Sea of fog calendar
Most often in December: a sea of fog on 52 of 186 measured days.
Counted, not estimated: the days on which MeteoSwiss' SwissMetNet stations measured a sea of fog, month by month – and how often the summits stood above the fog lid.
Measured from 2020-01-01 to 2026-11-08 · Source: MeteoSwiss, SwissMetNet stations
Days with a sea of fog per month · 2020–2026
A sea of fog on 186 of 2,504 measured days
Each bar counts the days of a month on which the stations measured a sea of fog – all measured years together. The month with the largest share is highlighted.
Latest measured
Summit by summit: days above the sea of fog
How often a summit stood at least 100 m above the day's highest fog lid on a day with a sea of fog – per month, all measured years together.
Every day with a sea of fog
Each day with its fog report: the fog lid, the sun at every station and the summits above it.
January: 37
- Sat, 2026-01-31Fog lid 900–1,100 m · 29 of 44 Plateau stations without sun
- Sat, 2026-01-24Fog lid 1,800–2,000 m · 26 of 44 Plateau stations without sun
- Fri, 2026-01-23Fog lid 1,300–2,000 m · 16 of 44 Plateau stations without sun
- Thu, 2026-01-22Fog lid 2,000–2,100 m · 12 of 44 Plateau stations without sun
- Tue, 2026-01-20Fog lid 600 m · 11 of 44 Plateau stations without sun
- Mon, 2026-01-19Fog lid 600–1,100 m · 25 of 44 Plateau stations without sun
- Sun, 2026-01-18Fog lid 800–1,900 m · 33 of 44 Plateau stations without sun
- Sun, 2026-01-11Fog lid 2,000 m · 9 of 44 Plateau stations without sun
- Tue, 2026-01-06Fog lid 1,600–2,200 m · 5 of 44 Plateau stations without sun
- Tue, 2025-01-21Fog lid 700–1,100 m · 26 of 44 Plateau stations without sun
- Mon, 2025-01-20Fog lid 800–1,400 m · 20 of 44 Plateau stations without sun
- Sun, 2025-01-19Fog lid 900–1,400 m · 20 of 44 Plateau stations without sun
- Sat, 2025-01-18Fog lid 900–1,100 m · 18 of 44 Plateau stations without sun
- Fri, 2025-01-17Fog lid 1,200 m · 25 of 44 Plateau stations without sun
- Thu, 2025-01-16Fog lid 1,300–1,600 m · 15 of 44 Plateau stations without sun
- Tue, 2025-01-07Fog lid 2,100–2,200 m · 0 of 44 Plateau stations without sun
- Sat, 2024-01-13Fog lid 900–1,100 m · 33 of 44 Plateau stations without sun
- Fri, 2024-01-12Fog lid 1,100 m · 25 of 44 Plateau stations without sun
- Thu, 2024-01-11Fog lid 1,100–1,200 m · 40 of 44 Plateau stations without sun
- Wed, 2024-01-10Fog lid 2,000 m · 31 of 44 Plateau stations without sun
- Tue, 2024-01-09Fog lid 2,000 m · 44 of 44 Plateau stations without sun
- Wed, 2024-01-03Fog lid 2,000 m · 0 of 44 Plateau stations without sun
- Sun, 2023-01-29Fog lid 1,500 m · 31 of 43 Plateau stations without sun
- Sat, 2023-01-28Fog lid 2,200 m · 33 of 43 Plateau stations without sun
- Fri, 2023-01-27Fog lid 1,500–2,200 m · 39 of 43 Plateau stations without sun
- Thu, 2023-01-26Fog lid 1,500 m · 43 of 43 Plateau stations without sun
- Wed, 2023-01-25Fog lid 1,400–1,500 m · 40 of 43 Plateau stations without sun
- Tue, 2023-01-24Fog lid 1,600–1,800 m · 31 of 43 Plateau stations without sun
