Tryfan cloud-base observations

Cloud-base data for guides, researchers and developers

Looking for cloud-base observations on UK mountains? We currently publish camera-derived readings for Snowdon and Tryfan. Use them as additional context for a hill day, to explore cloud changes or to compare a forecast with what was visible from a fixed viewpoint.

Choose a date above to download the retained readings as CSV or JSON, including observation times, available height estimates or bounds, cloud-edge descriptions and confidence flags. An empty height is missing data, not a clear summit. Coverage is limited to these camera views and the retained archive.

Please credit Mountain Weather and the camera provider, link back here, and keep the observation time and quality flags with the height. These provisional estimates are not a calibrated cloud-height instrument or a standalone basis for safety-critical decisions. For an operational feed or a research collaboration, tell us what you need so we can discuss coverage and limitations.

Decimal values in a download are model output, not a claim of metre-level accuracy. These are image-derived estimates, not instrument measurements. Camera photographs have their own licences and permissions; a data download does not grant rights to republish them.