Cambridge Weather from the Computer Lab

Note: if the wind speed is zero, the wind direction (if shown) is that when the wind was last blowing.

Cambridge Computer Laboratory Rooftop Weather at 05:44 PM on 14 Jul 25:

Temperature:  23.0 C
Pressure:     1000 mBar
Humidity:     86 %
Dewpoint:     20.5 C
Wind:         0 knots 
Sunshine:     4.9 hours (today)
Rainfall:     0.0 mm since midnight

Summary:      sunny, very humid, warm, calm, 23.0 C

The rainfall sensor has been fixed! Data was not collected between 1-13th Sept.

Since a power outage on 18 Jan, the pressure, humidity and wind sensors return incorrect data. We're working to replace a central component of the weather station to resolve these issues.

Current weather:

At 17:44 - sunny, very humid, warm, calm, 23.0 C

The dials show the current Cambridge weather readings, as taken on the roof of our building by the Computer Laboratory Weather Station. Also available as:

Graphs:

Archive data since 1995

Daily: text or graphs
Monthly: text or graphs
All raw data: daily files (.tar.gz), half-hourly (.csv)

Data quality and uses.

This is an amateur-maintained weather station. At the moment, we strongly advise against using the data here in statistical analysis without prior cleaning and calibration using other sources. It would be easy to draw incorrect conclusions otherwise, because:

Observations are not gathered in similar conditions to ones used by the Met Office.
Our sensors are not calibrated against references.
Some sensors have been changed over time with ones working on different principles (see implementation).
Data contains inaccuracies, and the documented list is not exhaustive.

Most of those issues can be corrected for, by pre-processing the raw data. However, we have not yet released any quality-controlled dataset.

Current weather:

Graphs:

Archive data since 1995

Data quality and uses.

Other info

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