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Seaford wave buoy daily means for Jun 2020

Daily means from the Seaford wave buoy for Jun 2020, 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

1,440 wave-buoy observations covered all 30 days. Typical wave height was 1.1 ft (10th–90th percentile 0.5–5.4 ft), while mean average of more than one wave period type was 5.5 seconds (10th–90th percentile 3–9.8 seconds). Mean water temperature was 16.3°C (10th–90th percentile 15.1–18°C). 3 of 5,732 checked values (0.1%) were excluded by quality control. Across 6 comparable years, mean wave height was above the same-month mean of 1.8 ft and mean wave period was below the same-month mean of 5.9 seconds.

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

Typical Significant Wave Height

1.1ft
Mean: 2 ft
P10–P90: 0.5 — 5.4 ft
Recorded extremes

0.3 — 8.4 ft

Mean Observed Wave Period

5.5secs
P10–P90: 3 — 9.8secs
Recorded extremes

1.7 — 15.4secs

Observed Wave Direction

SW

Circular concentration: 80%

Mean Water Temperature

16.3°C
P10–P90: 15.1 — 18°C
Recorded extremes

14.8 — 18.8°C

Compared With Previous Junes

Historical baseline from 4,175 observations across 6 years.

Wave Height
2ft
0.2ft above mean
Historical mean 1.804ft
Wave Period
5.5s
0.4s below mean
Historical mean 5.9s
Water Temperature
16.3°C
0.3°C above mean
Historical mean 16°C

Chart showing grouped wave observations for Seaford. 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 Seaford wave buoy

Seaford is a National Network Datawell Directional WaveRider in about 11 metres of water off East Sussex. First deployed on 22 January 2008, it records waves reaching Seaford Bay between Newhaven and Beachy Head and supports assessment of the town's exposed shingle frontage.

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

Metrics are rows; days run left to right.
Seaford wave buoy daily means Jun 2020Last observation shown
Metric
Mean significant wave height (ft)1111QC rejectedQC rejected21111121111131QC rejected211114675
Mean maximum wave height (ft)11116931122222111242632112710117
Mean peak period (s)76445655333444676445410891065676
Mean zero-crossing period (s)333344443333334443334453334554
Mean energy period (s)------------------------------
Mean reported period (s)76445655333544686445510891165676
Mean wave power, kilowatts per metre------------------------------
Mean peak wave directionSconcentration 70%Sconcentration 84%SSWconcentration 82%SSWconcentration 61%WSWconcentration 99%WSWconcentration 99%SWconcentration 98%SSWconcentration 84%SSWconcentration 86%SSWconcentration 97%SEconcentration 72%SEconcentration 95%SSEconcentration 97%Sconcentration 98%SWconcentration 90%SWconcentration 94%WSWconcentration 99%SWconcentration 97%WSWconcentration 99%SWconcentration 89%SSWconcentration 90%SWconcentration 98%SWconcentration 99%SSWconcentration 87%SSWconcentration 77%SWconcentration 82%SWconcentration 95%WSWconcentration 100%WSWconcentration 100%SWconcentration 99%
Mean directional spread (°)41.146.540.732.220.117.024.738.939.533.927.924.826.726.737.442.234.932.326.027.022.532.531.642.847.834.322.615.114.318.7
Mean reported wave directionSconcentration 68%Sconcentration 82%SSWconcentration 81%SSWconcentration 60%WSWconcentration 99%WSWconcentration 99%SWconcentration 98%SSWconcentration 79%SSWconcentration 85%SSWconcentration 97%SEconcentration 73%SEconcentration 88%SSEconcentration 97%Sconcentration 98%SWconcentration 89%SWconcentration 90%WSWconcentration 99%SWconcentration 97%WSWconcentration 98%SWconcentration 90%SSWconcentration 89%SWconcentration 96%SWconcentration 94%SWconcentration 84%SWconcentration 75%SWconcentration 80%SWconcentration 94%WSWconcentration 100%WSWconcentration 100%SWconcentration 99%
Mean water temperature(°C)15.315.615.415.215.215.115.115.015.215.115.115.015.315.816.516.716.616.216.216.916.817.317.317.317.417.617.518.418.618.4

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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 Regional Coastal Monitoring Programme.

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

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