile 8.3–9.5°C). 5 of 4,224 checked values (0.1%) were excluded by quality control. Across 9 comparable years, mean wave height was below the same-month mean of 3.1 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

1.5ft

Mean: 2.3 ft

P10–P90: 1 — 5.1 ft

Recorded extremes

0 — 7.7 ft

Mean Observed Wave Period

4.6secs

P10–P90: 3 — 6.2secs

Recorded extremes

2 — 9.7secs

Available for 699 of 704 hourly samples

Typical Observed Wind

Variable, 11.1mph

Mean: 12 mph

P10–P90: 4.7 — 21 mph

Recorded extremes

0.2 — 27.8 mph

Circular concentration: 24%

Mean Water Temperature

8.8°C

P10–P90: 8.3 — 9.5°C

Recorded extremes

8.1 — 10.7°C

Compared With Previous Aprils

Historical baseline from 6,428 observations across 9 years.

Wave Height: 2.3ft; 0.8ft below mean; Historical mean 3.051ft
Wave Period: 4.6s; 0.6s below mean; Historical mean 5.2s
Water Temperature: 8.8°C; 0.2°C above mean; Historical mean 8.6°C

Show 10th–90th percentile ranges

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.

M2 wave buoy daily means Apr 2021Last observation shown Apr 2021
Metric	Apr 1	Apr 2	Apr 3	Apr 4	Apr 5	Apr 6	Apr 7	Apr 8	Apr 9	Apr 10	Apr 11	Apr 12	Apr 13	Apr 14	Apr 15	Apr 16	Apr 17	Apr 18	Apr 19	Apr 20	Apr 21	Apr 22	Apr 23	Apr 24	Apr 25	Apr 26	Apr 27	Apr 28	Apr 29	Apr 30
Mean significant wave height (ft)	5	4	2	1	6	6	3	4	3	2	3	1	1	1	1	1	1	2	1	1	3	2	1	2	3	1	2	QC rejected	2	1
Mean maximum wave height (ft)	7	5	2	1	9	8	5	5	3	3	3	1	0	0	1	1	2	3	2	0	4	3	1	2	4	1	2	8	2	1
Mean peak period (s)	6	5	4	4	6	6	5	4	5	4	4	4	4	7	5	5	4	4	4	5	5	4	4	4	5	6	4	6	4	4
Mean zero-crossing period (s)	4	4	3	3	5	5	4	4	4	3	4	3	3	4	3	3	3	3	3	4	4	4	3	3	4	3	3	5	3	3
Mean peak wave direction	ENEconcentration 83%	ENEconcentration 99%	ENEconcentration 91%	NWconcentration 36%	NNWconcentration 91%	NNWconcentration 98%	NNEconcentration 82%	SWconcentration 83%	Variableconcentration 14%	NNEconcentration 98%	Nconcentration 94%	Wconcentration 39%	Sconcentration 30%	SSEconcentration 52%	SEconcentration 68%	Sconcentration 61%	Sconcentration 82%	Sconcentration 98%	Sconcentration 95%	SSEconcentration 72%	NEconcentration 89%	ENEconcentration 92%	ESEconcentration 69%	ESEconcentration 57%	ENEconcentration 97%	ESEconcentration 65%	NWconcentration 76%	NEconcentration 97%	NEconcentration 92%	NNEconcentration 75%
Mean wave direction	ENEconcentration 91%	ENEconcentration 99%	ENEconcentration 95%	Variableconcentration 24%	NNWconcentration 92%	NNWconcentration 98%	Nconcentration 84%	SWconcentration 93%	Variableconcentration 16%	NNEconcentration 99%	Nconcentration 95%	WNWconcentration 37%	Sconcentration 59%	SSEconcentration 78%	SEconcentration 85%	Sconcentration 85%	Sconcentration 89%	Sconcentration 99%	Sconcentration 99%	SSEconcentration 89%	NEconcentration 88%	Econcentration 96%	ESEconcentration 92%	ESEconcentration 86%	Econcentration 98%	ESEconcentration 77%	NWconcentration 69%	NEconcentration 98%	NEconcentration 93%	NEconcentration 84%
Mean directional spread (°)	24.7	27.7	32.4	33.4	23.0	24.9	28.8	25.0	39.8	28.2	33.2	40.7	42.2	36.9	35.4	37.1	27.5	25.6	29.2	33.7	23.4	33.1	36.0	40.3	24.2	34.2	28.6	27.3	35.3	36.7
Mean wind direction	ENEconcentration 98%	NEconcentration 94%	NEconcentration 82%	Wconcentration 69%	NNWconcentration 93%	NWconcentration 98%	WNWconcentration 69%	WSWconcentration 97%	NNWconcentration 78%	Nconcentration 99%	NNWconcentration 80%	Variableconcentration 27%	Wconcentration 48%	ENEconcentration 63%	SEconcentration 80%	Sconcentration 96%	Sconcentration 98%	Sconcentration 99%	SSEconcentration 97%	NNEconcentration 41%	ENEconcentration 78%	ESEconcentration 71%	Econcentration 95%	Econcentration 83%	ENEconcentration 95%	ESEconcentration 66%	NNWconcentration 85%	NEconcentration 98%	NEconcentration 89%	NEconcentration 78%
Mean wind speed (mph)	21	15	7	9	24	22	14	19	12	14	13	6	5	5	8	9	11	14	11	7	14	6	9	10	17	7	14	20	9	8
Mean water temperature(°C)	8.4	8.4	8.6	8.6	8.4	8.4	8.4	8.3	8.3	8.3	8.4	8.5	8.6	8.6	8.5	8.5	8.8	8.7	8.9	9.4	9.2	9.4	9.4	9.7	9.3	9.1	9.2	8.8	8.8	8.9

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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.

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