History, records & the almanac
How your archive builds up, when longer chart ranges unlock, and what the almanac shows.
The longer your site runs, the more interesting it gets. Every reading your station produces is stored in your site's own archive - permanently - and that archive powers historic charts, all-time records and a full climate almanac.
How your archive builds
Pro Weather saves your station's readings on every refresh, about every 5 minutes, into a database you control through your site. Nothing is ever trimmed or rolled up away.
- On WeatherLink Pro/Pro+, your past data is also imported backwards in time, so charts and records can start out full.
- On the free WeatherLink Basic plan, history builds forward from the day you connect.
See WeatherLink plans & your data for the full picture.
Where your archive stands
Your site's Overview page in the dashboard has a History card per station that answers the question a short chart raises: is this still filling in, or is this all I'm ever going to get? It shows
- Archive covers: how far back your stored readings reach.
- Readings stored: how many rows are in the archive.
- Oldest and newest reading: the exact ends of it.
- Chart ranges on your site: which of 24h, 7d, 30d, 90d and 1y are live today, and when the next one unlocks.
Below that sits the import status, which is the part worth reading:
| What it says | What it means | What to do |
|---|---|---|
| Importing your WeatherLink archive | We're walking backwards through your WeatherLink history, a few days per refresh | Nothing. Longer ranges appear as it goes |
| Your WeatherLink archive is fully imported | We reached the end of what WeatherLink holds for this station | Nothing. It grows forward from here |
| History import starts on the next refresh | The first import window hasn't run yet | Wait one refresh (about 5 minutes) |
| WeatherLink is not sharing your past readings | WeatherLink refuses archive access, which is how the free Basic plan behaves | Upgrade to WeatherLink Pro/Pro+, or import a history file |
| Pushed hardware builds history forward | Your gateway sends readings as they happen, so there's no archive to read back | Nothing, or import a history file for older readings |
| Historic charts are not active on this plan | The trial ended or the subscription lapsed | Subscribe to restart archiving |
Only a live plan archives
While a site has no active trial or subscription, your public page still shows live conditions and everything already archived is kept - but new readings are not stored. Recording restarts as soon as the plan is active again.
On WeatherLink Pro/Pro+ most of the gap then fills itself back in: we sweep the past year for missing days and re-fetch them from WeatherLink. Readings pushed from your own hardware are held nowhere else, so for those only a history file import can fill the gap.
Historic charts
Every detail tab (Temperature, Wind, Rain, Pressure and so on) has a range switcher: 24h, 7d, 30d, 90d and 1y. Longer ranges unlock as your archive grows, so a brand-new site starts with 24 hours and earns the rest:
| Range | Unlocks after roughly |
|---|---|
| 24h | right away |
| 7d | 1½ days of data |
| 30d | 8 days |
| 90d | a month |
| 1y | 3 months |
Longer ranges are summarised into wider steps (hourly for 7d, up to daily for 1y) so charts stay fast - but the high/low stats shown above each chart are computed from your raw readings, so a 2-second gust or a momentary temperature spike is never flattened away.
Shareable ranges
The selected range is part of the page address (for example ?range=30d), so
you can link someone straight to a monthly view.
The almanac
The Almanac tab is your station's climate book. It appears automatically once your archive holds about a week of complete days, and grows richer from there:
- All-time records: every measurement your station reports, grouped by temperature, humidity, pressure, wind, rain and sun (see the full list below).
- This year & this month: the same record set over the running calendar year and month, so a good month stands out without having to beat an all-time record. They appear once your archive reaches back further than the period itself.
- Records by month: "the warmest June ever", per calendar month, once your archive spans more than one year. Each row shows how many years it draws on.
- Monthly summary: a table per year with each month's average high, average low, total rain and strongest gust.
- Yearly records: once your archive spans more than one year.
- This day in history: what this date looked like in previous years, once you have over a year of data.
- "New record today!": when today beats an all-time record, the almanac celebrates it with a banner.
Which records are kept
| Group | Records |
|---|---|
| Temperature | Hottest day, coldest night, warmest night, coldest day, highest and lowest daily average, largest and smallest temperature range, highest heat index, lowest wind chill, highest and lowest dew point |
| Humidity | Highest and lowest humidity |
| Pressure | Highest and lowest pressure |
| Wind | Strongest gust, strongest wind, longest wind run |
| Rain | Wettest day, wettest hour, heaviest rain rate, wettest month, wettest year, longest dry spell, longest wet spell |
| Sun | Highest solar radiation, highest UV index |
A few definitions the almanac uses:
- A rain day is any day with at least 0.2 mm.
- Warmest night is the highest a day's minimum ever got; coldest day is the lowest a day's maximum ever got.
- Wettest hour is the wettest clock hour in your station's local time.
- Wind run is the distance the air travelled past your station in a day.
- Days with only partial data (like your very first day) don't count toward records, so a half-measured day can't set a false record.
- The "new record today" banner only covers records a day still in progress can actually own - a peak reading, not something about the shape of a whole day.
Records need the underlying reading to exist, so a station without a solar sensor has no solar record. Rain rate and wind run come from the WeatherLink archive specifically: on a WeatherLink Basic plan (or a station that pushes to Pro Weather directly) those two records stay empty while every other one still fills in.
Climate reports
Next to the almanac, the Reports tab prints the NOAA-style monthly and annual climatological summaries - one row per day for a month, one row per month for a year, with a plain-text download in the classic fixed-width format. Same archive, same Pro plan, same one-week threshold. See Climate reports.
The wind rose
The Wind tab can include a wind rose: a compass-shaped chart showing which directions your wind has blown from over the last 30 days, coloured by wind strength. Choose between an 8-point or finer 16-point rose under Settings → Weather features, where you can also toggle the rose and the live wind-direction compass. Like everything historic, it fills in over time - a new site shows "Collecting wind data" until enough samples exist.
Plan notes
Historic charts, the almanac and the wind rose are part of the Pro plan and your free trial, and so is the archiving itself: readings are stored while your trial or subscription is active, and stop being stored while it isn't. Everything already collected is kept either way, and you can export it as CSV at any time.