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Hornsea wave buoy daily means for Dec 2025

Daily means from the Hornsea wave buoy for Dec 2025, 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

1,486 wave-buoy observations covered all 31 days. Typical wave height was 3.2 ft (10th–90th percentile 1.7–6.1 ft), while mean average of more than one wave period type was 7.6 seconds (10th–90th percentile 3.6–12.9 seconds). Mean water temperature was 8.7°C (10th–90th percentile 8–9.1°C). 25 of 5,908 checked values (0.4%) were excluded by quality control. Across 15 comparable years, mean wave height was above the same-month mean of 3.2 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

3.2ft
Mean: 3.6 ft
P10–P90: 1.7 — 6.1 ft
Recorded extremes

1.1 — 8.5 ft

Mean Observed Wave Period

7.6secs
P10–P90: 3.6 — 12.9secs
Recorded extremes

2 — 22.2secs

Observed Wave Direction

E

Circular concentration: 66%

Mean Water Temperature

8.7°C
P10–P90: 8 — 9.1°C
Recorded extremes

7.5 — 9.3°C

Compared With Previous Decembers

Historical baseline from 22,120 observations across 15 years.

Wave Height
3.6ft
0.4ft above mean
Historical mean 3.182ft
Wave Period
7.6s
1.2s below mean
Historical mean 8.8s
Water Temperature
8.7°C
0.4°C above mean
Historical mean 8.3°C

Chart showing grouped wave observations for Hornsea. 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 Hornsea wave buoy

Hornsea is a Channel Coastal Observatory wave station off the rapidly eroding Holderness coast of East Yorkshire. Its North Sea record provides local wave context for Hornsea's defended frontage and the adjacent soft-cliff coastline, where storms drive substantial shoreline change.

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.
Hornsea wave buoy daily means Dec 2025Last observation shown
Metric
Mean significant wave height (ft)5324432232232332233235667545565
Mean maximum wave height (ft)743665335434355345435891011878798
Mean peak period (s)711105765454510946976168678877610121111
Mean zero-crossing period (s)4434443333343344343345555546566
Mean energy period (s)-------------------------------
Mean wave power, kilowatts per metre-------------------------------
Mean peak wave directionESEconcentration 75%NEconcentration 74%NEconcentration 70%ESEconcentration 97%ESEconcentration 80%ESEconcentration 98%SEconcentration 56%SSEconcentration 77%SEconcentration 99%SSEconcentration 80%SSEconcentration 54%NEconcentration 69%NEconcentration 62%SSEconcentration 98%SEconcentration 100%ENEconcentration 67%ESEconcentration 66%SEconcentration 99%NEconcentration 64%Econcentration 69%Econcentration 99%ENEconcentration 100%ENEconcentration 100%ENEconcentration 100%Econcentration 100%Econcentration 100%ENEconcentration 94%NNEconcentration 100%NNEconcentration 100%NNEconcentration 100%NNEconcentration 100%
Mean directional spread (°)15.419.222.116.220.819.627.023.617.320.523.817.220.014.913.222.321.715.740.729.619.617.518.220.417.316.025.114.815.014.413.7
Mean water temperature(°C)9.29.19.09.09.09.09.19.19.19.19.19.08.98.88.99.08.98.98.88.78.78.78.78.58.38.18.08.08.07.87.7

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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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