Weather Metric is a free UK weather tool for people running building sites, on the web and on iPhone. It has no account and no sign-in, it does not track you, and it shows no advertising. This page says what it does collect, why, for how long, and who else sees it.
Last updated 26 September 2026.
When you press My location, the app or your browser asks your permission, then sends the coordinates to our server at https://www.weather-metric.com/ to fetch the forecast, the nearest rain gauges and the nearest cameras. When you type a postcode or a place, that text is sent the same way to find the site. The app never reads your location in the background, and it asks only when you press the button; a postcode works just as well and you need never grant it.
To answer the request, the server asks the data providers for that place: Open-Meteo for the forecast and the historical figures, the Environment Agency for rainfall and flood data, and, where the screen shows them, Transport for London for cameras. They see the coordinates of the place, not who asked.
What is kept. Each time the server issues a forecast for a place, it appends the figures it gave for the next three days to a log for that place, named by its coordinates to two decimal places, which is about a kilometre. The purpose is to mark the forecast against what the record later says happened, which is the “forecast versus measured” score on the Record tab. The log holds the place and the forecast, not who asked, not a device, and not an address.
Your last site, your saved sites and your working limits are stored in your own browser or on your own phone, not on our server.
If you register for the week-ahead and warning emails, we keep the details you give: your email address, the site (a postcode or a place), and, if you give them, your company and your occupation. They are used to send the week ahead on Monday morning and a warning at four in the afternoon on any day when tomorrow breaks one of your limits, and for nothing else. The daily run also logs the forecast it issued for each registered site, in the same place log as above.
Every email carries a one-click stop link. Stopping takes effect at once. To have your details removed entirely, email the address below and it will be done.
We count how the tool is used, on our own server: no third-party analytics, no advertising network, no cookie and nothing that follows you to another website. Because the whole tool is one page, counting page loads alone cannot tell us whether anything is useful or whether anyone comes back, so we count a few named steps.
The anonymous id. The first time you open Weather Metric, your browser makes a random id and keeps it in its own storage, with the date of that first visit. It is not made from anything about you or your device, and we never learn who holds it. Clearing your browser storage, or a private window, makes a new one.
What each count records. The name of the step, the time, that anonymous id and first-visit date, the rough area of the site you are looking at (a square of about 5 km, never the site itself), where the visit came from if it arrived by one of our own links (a QR code on a PDF, a shared link, one of our guide pages), and at most one small detail the step needs: for a share, which way (WhatsApp, Teams, copied link, the phone’s own share menu or the QR code); for a tool, which tool; for a notification sign-up, notification or email.
The steps counted. Opening the page; searching for a site; saving a site; being offered and completing an install to the home screen; turning on the 07:00 brief or limit alerts; making a PDF; downloading a CSV; sharing; arriving by a QR code or a short link; opening a tool; following a link to Construction Metric; and reading one of the guide pages.
What is never recorded: your IP address or anything worked out from it, your browser’s details, the postcode or place you typed, the site’s coordinates, your location, or anything you entered. Requests that identify themselves as bots, and browsers sending a Do Not Track or Global Privacy Control signal, are not counted at all.
How long. The individual counts are kept for 90 days, long enough to see whether people come back within four weeks. After that only the day’s totals remain and the counts, with their ids, are deleted.
Switching it off. Settings in the tool has Stop counting on this device, which also deletes the anonymous id. Turning it back on makes a new one.
The feedback box on the tool, and the camera request form, send what you write, and an email address only if you choose to add one, to Chris, who reads them himself. They are kept as long as they are needed to reply and to act on them.
If you turn these on for a site, we keep what is needed to send them and nothing else: the site’s coordinates and the name shown for it, the limits you had set and which of them were switched on, whether you chose miles per hour or kilometres per hour, the anonymous id described under Counting visits, and how the message reaches you.
As a notification. Your browser gives us an address at its own notification service (Google, Apple, Mozilla or Microsoft, whichever your browser uses) and two keys. The message is encrypted to your browser before it leaves us, so the notification service carries it without being able to read it. No name, email or phone number is involved. Turning the alerts off on the page, or blocking notifications in your browser, stops them; we remove the subscription when the notification service tells us it has gone.
By email. Where notifications are not available, one email address, the only personal data in this feature. It is used for these messages and nothing else, and every email has a one-click stop.
We also keep a log of what was sent and when, so nothing is sent twice. The iPhone app does not send notifications of its own; in the app the brief and alerts come by email.
Some parts of the tool are provided by others, and when they load, those services see your connection in the usual way, including your IP address and the area you are looking at. They are:
None of them is given your email address or anything you type into the tool.
Email to ask what is held about you, to have it corrected or deleted, or to stop the emails without the link. You can also complain to the Information Commissioner’s Office, though we would rather hear from you first.
Weather Metric is made by AI Metric Ltd, a company registered in England and Wales, number 16448110, in Liverpool. It is a free side product of Construction Metric.