Grade 7 Social Studies NATURAL AND HISTORIC BUILT ENVIRONMENTS IN AFRICA – Weather Notes
Weather is the daily atmospheric conditions of a place at a particular time.
ELEMENTS OF WEATHER
- Temperature
Measure or degree of hotness or coldness of a place
- Humidity
The amount of water vapour or moisture in the atmosphere
- Precipitation
All forms of moisture which fall from the atmosphere to the earth’s surface
Rainfall is a form of precipitation formed from clouds that in form of water droplets
- Atmospheric pressure
- Wind
Moving air on the surface of the earth
- Sunshine
Direct rays of sunlight on the surface of the earth
- Cloud cover
Mass of tiny droplets of water or ice formed through condensation
Analysis and interpretation of weather conditions
Diurnal/daily Temperature range
-Difference between the maximum and minimum temperature for any one day.
Mean Daily Temperature
-Average of the maximum and the minimum daily temperatures.
Mean Monthly temperature
-Sum of mean daily temperatures in a month divided by the number of days in that month.
Mean Monthly minimum Temperature
-Sum of daily minimum temperatures divided by the number of days in that month.
Mean Monthly Maximum Temperature
-Sum of daily maximum temperatures divided by the number of days in that month.
Mean Annual Temperature
-Sum of mean monthly temperatures divided by 12.
Mean Annual Temperature Range
-Difference between the highest and the lowest mean monthly temperatures in a year.
Monthly Rainfall Total
-Sum of rainfall recorded in a month.
Annual Rainfall Total
-Sum of monthly rainfall totals for 12 months.
Mean Monthly Rainfall
-Sum of rainfall totals for a particular month over several years divided by the number of the years of observation.
Mean Annual Rainfall
-Sum of mean monthly rainfall for 12 months of the year.
Factors to consider when siting a weather station
Weather Station
–A place where observation, measuring and recording of weather elements is done