Hola.
Gracias jantoni. He hecho lo que me has dicho pero no hace caso sigue saliendo la plantilla y el index.html igual y de hecho en skin.conf me aparecen las unidades en US:
[[Groups]]
# For each group of measurements, this section sets what units to
# use for it.
# NB: The unit is always in the singular. I.e., 'mile_per_hour',
# NOT 'miles_per_hour'
group_altitude = foot # Options are 'foot' or 'meter'
group_degree_day = degree_F_day # Options are 'degree_F_day' or 'degree_C_day'
group_direction = degree_compass
group_moisture = centibar
group_percent = percent
group_pressure = inHg # Options are 'inHg', 'mmHg', 'mbar', or 'hPa'
group_radiation = watt_per_meter_squared
group_rain = inch # Options are 'inch', 'cm', or 'mm'
group_rainrate = inch_per_hour # Options are 'inch_per_hour', 'cm_per_hour', or 'mm_per_hour'
group_speed = km_per_hour # Options are 'mile_per_hour', 'km_per_hour', 'knot', or 'meter_per_second'
group_speed2 = km_per_hour2 # Options are 'mile_per_hour2', 'km_per_hour2', 'knot2', or 'meter_per_second2'
group_temperature = degree_F # Options are 'degree_F' or 'degree_C'
Es como si no hiciera caso de skin.conf.
Entonces he deshecho éste cambio y he ido a modificar el archivo weewx.conf, en el apartado StdReport, y allí las unidades son exactamente las que me salen en las plantillas (meteoclimatic.htm e index.html) pero si modifico aquí meter_per_hour por km_per_hour entonces no me genera las citadas plantillas (meteoclimatic.htm e index.html), hay algo que le provoca confusión:
[StdReport]
# Where the skins reside, relative to WEEWX_ROOT
SKIN_ROOT = /etc/weewx/skins
# Where the generated reports should go, relative to WEEWX_ROOT
HTML_ROOT = /var/www/weewx
# The database binding indicates which data should be used in reports.
data_binding = wx_binding
# Each of the following subsections defines a report that will be run.
[[StandardReport]]
# See the customizing guide to change the units, plot types and line
# colors, modify the fonts, display additional sensor data, and other
# customizations. Many of those changes can be made here by overriding
# parameters, or by modifying templates within the skin itself.
# The StandardReport uses the 'Standard' skin, which contains the
# images, templates and plots for the report.
skin = Standard
[[[Units]]]
[[[[Groups]]]]
group_altitude = meter
group_speed2 = meter_per_second2
group_pressure = mbar
group_rain = mm
group_rainrate = mm_per_hour
group_temperature = degree_C
group_degree_day = degree_C_day
group_speed = meter_per_second
Por tanto, si lo modifico en skin.conf no me hace caso, y si lo modifico en weewx.conf no me genera las plantillas.
Sigo investigando...