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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 21, Sunday | 14 | -2.5 28 | 681.1 26.81 908.06 908.06 | 770.0 30.31 1026.58 1026.58 | 0.6 0.02 0.8 0.8 | 84 | Calm, no wind | Calm | 100%. 10/10. 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. | 40%. 4/10. 3 oktas | 2500 or more, or no clouds. 8202 or more, or no clouds. | Altocumulus translucidus at a single level. | Cirrus spissatus, in patches or entangled sheaves, which usually do not increase and sometimes seem to be the remains of the upper part of a Cumulonimbus; or Cirrus castellanus or floccus. | 20.0 12.4 | -4.9 23 | ||||||||||
11 | -4.2 24 | 680.5 26.79 907.26 907.26 | 769.9 30.31 1026.45 1026.45 | 1.5 0.06 2 2 | 91 | Wind blowing from the north-west | Light air (1 m/s) (4 km/h) (2 mph) (2 knots) (1 Bft) | 100%. 10/10. 8 oktas | Continuous fall of snowflakes, moderate at time of observation. | Shower(s). | Snow and/or other types of solid precipitation | -3.7 25 | No Stratocumulus, Stratus, Cumulus or Cumulonimbus. | 100%. 10/10. 8 oktas | 600-1000 1968-3281 | Altostratus opacus or Nimbostratus. | 2.0 1.2 | -5.4 22 | 3.0 0.12 | 12 | |||||||||
08 | -2.5 28 | 679.0 26.73 905.26 905.26 | 767.6 30.22 1023.38 1023.38 | 1.9 0.07 2.53 2.53 | 96 | Calm, no wind | Calm | 100%. 10/10. 8 oktas | Continuous fall of snowflakes, moderate at time of observation. | Shower(s). | Snow and/or other types of solid precipitation | 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. | 2.0 1.2 | -3.1 26 | 3.0 0.12 | 12 | Even layer of loose dry snow covering ground completely. | 19 7.5 | ||||||||
05 | -3.5 26 | 677.1 26.66 902.73 902.73 | 765.9 30.15 1021.12 1021.12 | 0.5 0.02 0.67 0.67 | 94 | Wind blowing from the east-southeast | Light air (1 m/s) (4 km/h) (2 mph) (2 knots) (1 Bft) | 5 m/s 18 km/h 11 miles/hour 10 knots 3 Bft | 100%. 10/10. 8 oktas | Snow shower(s), moderate or heavy. | Shower(s). | Cloud covering more than 1/2 of the sky throughout the appropriate period. | Cumulonimbus capillatus (often with an anvil), with or without Cumulonimbus calvus, Cumulus, Stratocumulus, Stratus or pannus. | 60%. 6/10. 5 oktas | 600-1000 1968-3281 | 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. | -4.3 24 | ||||||||||||
02 | -1.8 29 | 676.6 26.64 902.06 902.06 | 764.7 30.11 1019.52 1019.52 | 0.9 0.04 1.2 1.2 | 75 | Calm, no wind | Calm | 100%. 10/10. 8 oktas | Cumulonimbus capillatus (often with an anvil), with or without Cumulonimbus calvus, Cumulus, Stratocumulus, Stratus or pannus. | 40%. 4/10. 3 oktas | 1000-1500 3281-4921 | 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. | -5.7 22 | ||||||||||||||||
| December 20, Saturday | 23 | -3.3 26 | 675.7 26.6 900.86 900.86 | 764.3 30.09 1018.98 1018.98 | 0.4 0.02 0.53 0.53 | 74 | Wind blowing from the south-east | Light air (1 m/s) (4 km/h) (2 mph) (2 knots) (1 Bft) | 100%. 10/10. 8 oktas | 5.0 41 | No Stratocumulus, Stratus, Cumulus or Cumulonimbus. | 100%. 10/10. 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. | -7.3 19 | ||||||||||||||
20 | -2.9 27 | 675.3 26.59 900.33 900.33 | 763.6 30.06 1018.05 1018.05 | 0.5 0.02 0.67 0.67 | 69 | Wind blowing from the east-southeast | Light air (1 m/s) (4 km/h) (2 mph) (2 knots) (1 Bft) | 100%. 10/10. 8 oktas | 5.0 41 | No Stratocumulus, Stratus, Cumulus or Cumulonimbus. | 100%. 10/10. 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. | -7.9 18 | |||||||||||||||
17 | -1.7 29 | 674.8 26.57 899.66 899.66 | 762.6 30.02 1016.72 1016.72 | 0.1 0 0.13 0.13 | 64 | Calm, no wind | Calm | 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. | 40%. 4/10. 3 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. | Cirrus (often in bands) and Cirrostratus, or Cirrostratus alone, progressively invading the sky; they generally thicken as a whole, but the continuous veil does not reach 45 degrees above the horizon. | -7.7 18 | |||||||||||||||
14 | 3.2 38 | 674.7 26.56 899.53 899.53 | 760.9 29.96 1014.45 1014.45 | -0.9 -0.04 -1.2 -1.2 | 40 | Calm, no wind | Calm | 100%. 10/10. 8 oktas | No Stratocumulus, Stratus, Cumulus or Cumulonimbus. | 100%. 10/10. 8 oktas | 2500 or more, or no clouds. 8202 or more, or no clouds. | Altostratus translucidus. | 20.0 12.4 | -9.3 15 | |||||||||||||||