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Chesil wave buoy daily means for Mar 2013

Daily means from the Chesil wave buoy for Mar 2013, 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

1,484 wave-buoy observations covered all 31 days. Typical wave height was 2.3 ft (10th–90th percentile 1.1–5.1 ft), while mean average of more than one wave period type was 10.1 seconds (10th–90th percentile 5.8–14.8 seconds). Mean water temperature was 6.7°C (10th–90th percentile 6.3–7°C). 9 of 5,818 checked values (0.2%) were excluded by quality control. Across 3 comparable years, mean wave height was above the same-month mean of 2.3 ft and mean wave period was above the same-month mean of 9.7 seconds.

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

Typical Significant Wave Height

2.3ft
Mean: 2.7 ft
P10–P90: 1.1 — 5.1 ft
Recorded extremes

0.7 — 10.3 ft

Available for 740 of 742 hourly samples

Mean Observed Wave Period

10.1secs
P10–P90: 5.8 — 14.8secs
Recorded extremes

2.4 — 22.2secs

Available for 740 of 742 hourly samples

Observed Wave Direction

SSW

Circular concentration: 89%

Mean Water Temperature

6.7°C
P10–P90: 6.3 — 7°C
Recorded extremes

6.1 — 7.7°C

Available for 739 of 742 hourly samples

Compared With Previous Marchs

Historical baseline from 4,453 observations across 3 years.

Wave Height
2.7ft
0.4ft above mean
Historical mean 2.264ft
Wave Period
10.1s
0.4s above mean
Historical mean 9.7s
Water Temperature
6.7°C
1.3°C below mean
Historical mean 8°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 Mar 2013Last observation shown
Metric
Mean significant wave height (ft)222212334532115QC rejected322235532211233
Mean maximum wave height (ft)22332455675322813533348843321354
Mean peak period (s)1113108101213111114109711688887811131297711111714
Mean zero-crossing period (s)6644477779663446556546887655586
Mean energy period (s)-------------------------------
Mean wave power, kilowatts per metre-------------------------------
Mean peak wave directionSconcentration 94%SSWconcentration 90%SSWconcentration 86%SSWconcentration 87%SWconcentration 89%SWconcentration 94%SWconcentration 100%SWconcentration 100%SWconcentration 100%SWconcentration 100%Sconcentration 94%Sconcentration 99%SWconcentration 78%SWconcentration 86%SWconcentration 100%SWconcentration 100%SWconcentration 99%SWconcentration 100%SWconcentration 100%SWconcentration 100%SSWconcentration 87%SWconcentration 100%SWconcentration 100%SWconcentration 98%SSWconcentration 93%Sconcentration 95%Sconcentration 96%Sconcentration 70%SSWconcentration 88%SWconcentration 99%SWconcentration 97%
Mean directional spread (°)45.156.643.134.155.542.532.128.820.325.621.328.135.048.819.916.424.134.838.844.334.615.014.123.029.430.539.061.744.340.831.5
Mean water temperature(°C)7.06.96.86.86.86.87.07.17.37.26.96.56.56.46.46.56.66.66.66.86.76.96.96.86.76.56.46.36.36.36.3

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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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