Thermograph monorepo: graded-climate API + SSR frontend + infra, domain-specific containerized deploys
Find a file
Emi Griffith 5a921cf01d Default climate pages to the city's own temperature unit (#189)
Search Console shows impressions skewing hard to °C countries — India, South
Africa, New Zealand, the UK, Australia — while every climate page rendered °F
into the HTML. Search snippets quote the server-rendered text, so a reader in
Delhi saw a temperature they had to convert in their head before the page was
worth a click.

Climate pages now render temperatures in the city's country convention: °F for
the US and the handful of other Fahrenheit countries, °C everywhere else. This
happens server-side, so it holds with no JS and shows up in the snippet.

data-temp-f keeps the raw Fahrenheit in every case — it stays the conversion
source of truth, and climate.js repaints from it on toggle exactly as before.
The visitor's stored choice still wins over everything; the page default only
sits between that and the locale guess, so a first-time visitor stops seeing a
°F→°C repaint on load for the majority of our traffic.

The unit rides on a ContextVar rather than a parameter because _temp() is
reached from both directions — templates call it as a Jinja global, and the
context builders call it directly to pre-render the records tables into strings.
Threading an argument would mean touching ~20 call sites across three levels of
nesting, where missing one yields a silently wrong unit instead of an error. The
scope wraps the context builder as well as the render, since the builder is
evaluated as an argument and runs first, and it resets in a finally: the page
handlers are sync `def`, so Starlette runs them on a recycled threadpool thread
and a value left set would leak into the next request that thread serves.

Conversion rounds half-up to match JS's Math.round rather than Python's
round-half-to-even, so the server prints the number climate.js would and there
is no flicker on load for a visitor whose unit already matched.

Pages with no single city — the homepage strip, the hub, the interactive views —
set no scope, emit no data-unit-default, and keep today's locale behaviour.

Precipitation, wind and humidity stay imperial; that inconsistency is worth a
follow-up but is outside this change.

Two existing assertions were passing for the wrong reason: base.html.j2 mentions
"°F/°C" in an HTML comment, so a bare `"°F" in html` check succeeded even on a
page whose every temperature was Celsius. They now read the rendered spans.

Claude-Session: https://claude.ai/code/session_013dRZmX9D3JEntfMKWMTWZ8
2026-07-19 18:25:55 +00:00
templates Default climate pages to the city's own temperature unit (#189) 2026-07-19 18:25:55 +00:00
tests Default climate pages to the city's own temperature unit (#189) 2026-07-19 18:25:55 +00:00
api_accounts.py Push: surface delivery failures (no longer a silent success) (#157) 2026-07-17 00:12:14 +00:00
app.py Rebuild the homepage as a distribution landing; add an SMTP seam (#178) 2026-07-18 07:39:47 +00:00
audit.py Dashboard: accounts totals only; log client IPs per request (#140) 2026-07-16 21:58:40 +00:00
cities.json SEO: values filter — trim cities in anti-LGBTQ countries, keep notable hubs (#102) 2026-07-16 02:20:41 +00:00
cities.py Lead climate page titles with the city and the payload (#188) 2026-07-19 18:17:13 +00:00
cities_flavor.json SEO: values filter — trim cities in anti-LGBTQ countries, keep notable hubs (#102) 2026-07-16 02:20:41 +00:00
city_events.py SEO: broaden curated weather events beyond the US/Anglosphere (#101) 2026-07-16 01:42:49 +00:00
climate.py Rebuild the homepage as a distribution landing; add an SMTP seam (#178) 2026-07-18 07:39:47 +00:00
content.py Default climate pages to the city's own temperature unit (#189) 2026-07-19 18:25:55 +00:00
db.py Fix mobile alerts dropdown overflow; add account API tests (#93) 2026-07-15 22:00:47 +00:00
digest.py Rebuild the homepage as a distribution landing; add an SMTP seam (#178) 2026-07-18 07:39:47 +00:00
gen_cities.py SEO: values filter — trim cities in anti-LGBTQ countries, keep notable hubs (#102) 2026-07-16 02:20:41 +00:00
gen_flavor.py SEO: expand city set to 1000 (extended English-speaking / high-proficiency) (#99) 2026-07-16 01:14:30 +00:00
grading.py Render every percentile through one rule (#186) 2026-07-18 09:08:28 +00:00
grid.py Warm neighbor cells server-side (/cell?neighbors=1) (#51) 2026-07-11 20:47:31 +00:00
homepage.py Render every percentile through one rule (#186) 2026-07-18 09:08:28 +00:00
indexnow.py Auto-submit IndexNow on deploy when the URL set changes (#130) 2026-07-16 13:38:59 -07:00
mailer.py Rebuild the homepage as a distribution landing; add an SMTP seam (#178) 2026-07-18 07:39:47 +00:00
metrics.py Rebuild the homepage as a distribution landing; add an SMTP seam (#178) 2026-07-18 07:39:47 +00:00
migrate.py Migrate backend dataframe layer from pandas to polars (#90) 2026-07-15 19:07:38 +00:00
models.py Rebuild the homepage as a distribution landing; add an SMTP seam (#178) 2026-07-18 07:39:47 +00:00
notify.py Rebuild the homepage as a distribution landing; add an SMTP seam (#178) 2026-07-18 07:39:47 +00:00
places.py Move the suggestion policy into places.py (#45) 2026-07-11 20:00:24 +00:00
push.py Push: surface delivery failures (no longer a silent success) (#157) 2026-07-17 00:12:14 +00:00
requirements-dev.txt Add backend test suite; gate direct pushes; serialize LAN deploys (#41) 2026-07-11 19:37:49 +00:00
requirements.txt SEO: crawlable programmatic climate pages + technical hygiene (#96) 2026-07-15 23:53:11 +00:00
schemas.py Add PWA + Web Push delivery for weather alerts (#95) 2026-07-15 23:21:06 +00:00
singleton.py Gate the subscription notifier to one worker (#161) 2026-07-17 12:54:55 +00:00
store.py Compare/calendar mobile polish: overflow fix, sheet load button, 6-yr default, country in names (#80) 2026-07-12 06:32:10 +00:00
users.py Account system with weather-notification subscriptions (#89) 2026-07-15 18:46:46 +00:00
views.py Migrate backend dataframe layer from pandas to polars (#90) 2026-07-15 19:07:38 +00:00
warm_cities.py Rebuild the homepage as a distribution landing; add an SMTP seam (#178) 2026-07-18 07:39:47 +00:00