@daanvandenbroek.com
Researcher @ Finnish Meteorological Institute Freelance Writer MSc in Atmospheric Sciences, University of Helsinki www.daanvandenbroek.com Main interests: Meteorology | Climate | Polar Regions | Nature | Energy Transition Opinions & views are my own
Office for the next 2 weeks - not bad!
Winter school at Tvärminne zoological station. Learning about the marine and coastal environment and its interactions with the atmosphere.
In any case, a memorable winter, for current climatological standards!
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The streak of consecutive ice-days was also the largest since 2011, with an unfortunate break of the streak in mid January, when temperatures reached a few decimals above 0°C.
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This is in a large part due to the extremely warm December (the 7th warmest on record at +2.5°C).
January (-7.4°C) and February (-8.5°C) were more 'properly cold'.
February 'benefited' from an almost fully frozen Gulf of Finland.
The attached post shows the peak sea ice extent in late February.
The average temperature in Helsinki this winter. The winter of 2025-2026 is highlighted in a red circle. The red line indicates the trend since the 1880's.
Winter '26 mean temperature: -4.4°C
The past winter (dec-feb) in Helsinki was the coldest since 2010-2011 (-7.2°C).
The coldest winter since I moved to Finland, but in historical terms, this winter was far from exceptional.
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🤯
When was this nation-wide record, well below -30C in January? 1987?
Daily average temperature in Finland in 2026, based on FMI ClimGrid data. The values have been consistently below normal, except for 5-day period in mid-January.
The Finnish area mean temperature has stayed below normal now for 33 straight days.
The weather has remained consistently cold during 2026, except for the brief 5-day period in mid-January.
Exactly, and only marginally so, I believe the maximum temperature was only +0.4C.
If it wasn’t for those two days, it would have been a truly remarkable streak.
Bye winter…
the disgusting melting phase has begun.
What snow + a thick layer of freezing rain looks like👇🏼
Yesterday evening, just before it started thawing.
Longest streak of ice days (days with maximum temperature below 0°C) for each winter year at the Helsinki Kaisaniemi weather station.
Today, after 37 days, the temperature will rise above 0°C again in Helsinki. 🌡️📈
This is the longest continuous streak of frost since the winter of 2009-2010 (59 days).
Went for a walk along and over the sea ice at Porkkalaniemi yesterday.
If it wasn’t for the forested coastline, it could’ve been the Arctic Ocean.
Wonderful day with the sun and blowing snow! ☀️❄️
Walking on the Gulf of Finland last night.
More about the extreme cold in the beginning of this year in the thread below 👇
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Time series of average January temperature (°C) in Karesuando, Sweden, based on data from the Norwegian Meteorological Institute. Each point shows the mean temperature for January in a given year (1878–2026). The coldest January on record occurred in 1893 (−25.0 °C), highlighted with a red circle. The most recent January (2026) averaged −22.4 °C, also highlighted.
In Karesuando 🇸🇪, January 2026 was the coldest since 1893!
The average January temperature was -22.4°C, well above the 1893 record (-25.0°C).
Once again goes to show the abnormally cold weather in northern Fennoscandia last month.
Two days narrowly above 0°C mid-January prevented an even more remarkable frost streak starting December 30th (49 days).
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Few would've guessed after such a mild December, but this winter in Helsinki is turning out to be quite a 'special one' under current climatological standards.
It has been freezing 'permanently' for 29 days.
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Currently (counting today), we're at 29 consecutive ice days at Helsinki Kaisaniemi.
Based on today's 00z runs, I suspect the streak might be broken early next week, likely giving us the longest such streak since 2011.
If it wasn't for those 2-3 days mid January...
It certainly is! Stay tuned for the winter statistics at the end of this month 😉
Another very cold morning in southern Finland.
Exactly 🎯
Climate “skeptics” (almost always also ‘skeptical’ of EVs or any kind of renewables/sustainable development -“coincidentally”) are never actually skeptical.
They’re either gullible, deceptive, or both - and unwilling to change preconceptions they hold bc of certain political beliefs.
13-month graph of daily, weekly and monthly values, showing the seasonal swing on top of the upward trend.
The January average of atmospheric CO2 at Mauna Loa was 428.6 ppm; that's 2.0 ppm higher than last year, fortunately not as fast a growth rate as we've often seen in recent years.
Also, climate ‘skeptics’ continuously told me that electric vehicles don’t work in the cold…
Yet, we drove hundreds of kms throughout Lapland in these kind of temperatures, without a problem.
Nice to see the consistent temperature inversion driving from Muonio (at the foot of the hill) to Olos, on the hill, where we’re currently staying. 🤓
This evening: -26°C in Muonio, -19°C in Olos.
Horizontal distance, 4km. Elevation difference: ~140 m
Tuore raportti AMOC-kiertoliikkeen keikahduspisteen vaikutuksista kehottaa tehostamaan ilmastonmuutoksen hillitsemistä, seurantaa ja varautumista.
Raporttiin on koostettu tieteellinen tieto AMOCin mahdollisen romahduksen vaikutuksista Pohjoismaissa.
www.ilmatieteenlaitos.fi/tiedote/6TWT...
Pleased to have contributed as an author to this analysis of impacts and policy responses to a potential AMOC tipping point from a Nordic perspective!
pub.norden.org/temanord2026...
Presented today.
The report “A Nordic Perspective on AMOC Tipping” reviews the current state of science on the impacts of potential Atlantic Meridional Overturning Circulation (AMOC) collapse and provides recommendations for policy actions.
pub.norden.org/temanord2026...
The report follows from the Nordic Tipping week, an AMOC workshop funded by the Nordic council of ministers.
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The report calls for:
✅ faster emissions cuts
✅ better monitoring & early warnings
✅ preparedness planning, including planning for multiple possible futures
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