Why the right platform matters — and why it is not obvious
When someone searches for a "construction weather app", they are not all looking for the same thing. A site foreman deciding whether to pour concrete at 6am needs an immediate, trade-specific go/no-go answer. A project manager facing a programme delay needs a contractual early warning notice. A QS building a delay claim needs ten years of historical data benchmarked against contract thresholds. A safety manager on a large civil site needs lightning detection and instant SMS alerts to the crew.
These are four genuinely different problems. The platforms that dominate search results have been designed to solve one or two of them well. Choosing the wrong one is not just a usability issue — it is a risk management issue if the tool you are using does not produce outputs that hold up in a formal claims process.
This guide covers four platforms that frequently come up in the same conversation: EHAB WeatherWise, Perry Weather, JobSite Weather, and Construction Weather. It is written from the perspective of a contractor on a commercial project under a standard form contract — NEC, JCT, FIDIC, AS 4000 or NZS 3910.
The four platforms at a glance
EHAB WeatherWise
EHAB is an enterprise platform designed for large contractors and construction programmes. It monitors live and forecast weather against custom activity thresholds and sends real-time alerts via SMS, email or WhatsApp when conditions are approaching or have breached the set limit. It is designed for the operational safety and programme management side of weather risk — preventing unplanned downtime by alerting the site team before conditions deteriorate.
Strong points
- Real-time and forecast threshold monitoring with push notifications
- Multi-channel alerts — SMS, email, WhatsApp
- Custom activity thresholds per project or operation
- Enterprise integrations and multi-site dashboards
- Strong operational safety use case for large programmes
Less suited to
- Generating contractual EOT evidence benchmarked against historical norms
- Producing formal early warning notices structured to NEC/JCT/FIDIC requirements
- Tender-stage weather allowance pricing
- Self-serve access — enterprise pricing and onboarding
- Historical data retrieval for past project months
Perry Weather
Perry Weather is a jobsite safety platform centred on on-site hardware — weather stations installed on the physical site that provide real-time local measurements. Its primary strength is lightning detection and wind monitoring for site safety, with automated alerts to halt operations when conditions become dangerous. It is widely used in the US market, particularly on large civil and infrastructure projects where lightning risk is a live safety concern.
Strong points
- On-site hardware provides hyperlocal real-time measurements
- Lightning detection with safe/unsafe site status
- Wet-bulb globe temperature (WBGT) and heat stress monitoring
- Strong for US market field safety compliance
- Wind monitoring tied to physical site conditions
Less suited to
- Contractual EOT documentation — on-site sensor data carries less legal weight than certified agency data in formal disputes
- Historical benchmarking for delay claims — no pre-project baseline
- Tender-stage weather risk pricing
- Generating draft early warning notices for NEC/JCT/FIDIC contracts
- Sites outside the US where lightning is not the primary risk driver
JobSite Weather
JobSite Weather is a mobile app designed for field crews and tradespeople. It translates general weather forecasts into trade-specific workability ratings — roofing, concrete, painting and similar operations — so workers can get a fast go/no-go read without interpreting raw forecast data. It is a field-first tool: simple, mobile-focused and designed for the person at the site fence, not the project office.
Strong points
- Clean mobile-first interface designed for field crews
- Quick trade-specific workability ratings
- Low barrier to adoption for tradespeople and small contractors
- Consumer-grade simplicity — minimal setup
Less suited to
- Contractual documentation — no EOT evidence, no early warning notice generation
- Historical data retrieval or benchmarking for delay claims
- Tender-stage weather allowance calculation
- Projects under standard form contracts where formal notice obligations apply
- Multi-trade site planning across a 14-day programme window
Construction Weather
Construction Weather is designed around the full project lifecycle — from pricing weather risk at tender through to daily site planning, contractual early warning notices and EOT evidence for delay claims. It is used by site managers for daily trade advisory decisions, by project managers for programme protection, and by commercial teams and QSs for claim preparation. It uses certified gridded meteorological data — not on-site hardware — so outputs are structured for both daily operational decisions and formal contractual use.
Strong points
- Daily trade advisories for 20+ operations — site managers' daily planning tool
- 14-day outlook with hourly breakdown for amber and red days
- Generates contractual early warning notice drafts from forecast data
- EOT evidence generator benchmarks project months against 5–10 year historical data
- Tender planning tool calculates average unsuitable days by operation and month
- Certified meteorological data — legally defensible in formal disputes
- Aligned to NEC3, NEC4, JCT, FIDIC, AS 4000 and NZS 3910
- No hardware, no installation — works for any site worldwide from day one
- Free during open beta
Less suited to
- Real-time push safety alerts — not designed as a lightning or gust alarm system
- Enterprise multi-site dashboard with SMS alert broadcasting
- Projects where the primary need is on-site hardware with physical station data
Side-by-side comparison
The table below compares the four platforms across the features most relevant to contractors on commercial projects.
