Add a dynastic rule, entitled Weather, as follows:

The weather, at any given date time, will be the weather for [CITY] for the same date and time as reported at the website weather.com.  The sunrise and sunset on any given date will occur on at the times stated at weather.com for [CITY] on that date.

If the Narrator casts a vote on this proposal and specifies, in the post containing the vote, the name of a city for which weather forecasts and reports are available at weather.com, then subsitute that city for the [CITY] text in the rule.  If the Narrator does not do so, then [CITY] shall be London, United Kingdom.