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Llansadwrn (Anglesey) Weather
Historical archive: Monthly Means and Extremes of Climatological Observations
at Llyn Llydaw, Snowdon.
IBP UK/PT Grassland Project (1967 - 1971)
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Monthly Means and Extremes of Climatological Observations at Llyn Llydaw, Snowdon. IBP Grassland Project [1967 - 1971]
Main site Grid Ref: SH 636553 Altitude 488 m (1600 ft).
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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Air temperature (degC) [1966 -1971]
mean maximum 4.5 2.8 4.3 7.0 10.7 14.6 15.2 15.3 14.0 11.2 6.0 5.2 9.2
mean minimum 1.6 -0.5 0.5 2.3 5.7 9.3 10.3 10.7 9.7 7.5 2.6 1.5 5.1
mean (1/2 max + min) 3.1 1.2 2.4 4.7 8.2 12.0 12.8 13.0 11.9 9.4 4.3 3.4 7.2
highest maximum 13.4 9.9 18.8 17.3 21.0 24.0 25.8 23.0 22.4 22.5 12.8 17.2 25.8
lowest minimum -7.5 -8.2 -4.8 -5.3 -4.1 3.2 5.9 6.7 4.9 0.3 -3.8 -6.7 -8.2
Lowest grass minimum -11.5 -10.0 -13.0 -8.0 -5.5 -3.0 1.0 -1.0 -2.8 -3.6 -6.7 -15.0 -15.0
Soil temperatures (degC) [1968 - 1971]
15 cm 3.5 2.7 2.8 4.6 8.3 11.9 12.8 13.5 12.3 10.6 6.8 4.5 7.9
30 cm 3.9 3.2 2.6 4.8 7.8 11.2 12.3 12.7 12.1 10.7 7.2 5.2 7.8
60 cm 4.1 3.6 2.8 4.6 7.1 8.8 11.5 12.4 11.9 11.6 7.8 5.5 7.6
Rainfall (mm)
At main site [1966 - 1971] (overexposed) 272 296 214 225 179 212 112 257 229 318 329 289 2932
At 3 other gauges in vicinity [1945 - 1971] 409 292 262 241 193 252 300 343 397 338 376 417 3820
Wind velocity (m per sec) 1967 - 1971 4.46 4.86 4.53 3.18 3.62 3.13 3.45 3.66 3.36 4.50 5.12 4.58 4.04
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Source: D. Perkins (1978). International Biological Programme Data Set (UK/PT/3)
 "Llyn Llydaw IBP Met Station in snow.")
