60.1(13): Weather measurements exceed stated limits | NEC Clauses Explained

Reviewed by LazyQS Editorial·Last reviewed: 2026-02-19

Plain English Explanation

This CE applies where weather conditions at the Site are recorded as more severe than the weather measurements stated in the Contract Data (or, if not stated, as would have occurred less than once in 10 years based on historical data). The contract requires specific weather measurements to be stated — typically rainfall, temperature, wind speed, and snow — with threshold values.

Under NEC4, if actual weather measurements at or near the Site exceed those thresholds, you are entitled to a CE for the impact on your works. This is a factual test — actual measurements against contractual thresholds — not a general 'bad weather' claim.

For this CE to work in practice, you need weather monitoring data from a recognised source (e.g. the Met Office) and a clearly defined weather measurement station in the Contract Data.

Key Takeaway

Bad weather is not automatically a CE — you need measured data from an approved weather station showing the contractual thresholds were exceeded; keep site weather records on every project.

What This Means for Subcontractors

Weather CEs are often misunderstood. You cannot claim simply because it rained. You need to show actual measurements exceeded the contractual thresholds. Most subcontracts that flow down NEC obligations will include the weather measurement data from the main contract. Maintain site weather records and cross-reference them against the thresholds in your contract.

Common Risks & Disputes

1The Contract Data not specifying weather measurement thresholds, making the CE unenforceable
2Relying on general accounts of bad weather rather than measured data from an approved weather station
3The PM disputing the location of the measurement station or the accuracy of the data
4Failing to record which activities were actually impacted by the weather event and for how long
5Assuming bad weather is automatically a CE — the threshold test makes most claims harder than expected