Practical work: calculating temperature and pressure

In this practical lesson three tasks are done. 1) Mean daily temperature: add the 8 readings and divide by 8. 2) Annual amplitude: from the 12 months subtract the mean of the coldest month from that of the warmest month; to draw a temperature graph write temperature on the vertical line and the first letters of the months on the horizontal one, mark a point for each month and join the points. 3) Change with height: temperature falls 6 °C per 1000 m and pressure falls 10 mm Hg per 100 m. For example, if a plain has +30 °C and 740 mm Hg, at 1500 m the temperature is 30 – 6 × 1.5 = +21 °C (treat 1.5 as 15 : 10) and the pressure is 740 – 150 = 590 mm Hg. Write your calculations step by step in the notebook and check the answer.