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< head >
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< title > Thermograph — reading the grades< / title >
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< meta name = "description" content = "Pick any point on Earth and see how its recent weather stacks up against ~45 years of local climate history — graded days, calendars, forecasts, and side-by-side comparisons." / >
< meta name = "theme-color" content = "#f0803c" / >
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< meta property = "og:type" content = "website" / >
< meta property = "og:site_name" content = "Thermograph" / >
< meta property = "og:title" content = "Thermograph — reading the grades" / >
< meta property = "og:description" content = "Pick any point on Earth and see how its recent weather stacks up against ~45 years of local climate history — graded days, calendars, forecasts, and side-by-side comparisons." / >
< meta property = "og:url" content = "__ORIGIN__/legend" / >
< meta property = "og:image" content = "__ORIGIN__/logo.png" / >
< meta property = "og:image:width" content = "512" / >
< meta property = "og:image:height" content = "512" / >
< meta property = "og:image:alt" content = "Thermograph logo" / >
< meta name = "twitter:card" content = "summary" / >
< link rel = "icon" href = "logo.svg" type = "image/svg+xml" / >
< link rel = "apple-touch-icon" href = "logo.png" / >
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< link rel = "stylesheet" href = "style.css" / >
< / head >
< body >
< header >
< div class = "brand" >
< span class = "logo" > ▚< / span >
< div >
< h1 > Thermograph · Guide< / h1 >
< p class = "tag" > What the metrics and percentile grades mean< / p >
< / div >
< nav class = "view-nav" aria-label = "Views" >
< a href = "./" data-view = "map" > Weekly< / a >
< a href = "calendar" data-view = "calendar" > Calendar< / a >
< a href = "day" data-view = "day" > Day< / a >
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< a href = "compare" data-view = "compare" > Compare< / a >
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< / nav >
< / div >
< / header >
< main class = "guide" >
< section class = "guide-block" >
< h2 > How the grades work< / h2 >
< p > Every grade is < b > relative to this place's own climate history< / b > , not an absolute
temperature. For each day Thermograph builds a ± 7-day seasonal distribution from
decades of local records, then reports the < b > percentile< / b > where the day falls in it.< / p >
< p > So a 60° day can be “ Above Normal” in one place or season and
“ Below Normal” in another. That's why the categories read
“ Above/Below Normal” , “ High/Low” , and “ Near Record” —
never “ hot” or “ cold” .< / p >
< / section >
< section class = "guide-block" >
< h2 > Grade scale — percentile of the local ± 7-day history< / h2 >
< div class = "guide-scale" id = "temp-scale" > < / div >
< / section >
< section class = "guide-block" >
< h2 > Rain intensity — percentile among rain days< / h2 >
< p class = "muted" > Precipitation is graded only across days that actually saw rain, so
“ Heavy” means heavy < i > for a rainy day here< / i > . Dry days are colored by
their dry streak instead (below).< / p >
< div class = "guide-scale" id = "rain-scale" > < / div >
< / section >
< section class = "guide-block" >
< h2 > The metrics< / h2 >
< dl class = "guide-metrics" >
< dt > High / Low< / dt > < dd > The day's highest and lowest air temperature (° F).< / dd >
< dt > Feels< / dt > < dd > Apparent temperature — what the air actually felt like once humidity
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and wind are factored in, taking whichever apparent extreme (heat-index high or
wind-chill low) sits further from a temperate baseline, graded against its own history.< / dd >
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< dt > Humid< / dt > < dd > Absolute humidity: grams of water vapor per cubic meter of air (g/m³ ).< / dd >
< dt > Wind< / dt > < dd > Average sustained wind speed (mph).< / dd >
< dt > Gust< / dt > < dd > Peak wind gust for the day (mph).< / dd >
< dt > Precip< / dt > < dd > Total precipitation (inches), graded by intensity among rain days.< / dd >
< dt > Dry streak< / dt > < dd > Consecutive days since the last measurable rain — the color deepens
the longer it's been dry, and resets to blue on a rain day.< / dd >
< / dl >
< / section >
< p class = "guide-back" > < a href = "./" > ← Back to Thermograph< / a > < / p >
< / main >
Convert the frontend to ES modules; split nav.js by concern (#48)
The frontend was classic scripts sharing one global scope, with a
load-order contract enforced only by comments (leaflet -> nav ->
shared -> mappicker -> page) and hand-rolled window.Thermograph /
window.LocationPicker namespaces. Page scripts now import what they use;
the dependency graph replaces the ordering contract, and no app globals
remain (Leaflet stays a classic script / global L, loaded first).
nav.js had grown four concerns; it's now three single-purpose modules:
- nav.js: last-location memory + header view-links + locHash.
