Better temp plot (#6)

* Update docs

* Improve meteogram plot

* Update README

Author: marhoy

README.md

@@ -10,8 +10,8 @@ Documentation is available on [Read the Docs](https://meteogram.readthedocs.io/)
 
 Examples:
 
-![Example 1](https://raw.githubusercontent.com/marhoy/meteogram/main/docs/images/example_meteogram.png)
+![Example 1](https://raw.githubusercontent.com/marhoy/meteogram/main/docs/images/meteogram_oslo.png)
 
-![Example 2](https://raw.githubusercontent.com/marhoy/meteogram/main/docs/images/example_meteogram_warm.png)
+![Example 2](https://raw.githubusercontent.com/marhoy/meteogram/main/docs/images/meteogram_snow.png)
 
-![Example 3](https://raw.githubusercontent.com/marhoy/meteogram/main/docs/images/example_meteogram_default.png)
+![Example 3](https://raw.githubusercontent.com/marhoy/meteogram/main/docs/images/meteogram_small.png)

docs/images/example_meteogram.png

@@ -9,16 +9,20 @@ meteogram is a graphical representation of meteorological data, typically used t
 display weather forecasts. The weather data is provided by the Norwegian Meteorological
 Institute (MET).
 
-Here's an example with some percipitation, mostly as rain. The different shades of blue
-for the percipitation bars indicate the probability of percipitation:
+Here's an example of a cold place with a bit of snow:
+![Cold meteogram](images/meteogram_cold.png)
 
-![Example meteogram](images/example_meteogram.png)
+Here's a place with more snow. The different shades of blue
+for the percipitation bars indicate the probability of percipitation:
+![Snow meteogram](images/meteogram_snow.png)
 
-For a more sunny and warm location, the meteogram might look like this:
+This is a place with temperatures on both sides of zero. Note that the color of the
+temperature line changes from blue to red when the temperature is above zero:
+![Zero meteogram](images/meteogram_oslo.png)
 
-![Example meteogram](images/example_meteogram_warm.png)
+Here's a warm place with mostly clear sky:
+![Warm meteogram](images/meteogram_warm.png)
 
 The default values generates a small meteogram with 24 hours of forecast data, suitable
 for inclusion in e.g. a Home Assistant dashboard:
-
-![Example meteogram](images/example_meteogram_default.png)
+![Small meteogram](images/meteogram_small.png)