Question
The table below represents the rainfall and temperature data of station Y for one year. Study it and answer the questions that follow:
(a) Calculate the following:
I) Annual temperature range
II) Mean monthly temperature
III) Annual Rainfall
(b) Draw a combined line and bar graph to represent the data.
(c) Describe the characteristics of the polygraph in (b) above.
| Month | Jan | Feb | Mar | April | May | June | July | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall(mm) | 5 | 10 | 33 | 40 | 60 | 100 | 75 | 40 | 30 | 15 | 5 | 5 |
| Temp | 23 | 24 | 25 | 27 | 27 | 29 | 28 | 27 | 26 | 25 | 24 | 24 |
(a) Calculate the following:
I) Annual temperature range
II) Mean monthly temperature
III) Annual Rainfall
(b) Draw a combined line and bar graph to represent the data.
(c) Describe the characteristics of the polygraph in (b) above.
Answer
(a)
I) Annual temperature range
Maximum temp - Minimum temp
29°c - 23°c = 6°c
II) Mean monthly temperature
Maximum temp + minimum temp 29°c + 23°c =26°c
III) Annual Rainfall
5 + 10 + 33 + 40 + 60+ 100 + 75 + 40 + 30 + 15 + 5 + 5 = 418mm
(b) Draw a polygraph to represent the data On the graph paper.
(c)
- There is rainfall throughout the year.
- There is one rainfall maxima: from March to September
- Temperatures are high throughout the year
- Mean annual rainfall is low about (418mm)
- Mean annual range of temperature is small about 6°c
- The amount of rainfall increases with the increase of temperature
- The wettest month is June
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