- units.js: the °F/°C toggle and unit-aware formatting. The compare
special case is gone — pages that want the toggle import units.js;
compare simply doesn't.
- cache.js: the IndexedDB response cache, SWR getJSON, bundle-seeded
view prefetch and neighbor warming. prefetchViews(lat, lon, ownViews)
now takes the calling page's own view names instead of a page-identity
map (VIEW_OWN) — adding a page no longer means editing this module.
The slice->URL map stays here as bundle-contract knowledge.
frontend/package.json ({"type": "module"}) makes CI's node --check
parse the files as modules.
Verified: node --check on all files as modules; 108 backend tests;
headless-Chromium smoke across all five pages against live data — zero
console/page errors, all render assertions pass (cards, chart, calendar
grid + metric switch, ladders, compare ranking, legend scales).
2026-07-11 20:28:33 +00:00
< script type = "module" >
import "./nav.js"; // header view-links follow the last location
import "./units.js"; // the °F/°C toggle
Extract shared.js: one home for tier colors, scales, formatters, helpers (#47)
The page scripts each re-declared the shared presentation layer — the tier
color table existed in four places (app.js, calendar.js, day.js, style.css)
and the scale label tables in three (plus legend.html's own drifting copy),
alongside per-page copies of the dryness ramp, formatters, ord, todayISO,
esc, the weather icons/summary, month helpers and the 2-year range chunker.
~240 duplicated lines deleted (net -236 with the new module included).
- frontend/shared.js (IIFE, extends window.Thermograph): tier colors read
from style.css's :root custom properties at load — the CSS is now the
single source of truth; the JS map exists only because inline-SVG work
(chart + PNG export) needs literal values, with hex fallbacks for a
missing stylesheet. Plus SCALE_TEMP/SCALE_RAIN, drynessColor, fmt*, ord,
todayISO, esc, placeLabel, month/chunk date helpers, clickOpensPicker,
and the weatherType summary (dsr-aware; the day page just omits dsr).
- nav.js: wrapped in an IIFE — its ~15 top-level functions were globals in
the shared classic-script scope, and a leaked locHash collided with page
destructuring (caught by the browser smoke, not by node --check).
locHash is now exported and used by all 8 former hand-built hash sites.
- mappicker.js: initFindButton/setFindLabel replace the Find-button block
each page rebuilt.
- legend.html renders its scales from the shared tables, so the guide can
no longer drift from what the app shows.
Verified: node --check on all JS; 108 backend tests; headless-Chromium
smoke over all five pages against live data — no console/page errors,
legend rows 9/9, weekly 7 cards + colored chart/key/table + metric toggle,
calendar grid + key + metric switch, day 7 ladders + weather icon,
compare seeded rank card.
2026-07-11 20:21:48 +00:00
// The scale rows come from the shared tier tables, so this guide can't
// drift from what the app actually shows.
Convert the frontend to ES modules; split nav.js by concern (#48)
The frontend was classic scripts sharing one global scope, with a
load-order contract enforced only by comments (leaflet -> nav ->
shared -> mappicker -> page) and hand-rolled window.Thermograph /
window.LocationPicker namespaces. Page scripts now import what they use;
the dependency graph replaces the ordering contract, and no app globals
remain (Leaflet stays a classic script / global L, loaded first).
nav.js had grown four concerns; it's now three single-purpose modules:
- nav.js: last-location memory + header view-links + locHash.
- units.js: the °F/°C toggle and unit-aware formatting. The compare
special case is gone — pages that want the toggle import units.js;
compare simply doesn't.
- cache.js: the IndexedDB response cache, SWR getJSON, bundle-seeded
view prefetch and neighbor warming. prefetchViews(lat, lon, ownViews)
now takes the calling page's own view names instead of a page-identity
map (VIEW_OWN) — adding a page no longer means editing this module.
The slice->URL map stays here as bundle-contract knowledge.
frontend/package.json ({"type": "module"}) makes CI's node --check
parse the files as modules.
