Skip to content
Surfhog home
Menu

Greenwich wave buoy daily means for Jul 2022

Daily means from the Greenwich wave buoy for Jul 2022, 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

742 wave-buoy observations covered all 31 days. Typical wave height was 1 ft (10th–90th percentile 0.7–2 ft), while mean reported wave period; measurement type unavailable was 8.6 seconds (10th–90th percentile 5–14 seconds). Typical wind was 12.8 mph (10th–90th percentile 4.8–20.8 mph) and mean water temperature was 16.9°C (10th–90th percentile 15.5–17.9°C). 49 of 3,710 checked values (1.3%) were excluded by quality control. Across 11 comparable years, mean wave height was below the same-month mean of 1.4 ft and mean wave period was above the same-month mean of 6.1 seconds.

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

Typical Wave Height

1ft
Mean: 1.1 ft
P10–P90: 0.7 — 2 ft
Recorded extremes

0 — 4.9 ft

Mean Wave Period

8.6secs
P10–P90: 5 — 14secs
Recorded extremes

5 — 26secs

Available for 693 of 742 hourly samples

Mean Water Temperature

16.9°C
P10–P90: 15.5 — 17.9°C
Recorded extremes

14.9 — 19.7°C

Typical Wind

Variable, 12.8mph
Mean: 12.6 mph
P10–P90: 4.8 — 20.8 mph
Recorded extremes

0 — 30 mph

Circular concentration: 16%

Compared With Previous Julys

Historical baseline from 6,501 observations across 11 years.

Wave Height
1.1ft
0.3ft below mean
Historical mean 1.4ft
Wave Period
8.6s
2.5s above mean
Historical mean 6.1s
Water Temperature
16.9°C
1.1°C above mean
Historical mean 15.8°C

Chart showing grouped wave observations for Greenwich. 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 Greenwich wave buoy

Greenwich Lightship (WMO 62305) is a UK Met Office station in the southern North Sea on the Greenwich meridian. It monitors marine conditions between the Dover Strait and the Thames approaches. The station feed can include wind, wave height, pressure, visibility, and air and sea temperature.

Metrics are rows; days run left to right.
Greenwich wave buoy daily means Jul 2022Last observation shown
Metric
Mean wave height (ft)2111111111111111111111123211112
Mean observed period(s)6Reported6Reported6Reported6Reported6Reported8Reported7Reported9Reported11Reported13Reported17Reported16Reported12Reported9Reported8Reported13Reported10Reported14Reported10Reported6Reported8Reported6Reported8Reported7Reported7Reported7Reported7Reported6Reported7Reported7Reported5Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionWSWconcentration 99%SWconcentration 87%WSWconcentration 98%WNWconcentration 94%WNWconcentration 88%WNWconcentration 82%WNWconcentration 78%WSWconcentration 80%NNWconcentration 35%ENEconcentration 72%ENEconcentration 84%SSEconcentration 87%WNWconcentration 83%NNWconcentration 52%Variableconcentration 28%NEconcentration 71%Econcentration 88%Econcentration 89%Variableconcentration 28%SWconcentration 89%NWconcentration 52%ENEconcentration 95%Wconcentration 56%SSWconcentration 66%WSWconcentration 98%WNWconcentration 82%Econcentration 94%Econcentration 98%ENEconcentration 81%Wconcentration 69%WSWconcentration 98%
Mean wind speed (mph)181116151315117769107128111313171210191192491517101322
Mean water temperature(°C)15.215.515.415.515.815.915.916.617.417.518.117.416.916.616.716.816.817.117.117.117.517.117.418.017.417.417.317.217.717.517.4

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.

Which wave period is shown?

The table shows the best period measurement supplied for each observation. It is not necessarily the energy period used to calculate wave power.

Tp
Peak period: the period at the strongest spectral peak.
Tavg
The provider's average wave period.
Tm02
A mean period calculated from the wave spectrum.
Tz
Mean zero-crossing period.
Reported
A legacy value whose period type was not recorded.
Mixed
A daily or monthly mean containing more than one period type.

Wave power needs a genuine energy period (Te). SurfHog does not substitute Tp, Tavg, Tm02 or Tz when Te is missing.

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.

› Wave Buoy List