St Mary's Sound wave buoy daily means for Mar 2023

Daily means from the St Mary's Sound wave buoy for Mar 2023, including available wave height, period, direction, wind and sea temperature data.

Last observation shown Fri, Mar 31, 2023, 23:30

Data available: Sun, Jul 3, 2016 to Sat, Aug 22, 2026

Monthly means for 2023

Period Summary

Hog Says

1,483 wave-buoy observations covered all 31 days. Typical wave height was 6 ft (10th–90th percentile 2.6–9.3 ft), while mean average of more than one wave period type was 9.9 seconds (10th–90th percentile 6.2–14.3 seconds). Mean water temperature was 10.4°C (10th–90th percentile 10.1–10.7°C). 17 of 5,877 checked values (0.3%) were excluded by quality control. Across 6 comparable years, mean wave height was above the same-month mean of 5 ft and mean wave period was above the same-month mean of 8.1 seconds.

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

Typical Significant Wave Height

6ft

Mean: 6 ft

P10–P90: 2.6 — 9.3 ft

Recorded extremes

1.2 — 17.5 ft

Mean Observed Wave Period

9.9secs

P10–P90: 6.2 — 14.3secs

Recorded extremes

3.7 — 20secs

Observed Wave Direction

SSW

Circular concentration: 87%

Mean Water Temperature

10.4°C

P10–P90: 10.1 — 10.7°C

Recorded extremes

10 — 10.9°C

Compared With Previous Marchs

Historical baseline from 4,457 observations across 6 years.

Wave Height: 6ft; 1ft above mean; Historical mean 5ft
Wave Period: 9.9s; 1.8s above mean; Historical mean 8.1s
Water Temperature: 10.4°C; 0.4°C above mean; Historical mean 10°C

Show 10th–90th percentile ranges

About St Mary's Sound wave buoy

St Mary's Sound station lies between St Mary's and St Agnes in the Isles of Scilly. The National Network first deployed a Datawell Directional WaveRider here in May 2014, establishing a nearshore record for an archipelago exposed to Atlantic swell and important to local navigation and coastal management.

Its current data source reports wave height, wave period, wave direction, directional spread, wave power and sea temperature.

St Mary's Sound wave buoy daily means Mar 2023Last observation shown Mar 2023
Metric	Mar 1	Mar 2	Mar 3	Mar 4	Mar 5	Mar 6	Mar 7	Mar 8	Mar 9	Mar 10	Mar 11	Mar 12	Mar 13	Mar 14	Mar 15	Mar 16	Mar 17	Mar 18	Mar 19	Mar 20	Mar 21	Mar 22	Mar 23	Mar 24	Mar 25	Mar 26	Mar 27	Mar 28	Mar 29	Mar 30	Mar 31
Mean significant wave height (ft)	5	3	3	3	2	2	3	7	8	6	7	6	QC rejected	7	5	8	7	5	3	4	6	8	8	8	6	6	4	8	7	8	11
Mean maximum wave height (ft)	7	4	5	4	3	2	5	12	13	10	11	10	17	10	8	12	10	8	5	7	10	13	13	13	10	9	6	14	11	13	18
Mean peak period (s)	9	8	17	13	14	13	15	8	9	11	9	9	11	12	9	8	9	10	9	6	8	9	9	9	9	10	10	8	7	8	12
Mean zero-crossing period (s)	5	4	5	5	5	5	5	6	6	6	6	6	7	6	5	5	5	6	5	4	5	6	6	6	6	6	5	6	5	6	7
Mean energy period (s)	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
Mean wave power, kilowatts per metre	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
Mean peak wave direction	ESEconcentration 58%	Variableconcentration 30%	SSWconcentration 99%	SWconcentration 98%	SWconcentration 86%	SWconcentration 82%	SSWconcentration 89%	SSWconcentration 93%	SSWconcentration 99%	SSWconcentration 95%	Sconcentration 84%	SSWconcentration 96%	SWconcentration 99%	SWconcentration 95%	SWconcentration 95%	SSWconcentration 97%	SWconcentration 98%	SWconcentration 99%	SWconcentration 98%	SSWconcentration 97%	SSWconcentration 96%	SWconcentration 96%	SSWconcentration 98%	SSWconcentration 96%	SWconcentration 90%	SWconcentration 95%	SWconcentration 95%	SSWconcentration 100%	SSWconcentration 98%	SSWconcentration 99%	SSWconcentration 99%
Mean directional spread (°)	31.3	36.9	41.6	51.5	63.1	56.8	48.2	33.2	32.9	42.6	30.0	38.5	32.3	43.3	43.0	33.4	36.1	37.4	44.6	35.0	36.8	38.3	40.0	36.4	48.8	44.5	53.4	28.8	32.5	32.1	29.8
Mean water temperature(°C)	10.1	10.1	10.1	10.1	10.1	10.1	10.1	10.2	10.3	10.3	10.3	10.3	10.3	10.3	10.3	10.3	10.4	10.5	10.4	10.4	10.5	10.6	10.6	10.6	10.6	10.6	10.6	10.7	10.7	10.8	10.8

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The observation data displayed on this page is from the Regional Coastal Monitoring Programme.

Learn how SurfHog combines, checks and summarizes observations in the data and methodology notes.

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