- Sun, 2023-01-22Fog lid 2,200 m · 25 of 43 Plateau stations without sun
- Fri, 2023-01-06Fog lid 1,200–1,600 m · 23 of 43 Plateau stations without sun
- Mon, 2022-01-24Fog lid 900 m · 15 of 37 Plateau stations without sun
- Sat, 2021-01-16Fog lid 2,000 m · 24 of 36 Plateau stations without sun
- Tue, 2021-01-05Fog lid 1,500–1,800 m · 37 of 37 Plateau stations without sun
- Thu, 2020-01-23Fog lid 900–1,400 m · 26 of 33 Plateau stations without sun
- Fri, 2020-01-17Fog lid 2,000 m · 2 of 33 Plateau stations without sun
- Thu, 2020-01-02Fog lid 700–1,100 m · 23 of 33 Plateau stations without sun
- Wed, 2020-01-01Fog lid 800–1,100 m · 26 of 33 Plateau stations without sun
February: 15
- Sat, 2026-02-28Fog lid 1,800–2,200 m · 11 of 44 Plateau stations without sun
- Sun, 2026-02-15Fog lid 1,600–2,300 m · 0 of 44 Plateau stations without sun
- Sun, 2026-02-08Fog lid 900–1,800 m · 23 of 44 Plateau stations without sun
- Tue, 2025-02-18Fog lid 1,200–1,300 m · 25 of 44 Plateau stations without sun
- Mon, 2025-02-17Fog lid 1,200–1,300 m · 32 of 44 Plateau stations without sun
- Thu, 2025-02-06Fog lid 1,500–1,600 m · 43 of 44 Plateau stations without sun
- Wed, 2025-02-05Fog lid 800–900 m · 9 of 44 Plateau stations without sun
- Mon, 2025-02-03Fog lid 1,100–1,200 m · 30 of 44 Plateau stations without sun
- Sun, 2025-02-02Fog lid 1,100–1,200 m · 34 of 44 Plateau stations without sun
- Sat, 2025-02-01Fog lid 1,500–1,600 m · 42 of 44 Plateau stations without sun
- Tue, 2023-02-28Fog lid 1,500–2,000 m · 25 of 43 Plateau stations without sun
- Mon, 2023-02-06Fog lid 1,600–1,800 m · 10 of 43 Plateau stations without sun
- Sat, 2021-02-27Fog lid 1,500–1,600 m · 11 of 37 Plateau stations without sun
- Sat, 2021-02-13Fog lid 1,500–1,600 m · 14 of 36 Plateau stations without sun
- Tue, 2021-02-09Fog lid 1,800–2,000 m · 10 of 36 Plateau stations without sun
March: 10
- Fri, 2025-03-28Fog lid 1,800–2,300 m · 0 of 44 Plateau stations without sun
- Thu, 2025-03-27Fog lid 2,000–2,300 m · 3 of 44 Plateau stations without sun
- Sat, 2025-03-01Fog lid 1,600–1,800 m · 13 of 44 Plateau stations without sun
- Thu, 2024-03-07Fog lid 1,500–1,800 m · 19 of 44 Plateau stations without sun
- Mon, 2024-03-04Fog lid 2,200–2,300 m · 8 of 44 Plateau stations without sun
- Mon, 2023-03-06Fog lid 1,500–2,200 m · 9 of 43 Plateau stations without sun
- Fri, 2023-03-03Fog lid 1,100–1,300 m · 1 of 43 Plateau stations without sun
- Wed, 2023-03-01Fog lid 1,600 m · 39 of 43 Plateau stations without sun
- Sat, 2021-03-06Fog lid 1,300–1,500 m · 2 of 37 Plateau stations without sun
- Sun, 2020-03-22Fog lid 1,500–1,800 m · 11 of 33 Plateau stations without sun
April: 3
August: 2
October: 24
- Fri, 2026-10-30Fog lid 1,500 m · 16 of 44 Plateau stations without sun
- Mon, 2026-10-19Fog lid 1,300 m · 34 of 44 Plateau stations without sun
- Sat, 2026-10-17Fog lid 1,800–2,200 m · 31 of 44 Plateau stations without sun
- Sun, 2026-10-11Fog lid 2,200 m · 1 of 44 Plateau stations without sun
- Thu, 2025-10-30Fog lid 1,500–2,200 m · 15 of 44 Plateau stations without sun
