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Reading a Station Chart Suite Across Several Time Axes

How to read a weather-station chart suite: temperature, pressure, wind, and rain together, with 24-hour, monthly, and sparkline axes kept distinct.

Back to Historical weather observations and forecasts

A station chart suite is a dashboard of several time-series figures published together: typically air temperature, barometric pressure, wind, and rain, sometimes with solar or other extras in the same grid. The scientific job is not to admire a PNG. It is to read those traces as one experiment at one site while refusing to pretend they share a single clock. A 24-hour temperature panel, a 31-day humidity panel, a yearly rain total, and a 60-minute sparkline are four different products. Placing them on one page does not merge their time axes.

The historical TNET Weather page at /charts.php was that suite for a Mesa, Arizona personal weather station. The recovered layout stacked 24-hour charts, rain totals at day/month/year grain, month-length traces, and last-hour sparklines. The original images are not rehosted, and no Mesa snapshot on this URL is current weather. This article is a reading guide for the suite as a whole.

Historical context

Personal weather websites of that era needed a page visitors could scan without opening a logger. Weather Display and similar publishers rendered a set of graphs on a schedule and dropped them into a template. Incoming links treated /charts.php as “the charts.” What the URL actually held was a multi-panel figure plate with mixed windows: hours, days, a month, a year, and a sparkline strip.

Neighboring URLs did other jobs. Current conditions is a table of now. A single temperature time-series is one variable, one axis. Sparklines are word-sized quality-control traces, not the destination charts. Rain-detail isolates precipitation grain. This page is the suite: several standard variables, several clocks, one dashboard.

A suite is a layout contract, not one plot

Treat each panel as a labeled figure:

  1. Quantity (air temperature, station or sea-level pressure, wind mean or gust, rain accumulation or rate).
  2. Unit (°F or °C; inHg or hPa; mph, kt, or m/s; inches or millimetres).
  3. Time window (rolling 24 hours, calendar day, 31 days, month-to-date, year-to-date, last 60 minutes).
  4. Reset rule (local midnight, 09:00 rain day, rolling window).
  5. Station identity (this logger, not a demo file).

If two panels omit any of those five, you cannot compare them. A falling temperature line next to a rising rain line is only a joint observation when both clocks, both units, and both siting notes are known. Otherwise you have adjacent decorations.

The recovered suite mixed windows on purpose. Operators wanted “today,” “this month,” and “this year” in one scroll. That is a valid station diary. It becomes invalid the moment a visitor reads a yearly rain PNG as if it were the same experiment as the last hour of wind.

How to keep several time axes honest

Do not share an unlabeled x-axis across panels of different length. A 24-hour chart and a 31-day chart that happen to be the same pixel width will make a month look as busy as a day. Width is layout. Duration is metadata. Print the duration on every panel.

Name rolling versus calendar windows. A rolling 24-hour temperature chart that includes last night is not “today.” A rain-year chart that resets on 1 January is not a water year. Arizona cooperative networks have used different hydrologic-year conventions; a backyard yearly PNG is whatever the software was configured to reset. State the reset.

Do not stack solar, pool, or indoor traces as if they were outdoor air. The historical page included solar radiation and pool temperature beside outdoor air and barometer. Those are useful station sensors. They are not interchangeable with a Stevenson-screen series. Caption them as what they measure.

Sparklines belong in a different row, with a different claim. A last-60-minute strip answers “is the logger still moving?” A 24-hour chart answers “what did the afternoon do?” Mixing them without labels trains the eye to treat a QA strip as climate. Keep the sparkline labeled as a short window; the sparkline article covers that job.

Month-length charts are not climate normals. A 31-day barometer or high/low temperature panel is a month of this station. Official U.S. climate normals are 30-year, quality-controlled network statistics from NOAA NCEI. A PWS month chart can sit beside a normal as context. It is not the normal.

Reading temperature, pressure, wind, and rain together

Once each panel has a declared window, the suite earns its keep: co-occurrence.

Temperature and pressure. A falling barometer with a falling temperature can be a cold frontal passage. A falling barometer with a rising afternoon temperature on a desert summer day can be the diurnal cycle plus heating, not a cyclone. The 24-hour pair is the right grain for that distinction. The 31-day pair is not. Short-term rising/falling language belongs with station trends, not with a yearly thermograph.

Wind and pressure. A pressure fall that is not accompanied by a wind increase may be a local heating signature or a bad reduction to sea level. A wind spike with a flat barometer is often a convective outflow or a sensor gust, not a synoptic gradient. Read gust and mean as named statistics. An unlabeled “wind” panel is incomplete.

Rain against the other three. In the Sonoran Desert, rain is often a few convective bursts, not a long stratiform event. A 24-hour rain panel may show one spike; the monthly panel shows whether that spike was the month. The yearly panel is a sum. Sums hide timing. If you need tips versus hours versus days, that is the rain-detail page. On this suite, rain is the fourth instrument in the same scan: did the wet interval line up with a temperature drop, a pressure jump, and a wind gust, or did rain plot on a different day than the wind panel’s spike because the windows differ?

Solar as a check, not as weather. If solar radiation is on the suite, it is a siting and clock check. A temperature spike at zero solar is not afternoon heating. A solar panel in local time that disagrees with the temperature panel’s timezone is a publishing bug.

None of these readings is a National Weather Service forecast. They are observed co-occurrence at one mount. Official watches and warnings come from weather.gov.

Practical checklist

  • Every panel names quantity, unit, window, and timezone.
  • 24-hour, 31-day, month-to-date, year-to-date, and 60-minute graphics are never treated as one series.
  • Wind mean and gust are labeled; pressure type (station versus sea-level) is labeled.
  • Indoor, pool, and solar traces are captioned as such.
  • Gaps are visible; a smooth line across an outage is not extra data.
  • The suite is not titled as a sample or another station’s demo.
  • Sparklines are used for freshness, not as substitutes for the 24-hour plate.

If the checklist fails, read the suite as an illustration of the old site’s layout, not as a climate record.

Modern relevance

Multi-panel weather dashboards still hide mixed clocks. So do research pages that place precipitation, wind, and cloud products in one view. TNET groups atmospheric observations as one evidence family among others; a chart suite is usable in that sense only when each panel keeps its window and unit. See the evidence families behind a connection outlook. The historical observations hub lists the related station pages.

This URL does not stream live Mesa charts. It teaches how to read the historical product that once did: several instruments, several time axes, one honest scan.

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