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Fjaltring wave buoy daily means for Dec 1998

Daily means from the Fjaltring wave buoy for Dec 1998, 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

255 wave-buoy observations covered all 31 days. Typical wave height was 4.8 ft (10th–90th percentile 2.3–8.1 ft), while mean average wave period was 5.4 seconds (10th–90th percentile 4.2–6.2 seconds). All 765 checked values passed quality control.

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

Typical Significant Wave Height

4.8ft
Mean: 5.4 ft
P10–P90: 2.3 — 8.1 ft
Recorded extremes

1.3 — 19.7 ft

Mean Observed Wave Period

5.4secs
P10–P90: 4.2 — 6.2secs
Recorded extremes

3.3 — 8.9secs

Typical Observed Wind

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

Available for 0 of 255 hourly samples

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 255 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 1998Last observation shown
Metric
Mean significant wave height (ft)223576335333556676585QC rejected5578168543
Mean maximum wave height (ft)3451011105585568810101210913959812132713965
Mean average period (s)7546554454445566656664556686644
Mean zero-crossing period (s)6545554454445555555664555686544
Mean peak wave directionNWconcentration 100%NWconcentration 100%WNWconcentration 92%NWconcentration 98%NNWconcentration 95%NNWconcentration 98%NNWconcentration 100%Wconcentration 71%WSWconcentration 93%SWconcentration 77%Wconcentration 67%SWconcentration 87%WNWconcentration 77%Wconcentration 99%Wconcentration 91%WNWconcentration 100%Wconcentration 97%WSWconcentration 100%WNWconcentration 95%NWconcentration 100%NWconcentration 100%Wconcentration 76%WSWconcentration 99%Wconcentration 86%WSWconcentration 100%Wconcentration 99%Wconcentration 96%WSWconcentration 99%Wconcentration 99%SWconcentration 99%SWconcentration 99%

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.

Observation data source

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

› Wave Buoy List