- Fri, 2025-10-17Fog lid 1,600 m · 10 of 44 Plateau stations without sun
- Thu, 2025-10-16Fog lid 1,500–1,600 m · 5 of 44 Plateau stations without sun
- Tue, 2025-10-14Fog lid 1,500–1,600 m · 10 of 44 Plateau stations without sun
- Mon, 2025-10-13Fog lid 1,300–1,500 m · 14 of 44 Plateau stations without sun
- Sun, 2025-10-12Fog lid 1,300–1,500 m · 13 of 44 Plateau stations without sun
- Sat, 2025-10-11Fog lid 1,300–1,400 m · 12 of 44 Plateau stations without sun
- Thu, 2025-10-09Fog lid 1,600–1,800 m · 28 of 44 Plateau stations without sun
- Wed, 2025-10-08Fog lid 700–1,000 m · 1 of 44 Plateau stations without sun
- Thu, 2024-10-31Fog lid 900 m · 33 of 44 Plateau stations without sun
- Wed, 2024-10-30Fog lid 700–800 m · 25 of 44 Plateau stations without sun
- Tue, 2024-10-29Fog lid 700 m · 14 of 44 Plateau stations without sun
- Sat, 2024-10-26Fog lid 900–1,100 m · 33 of 44 Plateau stations without sun
- Fri, 2024-10-25Fog lid 800–1,200 m · 14 of 44 Plateau stations without sun
- Sat, 2024-10-05Fog lid 2,200 m · 1 of 44 Plateau stations without sun
- Wed, 2022-10-12Fog lid 1,300–1,500 m · 16 of 38 Plateau stations without sun
- Thu, 2021-10-28Fog lid 600–700 m · 0 of 37 Plateau stations without sun
- Sat, 2021-10-09Fog lid 1,500–1,800 m · 4 of 37 Plateau stations without sun
- Fri, 2021-10-08Fog lid 1,800 m · 1 of 37 Plateau stations without sun
- Sat, 2020-10-31Fog lid 600–700 m · 9 of 36 Plateau stations without sun
November: 42
- Thu, 2026-11-05Fog lid 900–2,200 m · 15 of 44 Plateau stations without sun
- Wed, 2026-11-04Fog lid 1,500 m · 39 of 43 Plateau stations without sun
- Tue, 2026-11-03Fog lid 1,800 m · 39 of 44 Plateau stations without sun
- Mon, 2026-11-02Fog lid 1,500–1,800 m · 16 of 44 Plateau stations without sun
- Sat, 2025-11-08Fog lid 600–1,400 m · 23 of 44 Plateau stations without sun
- Fri, 2025-11-07Fog lid 700–1,400 m · 18 of 44 Plateau stations without sun
- Sat, 2024-11-30Fog lid 900–1,100 m · 26 of 44 Plateau stations without sun
- Wed, 2024-11-13Fog lid 1,500–2,200 m · 38 of 44 Plateau stations without sun
- Tue, 2024-11-12Fog lid 1,800–2,200 m · 35 of 44 Plateau stations without sun
- Mon, 2024-11-11Fog lid 1,000–1,400 m · 14 of 44 Plateau stations without sun
- Sun, 2024-11-10Fog lid 900–1,400 m · 32 of 44 Plateau stations without sun
- Sat, 2024-11-09Fog lid 800–1,400 m · 27 of 44 Plateau stations without sun
- Fri, 2024-11-08Fog lid 900–1,400 m · 10 of 44 Plateau stations without sun
- Thu, 2024-11-07Fog lid 1,300–1,400 m · 31 of 44 Plateau stations without sun
- Tue, 2024-11-05Fog lid 700–1,400 m · 8 of 44 Plateau stations without sun
- Mon, 2024-11-04Fog lid 900–1,400 m · 27 of 44 Plateau stations without sun
- Sun, 2024-11-03Fog lid 1,000–1,100 m · 25 of 44 Plateau stations without sun
- Sat, 2024-11-02Fog lid 900–1,200 m · 29 of 44 Plateau stations without sun
- Wed, 2023-11-22Fog lid 2,000–2,100 m · 22 of 44 Plateau stations without sun
- Sun, 2022-11-13Fog lid 900–2,000 m · 29 of 38 Plateau stations without sun
- Sat, 2022-11-12Fog lid 900–1,400 m · 25 of 38 Plateau stations without sun
