Where does the weather data come from?

Four places, kept separate on purpose. Measured rainfall comes from the nearest Environment Agency gauge, named and with its distance from your site, under the Open Government Licence. Modelled figures come from open weather-model data. Daylight and usable light are computed from solar position. Air quality is the regional PM10 and PM2.5 background. The record always says which kind of figure you are looking at, because a gauge measurement and a model estimate are different kinds of evidence.

Can I add weather to a diary kept in another product?

Yes. Export the diary as a CSV from whatever you use, drop it into Weather Metric, and it comes back with the weather for every dated row appended: measured rainfall with the gauge named, modelled conditions, sunrise and sunset, and minutes of the shift outside usable light. The file is processed in your browser and never uploaded.

Why does a weather record matter on a claim?

Weather is one of the most argued causes of delay, and "it rained all week" is an assertion. "The Environment Agency gauge 2 kilometres from site recorded 26 millimetres that day" is a fact anyone can check. A weather line captured day by day, from named sources, is contemporaneous evidence rather than a reconstruction.

Weather Metric

The weather half of a site record, done properly.

Type a postcode and get the record for any UK site: rainfall measured at the nearest Environment Agency gauge with its distance stated, modelled conditions, sunrise to sunset with the minutes of your shift outside usable light, and the air quality background. Day by day, each figure labelled for what it is, with a live map and radar alongside. Free, in the browser, no sign-up.

Open Weather Metric The full site diary

Free beta · UK sites · no sign-up

What you get

What it gives you

A named gauge, not a grid square

Measured rainfall from the nearest Environment Agency gauge, with the station and its distance from site stated. A measurement someone can check beats a model average someone can dispute.

Daylight, and what it cost the shift

Sunrise, sunset and civil twilight for the exact site, plus how many minutes of your working hours fell outside usable light. In December that number is the argument.

Live map and radar

A live weather map with radar, rain, wind, cloud and wave overlays sits alongside the record, in an embedded frame provided by Windy.com.

Bring any diary with you

Drop a CSV export from any diary product and every dated row comes back with its weather appended. The file is processed in your browser and never uploaded anywhere.

A statement you can paste

Every day builds a one-paragraph weather statement with sources named, ready to paste into a diary, a report or a notice.

Honest about what each figure is

Measured, modelled, computed and reported are different kinds of claim. The record never blends them, because a weather line only carries weight if you can say where it came from.

How it works

Type a postcode

Or a place name, or coordinates. The nearest rainfall gauge is found and named.

Pick the range and shift

Up to three months at a time, with your working hours, so lost light is measured against the day you actually work.

Read the record

Day by day: measured rain, modelled conditions, wind, daylight, air quality, and any flood warnings in force.

Take it with you

Copy a day’s statement, download the range as a spreadsheet, or import a diary CSV and get it back with weather attached.

Free, and what it is not. Weather Metric is free because the weather line belongs in the same place as the rest of the site record, and once you have seen the weather half kept properly you will know what Construction Metric does with everything else your site already says and photographs. Measured figures only reach back about a month on the free Environment Agency feed, so start capturing before you need the history. Inside Construction Metric the record is harvested nightly and kept for the life of the job.

Arguing about the weather after the fact?

Open the tool, type the postcode, and see what the record should have looked like. Then imagine it kept automatically, every day, alongside everything else the site said.

Open Weather Metric See the full platform

When the weather becomes a claim

Weather Metric shows you the weather. Construction Metric is where it becomes evidence.

Adverse weather evidence for extensions of time

What a weather record needs to survive scrutiny: a named gauge, measured and modelled kept apart, the forecast that was in force, a standdown log linked to the diary, and a monthly summary with a properly calculated 1-in-10 return period.

Read about weather evidence

Early warning notices, drafted from the record

The forecast read against your site’s own limits, and the NEC early warning drafted with the operations affected and the mitigation, marked for a person to review before it is issued.

Read about early warnings

Tender weather allowances from the long-term record

Average unsuitable days per trade and calendar month, priced into the programme and the preliminaries, with the 1-in-10 return values shown separately.

Read about tender allowances