0°G
0 °C · 32 °F
Water's familiar freezing reference.
Education
Learn °G
The fastest way to learn a temperature scale is to attach numbers to experiences you already know.
Anchor points
Start with a handful of numbers.
These are illustrative reference points, not extra definitions of the scale. The formal definition for numerical readings is TG = 2TC.
40°G
20 °C · 68 °F
A common room-temperature reference.
50°G
25 °C · 77 °F
A pleasantly warm day for many people.
60°G
30 °C · 86 °F
Hot-weather territory.
74°G
37 °C · 98.6 °F
The familiar nominal human body-temperature reference.
100°G
50 °C · 122 °F
Extreme outdoor heat.
Count the steps
One physical range, three ways to number it.
From freezing to 40 °C / 104 °F / 80 °G, nothing physical changes. Only the scale markings do.
Celsius40whole-degree intervals
Fahrenheit72whole-degree intervals
Galliera80whole-degree intervals
Remember: more whole-number intervals means finer numbering, not more physical information. Measurement precision still depends on the instrument.
Four-season intuition
Weather in Galliera.
These broad bands are illustrative for temperate four-season climates. They intentionally overlap; seasons are not discrete temperature bins.
Winter · −10 to 30 °G
−5 to 15 °C · 23 to 59 °F
−20040100 °G
Spring / Autumn · 10 to 50 °G
5 to 25 °C · 41 to 77 °F
−20040100 °G
Summer · 40 to 90 °G
20 to 45 °C · 68 to 113 °F
−20040100 °G
Latitude, elevation, humidity, continentality and local climate can shift these ranges substantially.
Thermostats
Count by ones instead of halves.
This is the everyday interface argument in its simplest form.
4020.0°C
4120.5°C
4221.0°C
4321.5°C
4422.0°C
4522.5°C
Practice
Think in °G.
A few quick exercises make the factor-of-two relationship automatic.
20 °C = ? °G
40 °G
43 °G = ? °C
21.5 °C
30 °C = ? °G
60 °G