St Mary's Sound wave buoy daily means for Nov 2020

Daily means from the St Mary's Sound wave buoy for Nov 2020, including available wave height, period, direction, wind and sea temperature data.

Last observation shown Mon, Nov 30, 2020, 23:30

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

Monthly means for 2020

Period Summary

Hog Says

1,436 wave-buoy observations covered all 30 days. Typical wave height was 4.6 ft (10th–90th percentile 2.8–8.3 ft), while mean average of more than one wave period type was 8.5 seconds (10th–90th percentile 5.2–12.2 seconds). Typical wind was 0 mph and mean water temperature was 12.6°C (10th–90th percentile 12.2–12.8°C). 20 of 6,423 checked values (0.3%) were excluded by quality control. Across 4 comparable years, mean wave height was above the same-month mean of 4.9 ft and mean wave period was below the same-month mean of 8.8 seconds.

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

Typical Significant Wave Height

4.6ft

Mean: 5.1 ft

P10–P90: 2.8 — 8.3 ft

Recorded extremes

1.9 — 13.5 ft

Mean Observed Wave Period

8.5secs

P10–P90: 5.2 — 12.2secs

Recorded extremes

3.6 — 15.4secs

Available for 714 of 719 hourly samples

Observed Wave Direction

SSW

Circular concentration: 54%

Mean Water Temperature

12.6°C

P10–P90: 12.2 — 12.8°C

Recorded extremes

12.2 — 13.1°C

Compared With Previous Novembers

Historical baseline from 2,876 observations across 4 years.

Wave Height: 5.1ft; 0.2ft above mean; Historical mean 4.856ft
Wave Period: 8.5s; 0.3s below mean; Historical mean 8.8s
Water Temperature: 12.6°C; 0.3°C below mean; Historical mean 12.9°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 Nov 2020Last observation shown Nov 2020
Metric	Nov 1	Nov 2	Nov 3	Nov 4	Nov 5	Nov 6	Nov 7	Nov 8	Nov 9	Nov 10	Nov 11	Nov 12	Nov 13	Nov 14	Nov 15	Nov 16	Nov 17	Nov 18	Nov 19	Nov 20	Nov 21	Nov 22	Nov 23	Nov 24	Nov 25	Nov 26	Nov 27	Nov 28	Nov 29	Nov 30
Mean significant wave height (ft)	9	9	6	3	3	8	5	5	6	4	8	7	6	8	9	6	5	6	4	3	4	3	3	5	3	3	4	4	4	2
Mean maximum wave height (ft)	15	14	9	5	5	12	8	7	9	6	12	11	9	12	13	9	9	10	7	5	6	5	5	8	5	4	5	6	7	3
Mean peak period (s)	9	10	10	13	9	7	6	8	8	8	7	9	9	8	10	9	8	7	10	9	9	12	10	6	10	11	7	5	6	9
Mean zero-crossing period (s)	6	6	6	5	4	5	5	5	5	5	5	6	5	5	6	6	5	5	5	4	4	5	5	5	6	5	4	4	4	5
Mean energy period (s)	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
Mean reported period (s)	0	0	0	0	0	0	0	0	4	5	5	6	5	5	6	5	5	5	5	4	4	5	5	5	6	5	4	4	4	5
Mean wave power, kilowatts per metre	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
Mean peak wave direction	SSWconcentration 99%	SSWconcentration 98%	WSWconcentration 91%	NWconcentration 83%	Variableconcentration 18%	ESEconcentration 99%	SEconcentration 94%	SSWconcentration 98%	SSWconcentration 99%	SSWconcentration 99%	SSWconcentration 98%	SSWconcentration 100%	SWconcentration 96%	SSWconcentration 95%	SWconcentration 97%	SWconcentration 89%	SWconcentration 87%	SSWconcentration 87%	Wconcentration 81%	WSWconcentration 68%	WNWconcentration 83%	WNWconcentration 92%	WSWconcentration 73%	SSWconcentration 79%	Wconcentration 70%	NNWconcentration 65%	ESEconcentration 62%	ESEconcentration 95%	ESEconcentration 89%	SWconcentration 42%
Mean directional spread (°)	30.3	34.0	47.4	66.8	48.0	23.1	33.6	27.8	26.2	28.9	29.3	32.0	46.0	36.0	37.6	48.1	44.6	40.1	53.0	56.3	50.3	59.3	53.1	37.0	53.9	54.3	36.9	36.7	33.8	52.6
Mean reported wave direction	SSWconcentration 99%	SSWconcentration 98%	SWconcentration 90%	WNWconcentration 47%	Variableconcentration 22%	ESEconcentration 99%	SEconcentration 92%	SSWconcentration 97%	SSWconcentration 100%	SSWconcentration 99%	SSWconcentration 98%	SSWconcentration 100%	SWconcentration 94%	SSWconcentration 92%	SWconcentration 94%	SWconcentration 88%	SWconcentration 90%	SWconcentration 86%	Wconcentration 82%	WSWconcentration 66%	WNWconcentration 77%	WNWconcentration 78%	WSWconcentration 66%	SSWconcentration 78%	WNWconcentration 62%	NWconcentration 68%	ESEconcentration 81%	ESEconcentration 94%	ESEconcentration 87%	SSWconcentration 46%
Mean water temperature(°C)	13.0	13.0	12.8	12.8	12.8	12.8	12.8	12.8	12.8	12.8	12.8	12.7	12.6	12.7	12.6	12.5	12.5	12.5	12.4	12.4	12.4	12.3	12.3	12.3	12.3	12.3	12.2	12.2	12.2	12.2

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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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