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M4 wave buoy daily averages for Dec 2025 last observation shown Data available:  to  Monthly averages for

Average Wave Height

14 ft
3.9 — 25.3 ft

Average Wave period

9 secs
5 — 12 secs

Average Water temperature

11 °C
10.8 — 11.6 °C

Average Wind

S, 22 mph
2 — 49 mph

Chart showing grouped wave observations for M4. Use the table on this page for a text version of the same measurements.

About M4 wave buoy

M4 is an offshore data buoy in the Atlantic approaches (55.0000°N, 10.0000°W). It supports marine forecasting by providing real‑time sea‑state and weather observations in open water. It typically reports directional waves and meteorology.

M4 wave buoy daily averages Dec 2025 last observation shown
Day Wave height (ft) Wave Period (s) Wind Direction Wind Speed (mph) Water Temp (°C)
13 8 SW 19 11.6
19 9 SW 27 11.6
14 8 SW 20 11.6
18 10 SSW 20 11.5
15 8 SSE 27 11.5
17 10 WSW 16 11.5
12 8 SSW 19 11.5
14 9 S 24 11.5
16 9 SSE 32 11.5
18 8 SW 35 11.5
20 10 SSW 31 11.4
22 11 SW 28 11.4
23 10 SSW 37 11.4
15 9 SW 24 11.4
17 10 SW 22 11.4
16 9 SW 26 11.3
18 9 SSW 32 11.4
25 11 SW 31 11.3
21 10 SW 28 11.3
14 8 SE 31 11.3
18 11 SE 14 11.3
10 9 ENE 7 11.3
8 9 ENE 7 11.2
9 9 E 17 11.2
7 7 ESE 17 11.2
5 6 ENE 17 11.2
5 6 ENE 19 11.1
5 7 E 13 11.2
5 8 E 13 11.3
5 7 ESE 14 11.1
6 8 WSW 14 11.1

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