| Feature | EHAB WeatherWise | Perry Weather | JobSite Weather | Construction Weather |
|---|---|---|---|---|
| Daily trade-specific advisories | ◑ Threshold alerts | ◑ Safety focus | ✓ Field ratings | ✓ 20+ operations, G/A/R |
| 14-day planning outlook | ✓ | ◑ | ✓ | ✓ With hourly breakdown |
| Real-time push alerts (SMS/email) | ✓ Core feature | ✓ Core feature | ✗ | ◑ In-app alerts |
| On-site weather hardware | ✗ | ✓ Core feature | ✗ | ✗ Gridded data instead |
| Lightning detection | ✗ | ✓ Core feature | ✗ | ✗ |
| Contractual early warning notices | ✗ | ✗ | ✗ | ✓ Editable Word drafts |
| EOT evidence generator | ✗ | ✗ | ✗ | ✓ vs 5–10yr benchmark |
| Historical weather data retrieval | ✗ | ✗ | ✗ | ✓ Any date, any location |
| Tender-stage weather allowance tool | ✗ | ✗ | ✗ | ✓ 10yr average by trade |
| NEC / JCT / FIDIC alignment | ◑ Partial | ✗ | ✗ | ✓ Built around standard forms |
| Certified meteorological data source | ✓ | ✗ On-site sensor | ◑ | ✓ National agency gridded data |
| No hardware installation required | ✓ | ✗ | ✓ | ✓ |
| Works on mobile without app download | ◑ | ◑ | ✓ Native app | ✓ Web app, add to home screen |
| Self-serve access / free tier | ✗ Enterprise only | ✗ Requires hardware purchase | ✓ | ✓ Free in open beta |
✓ Supported ◑ Partial / limited ✗ Not available. Based on published platform documentation; features may change.
The sensor vs certified data question
One of the most common questions when evaluating construction weather platforms is whether on-site hardware (a physical weather station installed on the site) is better than certified gridded data from a national meteorological agency.
For real-time operational safety — deciding whether to halt a crane lift because of a gust reading right now — on-site hardware has genuine value. The measurement is physically at the fence line. Perry Weather's model is built for this use case and it does it well.
For contractual dispute resolution, the picture is very different. When an EOT claim is formally assessed — whether by a contract administrator, adjudicator or arbitrator — the opposing party's first move is to challenge the data source. An on-site sensor installed by the contractor raises three immediate challenges: Was it properly calibrated? Was it maintained throughout the project? Was its location representative of site conditions? None of these questions can be asked of data from a national meteorological agency, which carries an independent chain of custody and a calibration record predating the project by decades.
There is also the historical baseline problem. To establish that a weather event qualifies under NEC4's "1-in-10-year" test, or the equivalent exceptional/adverse threshold under JCT or FIDIC, you need a historical dataset at the same location. An on-site sensor installed at project commencement has no pre-project history. Certified gridded data does — going back 10, 20 or 30 years at the same grid point.
Which platform fits your situation
Three questions determine the right platform for a given project and role.
My primary need is real-time safety alerts — halt the crew when conditions become dangerous
You need a platform with live threshold monitoring and push notifications. If lightning is a serious risk, physical hardware is worth considering.
EHAB or Perry WeatherMy primary need is a fast daily go/no-go for field crews on a smaller project
A lightweight mobile-first field app is the right fit — minimal setup, fast access, trade workability ratings.
JobSite WeatherMy primary need is to plan the week's work, avoid weather disruption and keep the programme on track
You need a 14-day trade-specific planning tool, with hourly breakdowns for amber days and a live site conditions check. Used by site managers and project managers on commercial projects.
Construction WeatherMy primary need is to document weather delays and build an EOT claim under NEC, JCT or FIDIC
You need certified data, a historical benchmark, a contractual framing tool and notice generation. This is the only category where the data source matters for defensibility.
Construction WeatherI am pricing weather risk into a tender and need to know what allowance to include
You need a historical analysis tool that calculates average unsuitable days by trade operation and project month at the specific site location.
Construction WeatherI need both field safety alerts and contractual documentation on the same project
These are genuinely different tools for different users. Consider running both — a field safety platform for the site supervisor and a contractual workflow platform for the project office.
EHAB + Construction WeatherThe key distinction
The construction weather software market looks like it is selling one thing. It is actually selling four different things to four different users at four different moments in the project.
EHAB and Perry Weather are operational safety platforms — they prevent downtime and protect people. JobSite Weather is a field convenience tool — it gives a fast workability read for tradespeople. Construction Weather is a contractual workflow platform — it supports planning decisions on site, protects programme entitlement through notices, and builds the evidence base for delay claims.
