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Temperature: what to define before logging starts
Location, sampling interval and data access: three decisions to prepare a temperature measurement campaign.
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Measurement notes
Guides to choosing instruments and preparing data collection, based on applications in the catalogue.
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How long does biofouling take to spoil a conductivity record? What a study with moored sensors in the Baltic measured
In a study off the southern Baltic coast, a conductivity sensor moored at 2 m with a used TBT cell was out of specification at the first comparison after deployment, on day 32; with a UVC emitter, the last references, after 237 days, were within the margin. What this changes when planning visits and references.
Changing site or instrument without breaking the record: lessons from the Montseny summit series (1950-2025)
On 31 October 2026 AEMET and the SMC published an analysis of the Montseny summit series, which joins two sites and fills the gaps from 2001 to 2010. What it teaches anyone planning to move a station or change a sensor.
Monitoring the climate of a museum or church: how often to log, for how long and at how many points
One hour or less between readings, at least 13 months of data to apply the EN 15757 standard, and a first campaign with many points before deciding how many loggers to keep. These are the decisions supported by two studies in Valencia museums and a US National Park Service guide.
Week of 2 to 8 November 2026: possible frosts inland in the north and rain on the Mediterranean. What to measure and with what care
AEMET expects a week that will probably be warmer than normal in southern Spain, with possible night frosts inland in the north and the heaviest rain in the Mediterranean area and the Balearics. Four official signals, including the new regionalised seasonal forecasts, and what to measure with each.
Week in review, 26 to 30 October 2026: what to note down alongside the data
The week's four articles (the logger's clock, the vaccine refrigerator, the European climate resilience law and replacing a humidity sensor), three signals with their sources (the Commission's new tools, the WMO greenhouse gas bulletin and climate indicators for tourism in southern Catalonia) and what comes next: COP31 from 9 November.
Replacing a humidity sensor can leave a mark in the record: what a study of 55 UK stations found
A study of 55 UK stations detected changes in measurement technique in humidity records; at one station, smaller detections were linked to routine sensor replacements. What it allows you to conclude, what it does not, and what to log in your own record.
The Commission proposes a common warming trajectory for climate risk assessments: what to measure at your site to read it
On 27 October 2026 the European Commission proposed the European Climate Resilience Law, with a reference global warming trajectory and periodic risk assessments. What that information describes, what it does not describe about your site and what is worth recording.
Is it really between 2 and 8 °C? Where to put the probe in a vaccine refrigerator and what to log
In a German study of 75 vaccine refrigerators, only 24 stayed between 2 and 8 °C over seven days of logging. How to decide where the probe goes, whether it sits in air or in a buffer, how often to log and who reviews the data, drawing on guidance from Madrid and the Basque Country.
Week of 26 October to 1 November 2026: settled weather, little rain and the clocks just changed. What to measure and how carefully
AEMET expects a settled week with temperatures high for the time of year and scant rain, and more uncertainty from 2 November. Four signals and what to check in your series, starting with the time: on Sunday 25 October, official time in mainland Spain and the Balearic Islands went from UTC+2 to UTC+1.