Ken Cook
Happy New Year, everyone
Reports for December 2025 for the Copley sites. (Averages refer to 1991-2020)
Mild and dull.
(Differences from 1991-2020 averages in brackets)
Copley Lead Mill site 219metres asl
Temperature °C (09Z-09Z)
Mean maximum 6.8 (1.0) High 11.8 on 9th, Low 4.1 on 16th
Mean minimum 1.7 (1.7) Low -4.7 on 31st, High 6.8 on 15th
Mean screen 4.3 (1.4)
Mean 30cm earth 5.3 (0.6)
Air frost 10 (-7)
Days snow lying 50% 09Z, 0 (-8) snow on ground 0
Max depth 09Z 0cm on 0th
River Gaunless data (Copley Lead Mill Environment Agency monitoring site 09Z daily readings)
Mean level 0.23m, high 0.39m on 9th, low 0.15m on 30th ((normal 0.00m to 0.60m)
Mean river temperature 09Z 6.5, high 8.2 on 15th, low 3.7 on 31st
Copley Met O site 257metres asl
Temperature °C (09Z-09Z)
Mean maximum 7.1 (1.4) High 13.1 on 9th, Low 4.1 on 30th
Mean minimum 2.6 (2.0) Low -4.4 on 31st, High 6.9 on 15th
Mean screen 4.9 (1.7)
Mean grass minimum -0.5 (1.8) Low -10.4 on 31st
Mean concrete minimum 1.9 (2.2) Low -4.2 on 31st
Mean 30cm earth 6.6 (1.5)
Mean 100cm earth 7.6 (1.0)
Air frost 5 (-8) 15.0 hours
Ground frost 14 (-9)
Concrete frost 8 (-9)
Precipitation mm (09Z-09Z)
Total 88.6 (102%) High 11.8 on 15th
Days 0.2mm 22 (2)
Days 1.0mm 14 (-1)
Hail 0 (-1)
Thunder 0 (0)
Snow cm
Days falling 4 (-7)
Days lying 50% 09Z, 0 (-7) snow on ground 0
Fresh falls 09Z 0cm (-14cm)
Max depth 09Z 0cm on 0th
Sunshine hr (R&D electronic recorder) Sunshine hr (Campbell Stokes)
Total 43.6(62%) 35.4(66%)
Max day 6.1 on 2nd 5.2 on 8th
Average daily 1.4 (19% of the possible 7.3hr / day) 1.1 (15% possible)
Days no sun 16 (7) 17 (6)
Fog (Vis <1km 09Z), 4 (0)
Pressure mb (mean sea level)
Average 09Z 1012.6 (0.1)
High 24hr 1041.1 on 27th
Low 24hr 985.0 on 6th
Wind KT (Davis recorder)
Mean SW 8.1 (-2.7) High gust 52 on 10th
Gale days 1 (-1)
Ken Cook, Copley, Teesdale / Weardale watershed