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Fjaltring wave buoy daily means for Dec 1991

Daily means from the Fjaltring wave buoy for Dec 1991, 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

319 wave-buoy observations covered 21 of 31 days (68%). Typical wave height was 6.8 ft (10th–90th percentile 3.6–11.6 ft), while mean average of more than one wave period type was 5.5 seconds (10th–90th percentile 4.2–6.9 seconds). All 639 checked values passed quality control.

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

Typical Significant Wave Height

6.8ft
Mean: 7.2 ft
P10–P90: 3.6 — 11.6 ft
Recorded extremes

2.8 — 17.4 ft

Available for 158 of 169 hourly samples

Mean Observed Wave Period

5.5secs
P10–P90: 4.2 — 6.9secs
Recorded extremes

3.6 — 8.5secs

Typical Observed Wind

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

Available for 0 of 169 hourly samples

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 169 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 hourly observations, use a linked day 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; days run left to right.
Fjaltring wave buoy daily means Dec 1991Last observation shown
Metric
Mean significant wave height (ft)----------358854598QC rejected8491261164675
Mean average wave height (ft)-------------------------------
Mean maximum wave height (ft)----------6814149791514261381519101910810119
Mean average period (s)----------446655566765675765555
Mean zero-crossing period (s)----------446655466865675764555
Mean maximum wave period (s)-------------------------------
Mean peak wave direction----------SWconcentration 100%SWconcentration 97%Wconcentration 100%Wconcentration 100%Wconcentration 99%Wconcentration 93%SWconcentration 100%Wconcentration 96%Wconcentration 94%WNWconcentration 96%WNWconcentration 97%Wconcentration 87%Wconcentration 97%NWconcentration 99%WNWconcentration 91%WNWconcentration 97%NWconcentration 99%WNWconcentration 99%WNWconcentration 98%NWconcentration 100%Wconcentration 75%

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 Danish Coastal Authority wave-measurement network.

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

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