View and compare historical periods
View and compare historical periods
Use Historical to view and compare observation charts across fixed day, week, month, and year periods. Use 24h or 7d for a rolling window.
- On iPhone, view Observation Data for the selected period.
- To change chart order and visibility, see Customize Historical charts.
- For chart-by-chart behavior, see Historical Charts.
Choose the period type
Use the period control to choose Day, Week, Month, or Year.
- On iPhone, the period control appears above the Historical charts.
- On iPad and Mac, choose the calendar button to open the period browser and period control.
Choose a stored period
After selecting a calendar period, choose the calendar button to browse stored dates. On iPhone, this opens a sheet. On iPad and Mac, it opens a popover.
Use the shortcuts at the top to jump to a commonly used period:
- Choose Today, Yesterday, One week ago, One month ago, or One year ago for observation-level detail on a specific day.
- Choose This week or One week ago for daily summaries across a week.
- Choose This month or One month ago for daily summaries across a month.
- Choose This year or One year ago for broader yearly patterns and summaries.
The date rails list periods already represented in the local station database and enable the corresponding shortcuts and period types. Choose a date in the rail, or use the previous and next arrows after closing the browser.
Hover or drag across a chart to inspect values.
In chart detail views, Chart Data lists the values behind the chart. Choose Open in Historical to show that period on the dashboard; the selected period is highlighted in the charts.
Refresh data
Historical refreshes automatically while Weather Fusion is active. The refreshed range depends on the provider.
| Provider | Automatic historical refresh | Archive Interval |
|---|---|---|
| AcuRite | Recent 7-day window | 1 hour |
| Ambient Weather | From the newest stored observation | 5 min or 30 min |
| Ecowitt | Current station day | Varies by station |
| Netatmo | Current day in 24-hour chunks | 30 min to 1 day |
| Tempest | Current and previous station day, followed by older history | 1 min to 3 hours, based on age |
| WeatherLink | Current day from the newest stored observation | 5 min or 30 min |
| Weather Underground | Recent 7-day window | 1 hour |
| WiFiLogger | Current day from the newest stored observation | Varies by station |
| Windy | Recent 7-day window | Not provided |
For Weather Underground stations, Weather Fusion also downloads daily records for older dates and shows download progress while the download runs.
Manual refresh
Use manual refresh when the latest timestamp looks older than expected.
- On iPhone and iPad, pull down to refresh.
- On macOS, choose Data › Refresh Historical or press
⌘Rwhile Historical is active.
To export the selected period as an image, see Share the Historical dashboard.