## How the grades work

Every grade is relative to this place's own climate history, not an absolute temperature. For each day Thermograph builds a ±7-day seasonal distribution from decades of local records, then reports the percentile where the day falls in it.

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”.

## Grade scale: percentile of the local ±7-day history

## Rain intensity: percentile among rain days

Precipitation is graded only across days that actually saw rain, so “Heavy” means heavy for a rainy day here. Dry days are colored by their dry streak instead (below).

## The metrics

High / Low
  The day's highest and lowest air temperature (°F).
Feels
  Apparent temperature: what the air actually felt like once humidity 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.
Humid
  Absolute humidity: grams of water vapor per cubic meter of air (g/m³).
Wind
  Average sustained wind speed (mph).
Gust
  Peak wind gust for the day (mph).
Precip
  Total precipitation (inches), graded by intensity among rain days.
Dry streak
  Consecutive days since the last measurable rain; the color deepens the longer it's been dry, and resets to blue on a rain day.

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