Verified: node --check on all files as modules; 108 backend tests;
headless-Chromium smoke across all five pages against live data — zero
console/page errors, all render assertions pass (cards, chart, calendar
grid + metric switch, ladders, compare ranking, legend scales).
2026-07-11 20:28:33 +00:00
import { SCALE_TEMP, SCALE_RAIN } from "./shared.js";
Extract shared.js: one home for tier colors, scales, formatters, helpers (#47)
The page scripts each re-declared the shared presentation layer — the tier
color table existed in four places (app.js, calendar.js, day.js, style.css)
and the scale label tables in three (plus legend.html's own drifting copy),
alongside per-page copies of the dryness ramp, formatters, ord, todayISO,
esc, the weather icons/summary, month helpers and the 2-year range chunker.
~240 duplicated lines deleted (net -236 with the new module included).
- frontend/shared.js (IIFE, extends window.Thermograph): tier colors read
from style.css's :root custom properties at load — the CSS is now the
single source of truth; the JS map exists only because inline-SVG work
(chart + PNG export) needs literal values, with hex fallbacks for a
missing stylesheet. Plus SCALE_TEMP/SCALE_RAIN, drynessColor, fmt*, ord,
todayISO, esc, placeLabel, month/chunk date helpers, clickOpensPicker,
and the weatherType summary (dsr-aware; the day page just omits dsr).
- nav.js: wrapped in an IIFE — its ~15 top-level functions were globals in
the shared classic-script scope, and a leaked locHash collided with page
destructuring (caught by the browser smoke, not by node --check).
locHash is now exported and used by all 8 former hand-built hash sites.
- mappicker.js: initFindButton/setFindLabel replace the Find-button block
each page rebuilt.
- legend.html renders its scales from the shared tables, so the guide can
no longer drift from what the app shows.
Verified: node --check on all JS; 108 backend tests; headless-Chromium
smoke over all five pages against live data — no console/page errors,
legend rows 9/9, weekly 7 cards + colored chart/key/table + metric toggle,
calendar grid + key + metric switch, day 7 ladders + weather icon,
compare seeded rank card.
2026-07-11 20:21:48 +00:00
const row = ({ c, label, range }) =>
`< div class = "guide-seg" > < span class = "guide-sw" style = "background:var(--${c})" > < / span > ` +
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`< span class = "guide-lbl" > ${label}< / span > < span class = "guide-rng" > ${range}< / span > < / div > `;
Extract shared.js: one home for tier colors, scales, formatters, helpers (#47)
The page scripts each re-declared the shared presentation layer — the tier
color table existed in four places (app.js, calendar.js, day.js, style.css)
and the scale label tables in three (plus legend.html's own drifting copy),
alongside per-page copies of the dryness ramp, formatters, ord, todayISO,
esc, the weather icons/summary, month helpers and the 2-year range chunker.
~240 duplicated lines deleted (net -236 with the new module included).
- frontend/shared.js (IIFE, extends window.Thermograph): tier colors read
from style.css's :root custom properties at load — the CSS is now the
single source of truth; the JS map exists only because inline-SVG work
(chart + PNG export) needs literal values, with hex fallbacks for a
missing stylesheet. Plus SCALE_TEMP/SCALE_RAIN, drynessColor, fmt*, ord,
todayISO, esc, placeLabel, month/chunk date helpers, clickOpensPicker,
and the weatherType summary (dsr-aware; the day page just omits dsr).
- nav.js: wrapped in an IIFE — its ~15 top-level functions were globals in
the shared classic-script scope, and a leaked locHash collided with page
destructuring (caught by the browser smoke, not by node --check).
locHash is now exported and used by all 8 former hand-built hash sites.
- mappicker.js: initFindButton/setFindLabel replace the Find-button block
each page rebuilt.
- legend.html renders its scales from the shared tables, so the guide can
no longer drift from what the app shows.
Verified: node --check on all JS; 108 backend tests; headless-Chromium
smoke over all five pages against live data — no console/page errors,
legend rows 9/9, weekly 7 cards + colored chart/key/table + metric toggle,
calendar grid + key + metric switch, day 7 ladders + weather icon,
compare seeded rank card.
2026-07-11 20:21:48 +00:00
document.getElementById("temp-scale").innerHTML = SCALE_TEMP.map(row).join("");
document.getElementById("rain-scale").innerHTML = SCALE_RAIN.map(row).join("");
2026-07-11 00:29:47 +00:00
< / script >
< / body >
< / html >
