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| Date / Local time | T | Po | P | Pa | U | DD | Ff | ff10 | ff3 | N | WW | W1 | W2 | Tn | Tx | Cl | Nh | H | Cm | Ch | VV | Td | RRR | tR | E | Tg | E' | sss | |
| 2025 December 18, Thursday | 23 | -10.9 12 | 668.4 26.31 891.13 891.13 | 754.0 29.69 1005.25 1005.25 | 1.1 0.04 1.47 1.47 | 81 | Wind blowing from the west-northwest | Gentle breeze (4 m/s) (14 km/h) (9 miles/hour) (8 knots) (3 Bft) | 20–30%. 2/10–3/10. 2 oktas | No Stratocumulus, Stratus, Cumulus or Cumulonimbus. | no clouds no clouds no clouds | 2500 or more, or no clouds. 8202 or more, or no clouds. | No Altocumulus, Altostratus or Nimbostratus. | Cirrus uncinus or fibratus, or both, progressively invading the sky; they generally thicken as a whole. | -13.5 8 | ||||||||||||||
20 | -11.9 11 | 667.3 26.27 889.66 889.66 | 753.2 29.65 1004.18 1004.18 | -0.3 -0.01 -0.4 -0.4 | 83 | Wind blowing from the west | Fresh breeze (8 m/s) (29 km/h) (18 miles/hour) (16 knots) (5 Bft) | 40%. 4/10. 3 oktas | Clouds generally dissolving or becoming less developed. | Snow and/or other types of solid precipitation | Cloud covering more than 1/2 of the sky during part of the appropriate period and covering 1/2 or less during part of the period. | -8.8 16 | No Stratocumulus, Stratus, Cumulus or Cumulonimbus. | 10% or less, but not 0 1/10 or less, but not zero 1 okta or less, but not 0 | 2500 or more, or no clouds. 8202 or more, or no clouds. | Patches (often lenticular) of Altocumulus translucidus, continually changing and occurring at one or more levels. | Cirrus uncinus or fibratus, or both, progressively invading the sky; they generally thicken as a whole. | -14.2 6 | 0.3 0.01 | 12 | |||||||||
17 | -11.6 11 | 667.6 26.28 890.06 890.06 | 753.4 29.66 1004.45 1004.45 | -0.9 -0.04 -1.2 -1.2 | 83 | Wind blowing from the west | Light breeze (2 m/s) (7 km/h) (4 mph) (4 knots) (2 Bft) | 90 or more, but not 100% 9/10 or more, but not 10/10 7 oktas or more, but not 8 oktas | State of sky on the whole unchanged. | Snow and/or other types of solid precipitation | Cloud covering more than 1/2 of the sky throughout the appropriate period. | No Stratocumulus, Stratus, Cumulus or Cumulonimbus. | 60%. 6/10. 5 oktas | 2500 or more, or no clouds. 8202 or more, or no clouds. | Altocumulus translucidus or opacus in two or more layers, or Altocumulus opacus in a single layer, not progressively invading the sky, or Altocumulus with Altostratus or Nimbostratus. | Cirrostratus not progressively invading the sky and not entirely covering it. | 50.0 31.1 | -13.9 7 | |||||||||||
14 | -9.9 14 | 668.5 26.32 891.26 891.26 | 753.9 29.68 1005.12 1005.12 | -2.8 -0.11 -3.73 -3.73 | 83 | Wind blowing from the north | Light breeze (2 m/s) (7 km/h) (4 mph) (4 knots) (2 Bft) | 100%. 10/10. 8 oktas | Continuous fall of snowflakes, slight at time of observation. | Snow and/or other types of solid precipitation | Cloud covering more than 1/2 of the sky throughout the appropriate period. | No Stratocumulus, Stratus, Cumulus or Cumulonimbus. | 100%. 10/10. 8 oktas | 2500 or more, or no clouds. 8202 or more, or no clouds. | Altostratus opacus or Nimbostratus. | 10.0 6.2 | -12.2 10 | ||||||||||||
