Weather Calendars Built for Construction
Convert raw climate data into day-by-day predictions of whether each planned activity can proceed. 80+ weather variables. 45+ years of data. Export-ready for P6, Asta, and MS Project.
Rules of Thumb Cost You 10-15 Days Per Project
Planners still build weather allowances using generic assumptions: "add 10% for winter" or "lose two days a month to rain." These flat estimates ignore your specific activities, your actual site location, and the real seasonal patterns that drive downtime.
The result? Programmes that are either too optimistic (leading to delays and claims) or too conservative (wasting client budgets and compressing margins).
How Weather Calendars Work
Three steps from programme upload to construction-ready weather calendars.
Upload Your Programme
Import your schedule from P6, Asta Powerproject, MS Project, or Excel. WeatherWise reads your activities, durations, and site location automatically.
Set Activity Thresholds
Define what stops work for each activity: wind speed for crane lifts, rainfall for earthworks, temperature for concrete pours. Use defaults or customise to your specifications.
Generate Calendars
WeatherWise analyses 45+ years of climate data at your exact coordinates and generates precise calendars showing working vs. non-working days for every activity.
Key Features
Everything you need to build data-driven weather allowances into your construction programme.
80+ Weather Variables
Wind, rain, temperature, humidity, snow, visibility, wave height, lightning risk, and more. Set thresholds for exactly the conditions that stop your work.
Activity-Specific Thresholds
Different activities have different weather sensitivities. Set unique thresholds for crane lifts, earthworks, concrete pours, steelwork, and every other activity in your programme.
Scheduling Tool Export
Export directly to P6 .plf calendar files, Asta Powerproject, Microsoft Project, and Excel. No manual data entry required.
Monthly & Seasonal Patterns
See exactly how weather risk varies month by month and season by season at your site. Plan critical activities around the windows that offer the best conditions.
Historical & Forecast Modes
Generate calendars from 45+ years of historical climate data for planning, or switch to forecast mode for real-time operational decisions.
92.3% Validated Accuracy
Validated across 300+ major construction projects worldwide. Built on ERA-5 reanalysis data with climate change adjustment for current conditions.
Used on 300+ Construction Projects Worldwide
See how leading contractors use weather calendars to eliminate unplanned downtime and protect programme certainty.
Frequently Asked Questions
Can't find what you're looking for? Book a demo and we'll walk you through it.
What weather variables can I set thresholds for?▾
How far back does the historical data go?▾
Can I export weather calendars to Primavera P6?▾
How accurate are the weather calendars?▾
Is there a free tier?▾
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Generate Your First Weather Calendar Free
No card required. Upload your programme and get construction-ready weather calendars in minutes.