I'm going to assume you are speaking about the characteristics of weather.
Here they are:
Humidity
Air Temperature and Pressure
Wind Speed/Direction
Cloud Cover and what kind of clouds.
Also the amount of precipitation as well as what effects the different kind of weather phenomenon to change into e.g. Freezing rain, Hail, Straight Line winds, etc.
Answer:
206 kj of heat is required to boil 78.5 kg of water at its boiling point
Low presser,
convection
that would be the anwser
Given the population of city = 150,000 people
Volume of water consumed by each person = 660.0 L
Total volume consumed in the city every year = *=/year
The required fluoride concentration is 1.0 ppm
1.0 ppm means 1.0 mg fluoride per liter of water
Calculating the mass of NaF that must be added in kg:
=
that's the answer I think