History, records & the almanac

How your archive builds up, when longer chart ranges unlock, and what the almanac shows.

Every reading your station produces is stored in your site's own archive, permanently, and that archive is what the historic charts, the all-time records, the climate almanac, the climate reports and the chart builder are built from.

How your archive builds

Pro Weather saves your station's readings on every refresh, about every 5 minutes. Nothing is trimmed or rolled away.

On WeatherLink Pro/Pro+ and on a vendor-cloud connection, your past data is also imported backwards in time, so charts and records can start out full.
On the free WeatherLink Basic plan and for pushed hardware, history builds forward from the day you connect, unless you import a history file.

See WeatherLink plans & your data for how the plans differ.

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: the past year is swept for missing days and they are re-fetched 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 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 figures 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.

For a chart the fixed panels do not draw, such as soil temperature against air temperature over a frost, the optional chart builder lets visitors pick any six series and any window up to 400 days.

The almanac

The Almanac tab is your station's climate book. It appears once your archive holds about a week of complete days, and grows from there:

All-time records: every measurement your station reports, grouped by temperature, humidity, pressure, wind, rain and sun (the full list is below).
This year and 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 says so 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) do not count toward records, so a half-measured day cannot 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 Homepage → Wind and sky detail, 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.

The weather day

Daily totals and records need a decision about when a "day" ends, and that decision is yours: Advanced → Weather day sets the hour one day's readings stop counting and the next day's begin.

Midnight is the default. UK and Australian observers report rain against a day that runs 9am to 9am, so a wet night belongs to the morning it is read; pick 9am (or 10am) to match that convention, or to compare like-for-like with an official station nearby. Changing it re-reads your whole archive in the background, which takes a few minutes, and everything daily follows: rain totals, daily records, the almanac and the climate reports. Your charts stay on calendar days regardless, since a bar labelled Tuesday should cover Tuesday.

Plan notes

Historic charts, the almanac, the reports, the chart builder and the wind rose are part of the Pro plan and the free trial, and so is the archiving itself: readings are stored while your trial or subscription is active, and stop being stored while it is not. Everything already collected is kept either way, and you can export it as CSV at any time.