- Wed, 2021-11-24Fog lid 1,200 m · 30 of 37 Plateau stations without sun
- Tue, 2021-11-23Fog lid 1,600–1,800 m · 32 of 37 Plateau stations without sun
- Sat, 2021-11-20Fog lid 900 m · 28 of 37 Plateau stations without sun
- Fri, 2021-11-19Fog lid 700–800 m · 18 of 37 Plateau stations without sun
- Tue, 2021-11-16Fog lid 1,300–1,500 m · 37 of 37 Plateau stations without sun
- Fri, 2021-11-12Fog lid 700–1,400 m · 20 of 37 Plateau stations without sun
- Thu, 2021-11-11Fog lid 600–1,400 m · 0 of 37 Plateau stations without sun
- Mon, 2021-11-08Fog lid 1,600–1,800 m · 2 of 37 Plateau stations without sun
- Mon, 2020-11-30Fog lid 1,300 m · 31 of 36 Plateau stations without sun
- Sun, 2020-11-29Fog lid 1,500 m · 35 of 36 Plateau stations without sun
- Sat, 2020-11-28Fog lid 900–1,100 m · 23 of 36 Plateau stations without sun
- Fri, 2020-11-27Fog lid 700–1,100 m · 25 of 36 Plateau stations without sun
- Thu, 2020-11-26Fog lid 700–1,100 m · 20 of 36 Plateau stations without sun
- Wed, 2020-11-25Fog lid 900–1,100 m · 25 of 36 Plateau stations without sun
- Tue, 2020-11-24Fog lid 900–1,100 m · 19 of 36 Plateau stations without sun
- Wed, 2020-11-11Fog lid 1,200–1,400 m · 20 of 36 Plateau stations without sun
- Tue, 2020-11-10Fog lid 600–1,500 m · 18 of 36 Plateau stations without sun
- Mon, 2020-11-09Fog lid 500–700 m · 4 of 36 Plateau stations without sun
- Sat, 2020-11-07Fog lid 800–1,400 m · 12 of 36 Plateau stations without sun
- Fri, 2020-11-06Fog lid 1,200–1,400 m · 10 of 36 Plateau stations without sun
- Thu, 2020-11-05Fog lid 1,600 m · 28 of 36 Plateau stations without sun
December: 52
- Tue, 2025-12-30Fog lid 1,500 m · 8 of 44 Plateau stations without sun
- Mon, 2025-12-29Fog lid 900–1,100 m · 31 of 44 Plateau stations without sun
- Sat, 2025-12-27Fog lid 1,000–1,100 m · 36 of 44 Plateau stations without sun
- Fri, 2025-12-26Fog lid 1,000–1,100 m · 38 of 44 Plateau stations without sun
- Thu, 2025-12-25Fog lid 1,300 m · 37 of 44 Plateau stations without sun
- Sun, 2025-12-21Fog lid 1,000–1,200 m · 27 of 44 Plateau stations without sun
- Thu, 2025-12-18Fog lid 600 m · 12 of 44 Plateau stations without sun
- Mon, 2025-12-15Fog lid 800–1,400 m · 32 of 44 Plateau stations without sun
- Sun, 2025-12-14Fog lid 900–1,100 m · 35 of 44 Plateau stations without sun
- Sat, 2025-12-13Fog lid 800–1,100 m · 32 of 44 Plateau stations without sun
- Fri, 2025-12-12Fog lid 800–1,100 m · 21 of 44 Plateau stations without sun
- Wed, 2025-12-10Fog lid 1,800–2,200 m · 3 of 44 Plateau stations without sun
- Tue, 2025-12-09Fog lid 700 m · 12 of 44 Plateau stations without sun
- Sat, 2025-12-06Fog lid 2,000–2,200 m · 29 of 44 Plateau stations without sun
- Fri, 2025-12-05Fog lid 1,800–2,000 m · 27 of 44 Plateau stations without sun
- Thu, 2025-12-04Fog lid 1,400–1,600 m · 28 of 44 Plateau stations without sun
- Wed, 2025-12-03Fog lid 2,000 m · 33 of 44 Plateau stations without sun
- Mon, 2025-12-01Fog lid 1,300–1,700 m · 39 of 44 Plateau stations without sun
- Tue, 2024-12-31Fog lid 700–1,100 m · 18 of 44 Plateau stations without sun
