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 01:39 AM on 24 Jul 21: Temperature: 12.7 C Pressure: 1013 mBar Humidity: 95 % Dewpoint: 11.9 C Wind: 2 knots from the N Sunshine: 0.0 hours (today) Rainfall: 0.0 mm since midnight Summary: very humid, cool, light winds
At 01:39 - very humid, cool, light winds, 12.7 C
- There is a known issue with the sunlight and rain sensors sometimes over-reporting readings. We are investigating how best to fix this and we should be able to correct archived records once the problem is resolved.
Maps:
Lightning
The dials show the current Cambridge weather readings, as taken on the roof of our building by the DTG Weather Station. Also available as:
Archive data since 1995
- Daily: text or graphs
- Monthly: text or graphs
- All raw data: daily text files (tar.gz archive)
- All raw data: single CSV file and the format for interpreting it
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.
Feedback
Please drop us a line if you discover any inaccuracies in the reported weather data, or if you have general feedback, comments or questions.
Other info
- Inaccuracies in the weather data.
- Implementation of the service.
- Location of the sensors.
- Mailing list for announcements regarding service changes or recording errors.
If you wonder what "Dew Point" means, see here for a simple explanation, or here for more than you want to know.
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