About WeatherArchive
Our Mission
WeatherArchive is a data-rich research platform for accessing historical weather data, climate patterns, and weather comparisons. Built for users who need to look backward rather than forward, we provide comprehensive past weather insights, climate averages, sunrise/sunset calculations, and multi-city weather comparisons.
Unlike real-time weather apps, WeatherArchive specializes in answering "What was the weather like?" and "What should I expect based on history?" - perfect for event planning, travel research, photography scheduling, and data analysis.
Our Mission
WeatherArchive is a data-rich research platform for accessing historical weather data, climate patterns, and weather comparisons. Built for users who need to look backward rather than forward, we provide comprehensive past weather insights, climate averages, sunrise/sunset calculations, and multi-city weather comparisons.
Unlike real-time weather apps, WeatherArchive specializes in answering "What was the weather like?" and "What should I expect based on history?" - perfect for event planning, travel research, photography scheduling, and data analysis.
Data Sources
Historical Weather Data
We source historical weather data from reputable providers including Visual Crossing Weather API and Open-Meteo, which aggregate data from NOAA, national weather services, and verified weather stations worldwide.
Climate Normals
Climate averages and patterns are based on 30-year climate normals from official meteorological organizations, providing reliable long-term climate data.
Sun Position Calculations
Sunrise, sunset, and golden hour times are calculated using the SunCalc.js library, which implements precise astronomical algorithms for sun position calculations.
Geocoding
Location searches are powered by Nominatim (OpenStreetMap), providing accurate geocoding for cities, addresses, and coordinates worldwide.
Methodology
Historical Weather Lookups
When you search for past weather, we query verified historical weather records from weather stations and meteorological databases. Data accuracy depends on the quality and availability of local weather station records for the specific date and location.
Climate Averages
Climate normals represent 30-year averages calculated from historical weather data. These provide reliable expectations for typical weather patterns throughout the year.
Weather Comparisons
Multi-city comparisons normalize data across different locations and time periods, allowing for meaningful side-by-side analysis of weather patterns and conditions.
Accuracy & Limitations
Data Accuracy
While we strive to provide accurate historical weather data, accuracy depends on:
- Quality and availability of historical weather station records
- Geographic proximity to weather monitoring stations
- Data completeness for the requested date and location
Use Cases
WeatherArchive is designed for research, planning, and curiosity purposes. Historical data should not be used as the sole basis for critical decisions involving safety, legal matters, or financial transactions without verification from official meteorological sources.
Who We Serve
Event Planners
Select outdoor event dates based on historical weather patterns and success rates.
Travelers
Research typical weather conditions for vacation destinations before booking.
Photographers
Plan shoots around golden hour times and assess weather reliability.
Researchers
Access historical weather data for studies, reports, and analysis.
Privacy-First Approach
WeatherArchive is built with privacy as a core principle:
- No user accounts or authentication required
- All user data stored locally in your browser
- No tracking or personal data collection
- Full data export and deletion control
Read our full Privacy Policy.
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