11 | -12.8 9 | 671.3 26.43 894.99 894.99 | 758.1 29.85 1010.72 1010.72 | -2.7 -0.11 -3.6 -3.6 | 83 | Wind blowing from the north-east | Gentle breeze (4 m/s) (14 km/h) (9 miles/hour) (8 knots) (3 Bft) | 90 or more, but not 100% 9/10 or more, but not 10/10 7 oktas or more, but not 8 oktas | No Stratocumulus, Stratus, Cumulus or Cumulonimbus. | 90 or more, but not 100% 9/10 or more, but not 10/10 7 oktas or more, but not 8 oktas | 2500 or more, or no clouds. 8202 or more, or no clouds. | Altostratus translucidus. | No Cirrus, Cirrocumulus or Cirrostratus. | 50.0 31.1 | -15.1 5 | ||||||||||||||
08 | -17.2 1 | 674.0 26.54 898.59 898.59 | 762.7 30.03 1016.85 1016.85 | -2.0 -0.08 -2.67 -2.67 | 85 | Wind blowing from the north-east | Light air (1 m/s) (4 km/h) (2 mph) (2 knots) (1 Bft) | 90 or more, but not 100% 9/10 or more, but not 10/10 7 oktas or more, but not 8 oktas | -18.9 -2 | No Stratocumulus, Stratus, Cumulus or Cumulonimbus. | 90 or more, but not 100% 9/10 or more, but not 10/10 7 oktas or more, but not 8 oktas | 2500 or more, or no clouds. 8202 or more, or no clouds. | Altocumulus translucidus or opacus in two or more layers, or Altocumulus opacus in a single layer, not progressively invading the sky, or Altocumulus with Altostratus or Nimbostratus. | No Cirrus, Cirrocumulus or Cirrostratus. | 50.0 31.1 | -19.2 -3 | Uneven layer of compact or wet snow covering ground completely. | 3 1.2 | |||||||||||
05 | -17.3 1 | 676.0 26.61 901.26 901.26 | 764.8 30.11 1019.65 1019.65 | -2.2 -0.09 -2.93 -2.93 | 81 | Wind blowing from the west | Light breeze (3 m/s) (11 km/h) (7 miles/hour) (6 knots) (2 Bft) | 50%. 5/10. 4 oktas | No Stratocumulus, Stratus, Cumulus or Cumulonimbus. | 50%. 5/10. 4 oktas | 2500 or more, or no clouds. 8202 or more, or no clouds. | Altocumulus translucidus or opacus in two or more layers, or Altocumulus opacus in a single layer, not progressively invading the sky, or Altocumulus with Altostratus or Nimbostratus. | No Cirrus, Cirrocumulus or Cirrostratus. | -19.8 -4 | |||||||||||||||
02 | -18.8 -2 | 678.2 26.7 904.19 904.19 | 768.1 30.24 1024.05 1024.05 | -1.0 -0.04 -1.33 -1.33 | 82 | Wind blowing from the west | Gentle breeze (4 m/s) (14 km/h) (9 miles/hour) (8 knots) (3 Bft) | 20–30%. 2/10–3/10. 2 oktas | No Stratocumulus, Stratus, Cumulus or Cumulonimbus. | 20–30%. 2/10–3/10. 2 oktas | 2500 or more, or no clouds. 8202 or more, or no clouds. | Patches (often lenticular) of Altocumulus translucidus, continually changing and occurring at one or more levels. | No Cirrus, Cirrocumulus or Cirrostratus. | -21.2 -6 | |||||||||||||||
| December 17, Wednesday | 23 | -13.7 7 | 679.2 26.74 905.53 905.53 | 767.2 30.2 1022.85 1022.85 | -1.0 -0.04 -1.33 -1.33 | 79 | Wind blowing from the west-northwest | Moderate breeze (6 m/s) (22 km/h) (13 miles/hour) (12 knots) (4 Bft) | 40%. 4/10. 3 oktas | No Stratocumulus, Stratus, Cumulus or Cumulonimbus. | 20–30%. 2/10–3/10. 2 oktas | 2500 or more, or no clouds. 8202 or more, or no clouds. | Altocumulus translucidus at a single level. | Cirrus uncinus or fibratus, or both, progressively invading the sky; they generally thicken as a whole. | -16.6 2 | ||||||||||||||