Skip to content
Surfhog home
Menu

Chesil wave buoy daily means for Mar 2021

Daily means from the Chesil wave buoy for Mar 2021, 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

1,483 wave-buoy observations covered all 31 days. Typical wave height was 1.9 ft (10th–90th percentile 1–7.2 ft), while mean average of more than one wave period type was 10 seconds (10th–90th percentile 5.2–15.4 seconds). Mean water temperature was 8.5°C (10th–90th percentile 8.1–9.2°C). 12 of 5,854 checked values (0.2%) were excluded by quality control. Across 11 comparable years, mean wave height was the same as the same-month mean of 3.2 ft and mean wave period was above the same-month mean of 9.5 seconds.

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

Typical Significant Wave Height

1.9ft
Mean: 3.2 ft
P10–P90: 1 — 7.2 ft
Recorded extremes

0.8 — 14.3 ft

Mean Observed Wave Period

10secs
P10–P90: 5.2 — 15.4secs
Recorded extremes

2.6 — 22.2secs

Available for 740 of 742 hourly samples

Observed Wave Direction

SW

Circular concentration: 94%

Mean Water Temperature

8.5°C
P10–P90: 8.1 — 9.2°C
Recorded extremes

7.8 — 10°C

Compared With Previous Marchs

Historical baseline from 16,314 observations across 11 years.

Wave Height
3.2ft
0ft above mean
Historical mean 3.182ft
Wave Period
10s
0.5s above mean
Historical mean 9.5s
Water Temperature
8.5°C
0.1°C above mean
Historical mean 8.4°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 2021Last observation shown
Metric
Mean significant wave height (ft)22211221281089532111211223656422
Mean maximum wave height (ft)333223323131512148532223223341089633
Mean peak period (s)1111131110141614108131010776811151513127667777911
Mean zero-crossing period (s)5566667645656544546664344555566
Mean energy period (s)-------------------------------
Mean wave power, kilowatts per metre-------------------------------
Mean peak wave directionSSWconcentration 93%SSWconcentration 90%SWconcentration 96%SWconcentration 99%SSWconcentration 93%SSWconcentration 92%SSWconcentration 90%SSWconcentration 92%SWconcentration 96%SWconcentration 100%SWconcentration 99%SWconcentration 100%SWconcentration 100%SWconcentration 98%SWconcentration 99%SWconcentration 94%SWconcentration 98%SSWconcentration 94%SSWconcentration 92%SSWconcentration 84%SSWconcentration 95%SSWconcentration 91%SWconcentration 99%SWconcentration 95%SSWconcentration 96%SWconcentration 100%SWconcentration 99%SWconcentration 100%SWconcentration 100%SSWconcentration 95%SWconcentration 95%
Mean directional spread (°)38.742.348.038.137.449.660.557.144.016.321.518.715.618.724.232.347.255.052.952.751.956.441.331.530.117.120.118.024.339.340.1
Mean water temperature(°C)8.07.98.08.18.28.28.28.28.28.28.28.28.28.28.38.38.48.48.58.68.68.78.88.98.99.09.09.29.49.39.4

Swipe sideways to see more days.

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.

› Wave Buoy List