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Fjaltring wave buoy monthly means for 2021

Monthly means from the Fjaltring wave buoy for 2021, including available wave height, period, direction, wind and sea temperature data.

Last observation shown

Data available:  to 

Latest

Period Summary

Programmatically generated summary. Hog Says

16,825 wave-buoy observations covered 355 of 365 days (97%). Typical wave height was 3.5 ft (10th–90th percentile 1.4–7 ft), while mean average of more than one wave period type was 4.8 seconds (10th–90th percentile 3.6–5.8 seconds). 3 of 50,314 checked values (0%) were excluded by quality control.

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

Typical Significant Wave Height

3.5ft
Mean: 3.9 ft
P10–P90: 1.4 — 7 ft
Recorded extremes

0.4 — 17.1 ft

Available for 8,414 of 8,427 hourly samples

Mean Observed Wave Period

4.8secs
P10–P90: 3.6 — 5.8secs
Recorded extremes

2.4 — 12.1secs

Available for 8,426 of 8,427 hourly samples

Typical Observed Wind

-, -mph
Mean: - mph
P10–P90: - — - mph

Available for 0 of 8,427 hourly samples

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 8,427 hourly samples

Chart showing grouped wave observations for Fjaltring. Use the table on this page for a text version of the same measurements. To open daily observations, use a linked month name in the table.

About Fjaltring wave buoy

Fjaltring is a Danish Coastal Authority directional buoy off the exposed central west coast of Jutland. The authority has maintained a continuous wave-measurement programme here since 1980, creating a key reference for Denmark's most erosion-prone coast and the long-running Lodbjerg–Nymindegab protection works.

Its current data source reports wave height, wave period and wave direction.

Metrics are rows; months run left to right.
Fjaltring wave buoy monthly means 2021Last observation shown
Metric
Mean significant wave height (ft)434533344654
Mean average wave height (ft)------------
Mean maximum wave height (ft)757855567997
Mean average period (s)545544455555
Mean zero-crossing period (s)545544445555
Mean maximum wave period (s)------------
Mean peak wave directionWNWconcentration 83%WNWconcentration 59%WNWconcentration 87%NWconcentration 94%WNWconcentration 76%WNWconcentration 86%WNWconcentration 69%WNWconcentration 72%Wconcentration 81%Wconcentration 83%WNWconcentration 87%Wconcentration 74%

Swipe sideways to see more months.

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 Danish Coastal Authority wave-measurement network.

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

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