The contractor who has lost a weather claim because the records were not contemporaneous, the notices were not issued in time, or the data source was challenged in adjudication — that contractor needed a different tool to the one they were using. Construction Weather is designed specifically to close those gaps, from the first day on site to the final account.
Frequently asked questions
Is Construction Weather better than EHAB WeatherWise?
EHAB WeatherWise and Construction Weather solve different problems. EHAB is an enterprise alert platform that monitors live and forecast weather against custom activity thresholds and sends real-time alerts by SMS, email and WhatsApp when conditions approach or breach a limit — it is designed for operational safety and programme management on large programmes. Construction Weather is a contractual workflow platform: it provides daily trade-specific planning advisories, generates contractual early warning notice drafts from forecast data, and produces EOT evidence benchmarked against 5–10 years of historical data at the project location.
For contractors who need real-time safety push alerts, EHAB is the stronger fit. For contractors who need contractual documentation, EOT evidence, tender planning and certified data that holds up in formal disputes, Construction Weather is designed specifically for those needs. Many contractors use both on the same project — EHAB for the site supervisor's safety alerts and Construction Weather for the project office's contractual records.
Does Construction Weather work as a Perry Weather alternative?
It depends on what you need Perry Weather for. Perry Weather is centred on on-site hardware — physical weather stations with real-time local measurements, lightning detection and WBGT heat stress monitoring, primarily for US market field safety compliance. Construction Weather does not include on-site hardware or lightning detection. If your primary need is real-time safety monitoring with physical stations, Perry Weather is the better fit.
If your primary need is daily trade-specific planning advisories, contractual early warning notices, EOT evidence generation and tender weather allowance pricing, Construction Weather covers those gaps that Perry Weather does not — including historical data retrieval and formal EOT documentation using certified meteorological data that is legally defensible in adjudication.
Does Construction Weather work as a JobSite Weather alternative?
Yes — for contractors who need more than a quick field workability read. JobSite Weather is a mobile app that translates forecasts into trade-specific workability ratings for field crews — simple, mobile-first and easy to adopt. Construction Weather provides the same trade-specific go/no-go answer through daily green, amber and red advisories for over 20 operations, with a 14-day outlook and hourly breakdown on amber and red days.
Where it goes further is everything JobSite Weather is not built for: contractual early warning notice drafts generated from forecast data, EOT evidence benchmarked against 5–10 years of historical data at the project location, tender-stage weather allowance calculation, and multi-trade planning across a 14-day programme window. For a tradesperson who wants a fast go/no-go read at the site fence, JobSite Weather's consumer-grade simplicity is a strength. For contractors on standard form contracts such as NEC, JCT or FIDIC — where formal notice obligations and delay documentation apply — Construction Weather covers both the daily workability question and the contractual record that JobSite Weather does not.
Which construction weather platform is best for EOT claims and contractual delay documentation?
Construction Weather is the only platform in this comparison designed specifically for contractual EOT documentation. It uses certified gridded meteorological data — not on-site sensors — which provides an independent chain of custody that survives challenge in adjudication or arbitration. It benchmarks project months against 5–10 years of historical data at the same location, which is required to satisfy the 1-in-10-year test under NEC4 or the exceptional adverse weather threshold under JCT or FIDIC. It also generates early warning notice drafts structured to NEC3, NEC4, JCT, FIDIC, AS 4000 and NZS 3910.
EHAB WeatherWise, Perry Weather and JobSite Weather do not include EOT evidence generation or historical benchmarking.
Why does on-site sensor data carry less legal weight than certified meteorological data in weather delay claims?
When a formal EOT claim is assessed by a contract administrator, adjudicator or arbitrator, the opposing party will challenge any data source the contractor installed themselves. An on-site sensor raises three immediate questions: Was it properly calibrated? Was it maintained throughout the project? Was its location representative of site conditions? None of these challenges apply to data from a national meteorological agency, which carries an independent calibration record predating the project by decades.
There is also the historical baseline problem — to satisfy NEC4's 1-in-10-year test or the equivalent exceptional weather threshold under JCT or FIDIC, you need historical data at the same location. An on-site sensor installed at project commencement has no pre-project history; certified gridded data does, going back 10 to 30 years at the same grid point.
Can Construction Weather handle daily site planning as well as EOT claims?
Yes. Construction Weather covers the full project lifecycle. For daily site planning, it provides trade-specific green, amber and red advisories for over 20 construction operations — concreting, groundworks, roofing, painting and others — with a 14-day outlook and hourly breakdown on amber and red days. Site managers use this to make daily go/no-go decisions at 6am.
The same platform also generates contractual early warning notice drafts from forecast data, produces EOT evidence benchmarked against historical norms, and includes a tender planning tool for pricing weather risk into bids. This combination of operational daily planning and contractual documentation distinguishes it from field-only tools like JobSite Weather or alert-only platforms like EHAB WeatherWise.