Cup counter anemometer.

Llansadwrn (Anglesey) Weather

Historical archive: Climatological averages of observations

at Llyn Llydaw, Snowdon

IBP UK/PT Grassland Project (1967 - 1971)

 

Logo: Llansadwrn Weather - Melin Llynnon, Ynys Môn.

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Monthly mean climatological observations from 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

Solar radiation (kj per sq. cm) [1967 - 1971]    6.6  11.6  18.5  31.8  44.2  54.8  44.3  39.6  23.7  18.8   7.7   6.6   308.2
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Source: D. Perkins (1978). International Biological Programme Data Set (UK/PT/3)

 

These pages are designed and written by Donald Perkins © 1998 - 2006

http://www.llansadwrn-wx.co.uk

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