- Mon, 2024-12-30Fog lid 900–1,100 m · 31 of 44 Plateau stations without sun
- Sun, 2024-12-29Fog lid 700–1,100 m · 25 of 44 Plateau stations without sun
- Sat, 2024-12-28Fog lid 900–1,100 m · 32 of 44 Plateau stations without sun
- Fri, 2024-12-27Fog lid 900–1,100 m · 35 of 44 Plateau stations without sun
- Fri, 2024-12-13Fog lid 900–1,800 m · 28 of 44 Plateau stations without sun
- Thu, 2024-12-12Fog lid 1,300 m · 36 of 44 Plateau stations without sun
- Wed, 2024-12-11Fog lid 1,600 m · 39 of 44 Plateau stations without sun
- Tue, 2024-12-10Fog lid 2,000 m · 37 of 44 Plateau stations without sun
- Thu, 2024-12-05Fog lid 1,800–2,200 m · 6 of 44 Plateau stations without sun
- Sun, 2024-12-01Fog lid 900–1,100 m · 1 of 44 Plateau stations without sun
- Mon, 2023-12-18Fog lid 700–1,100 m · 26 of 44 Plateau stations without sun
- Sun, 2023-12-17Fog lid 800–1,100 m · 34 of 44 Plateau stations without sun
- Sun, 2022-12-25Fog lid 1,200–1,900 m · 24 of 43 Plateau stations without sun
- Sun, 2022-12-18Fog lid 900–1,100 m · 23 of 43 Plateau stations without sun
- Sat, 2022-12-17Fog lid 1,300 m · 29 of 43 Plateau stations without sun
- Mon, 2022-12-12Fog lid 1,000–1,600 m · 23 of 43 Plateau stations without sun
- Wed, 2022-12-07Fog lid 1,600–1,800 m · 26 of 42 Plateau stations without sun
- Fri, 2022-12-02Fog lid 1,800–2,000 m · 21 of 42 Plateau stations without sun
- Thu, 2022-12-01Fog lid 2,200 m · 37 of 42 Plateau stations without sun
- Wed, 2021-12-22Fog lid 900–1,200 m · 27 of 37 Plateau stations without sun
- Tue, 2021-12-21Fog lid 1,300 m · 29 of 37 Plateau stations without sun
- Mon, 2021-12-20Fog lid 1,200 m · 9 of 37 Plateau stations without sun
- Sun, 2021-12-19Fog lid 700–1,100 m · 26 of 37 Plateau stations without sun
- Fri, 2021-12-17Fog lid 1,200–1,300 m · 32 of 37 Plateau stations without sun
- Thu, 2021-12-16Fog lid 1,200 m · 32 of 37 Plateau stations without sun
- Wed, 2021-12-15Fog lid 900–1,100 m · 27 of 37 Plateau stations without sun
- Tue, 2021-12-14Fog lid 800–2,200 m · 21 of 37 Plateau stations without sun
- Sat, 2020-12-19Fog lid 1,800–2,000 m · 23 of 37 Plateau stations without sun
- Thu, 2020-12-17Fog lid 2,000 m · 5 of 37 Plateau stations without sun
- Wed, 2020-12-16Fog lid 1,100–1,800 m · 18 of 37 Plateau stations without sun
- Sun, 2020-12-13Fog lid 1,800–2,000 m · 8 of 36 Plateau stations without sun
- Thu, 2020-12-10Fog lid 1,300–2,000 m · 26 of 36 Plateau stations without sun
- Tue, 2020-12-08Fog lid 1,200–1,800 m · 19 of 36 Plateau stations without sun
How it is counted
Every MeteoSwiss station measures how many minutes of each hour the sun shines. When the low stations see hardly any sun and higher ones plenty, a sea of fog lies in between; its lid lies between the highest station in fog and the lowest in the sun.
A day with a sea of fog has one in at least half of its hours with the sun high, measured north of the main Alpine ridge. A summit counts when it stands 100 m above the day's highest lid. Nothing is modelled: every figure counts measured days, and every new day is added.
Source: MeteoSwiss