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Chesil wave buoy daily means for Jun 2018

Daily means from the Chesil wave buoy for Jun 2018, 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 0.5–3 ft), while mean average of more than one wave period type was 8.4 seconds (10th–90th percentile 4.9–12.7 seconds). Mean water temperature was 14.4°C (10th–90th percentile 13–15.9°C). 35 of 5,692 checked values (0.6%) were excluded by quality control. Across 8 comparable years, mean wave height was below the same-month mean of 2.5 ft and mean wave period was above the same-month mean of 7.4 seconds.

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

Typical Significant Wave Height

1.1ft
Mean: 1.5 ft
P10–P90: 0.5 — 3 ft
Recorded extremes

0.3 — 5.9 ft

Mean Observed Wave Period

8.4secs
P10–P90: 4.9 — 12.7secs
Recorded extremes

1.8 — 15.4secs

Available for 713 of 720 hourly samples

Observed Wave Direction

SSW

Circular concentration: 83%

Mean Water Temperature

14.4°C
P10–P90: 13 — 15.9°C
Recorded extremes

12.7 — 17.6°C

Compared With Previous Junes

Historical baseline from 11,496 observations across 8 years.

Wave Height
1.5ft
1ft below mean
Historical mean 2.461ft
Wave Period
8.4s
1s above mean
Historical mean 7.4s
Water Temperature
14.4°C
0.3°C above mean
Historical mean 14.1°C

Chart showing grouped wave observations for Chesil. 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 Chesil wave buoy

Chesil is a Channel Coastal Observatory National Network wave station off Dorset's exposed Jurassic Coast. It records waves approaching Chesil Beach and the western side of Portland, providing a nearshore reference for the long shingle barrier and the communities and infrastructure behind it.

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.
Chesil wave buoy daily means Jun 2018Last observation shown
Metric
Mean significant wave height (ft)221111111111143343321111011111
Mean maximum wave height (ft)331222222111264565432111112212
Mean peak period (s)8788910101110976567666571012131314128687
Mean zero-crossing period (s)645665665555444444434444544445
Mean energy period (s)------------------------------
Mean wave power, kilowatts per metre------------------------------
Mean peak wave directionSWconcentration 90%SWconcentration 99%WSWconcentration 86%SWconcentration 97%SSWconcentration 73%WSWconcentration 80%WSWconcentration 93%SWconcentration 95%SWconcentration 88%SSWconcentration 87%Sconcentration 91%Sconcentration 98%SSWconcentration 94%SWconcentration 100%SWconcentration 99%SWconcentration 100%SWconcentration 100%SWconcentration 100%SWconcentration 99%SWconcentration 99%SWconcentration 96%SSWconcentration 71%SSWconcentration 67%SSWconcentration 73%SSWconcentration 87%SSWconcentration 78%Sconcentration 83%SSEconcentration 92%Sconcentration 86%SSEconcentration 95%
Mean directional spread (°)47.741.955.753.847.464.358.861.355.660.346.438.941.024.735.230.826.124.830.639.259.265.666.768.365.864.339.637.044.936.0
Mean water temperature(°C)13.013.413.513.412.913.313.313.613.714.114.413.613.714.014.214.414.514.614.814.814.714.815.115.315.915.915.816.016.216.3

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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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