ICSE-IX-Geography
13: Insolation
- #4Define the following :
(a) Daily Mean Temperature.
(b) Monthly Mean Temperature.
(c) Annual Mean Temperature.
(d) Mean Temperature of a place.Ans : (a) Daily Mean Temperature — The average of the maximum temperature and minimum temperature recorded during a day (24 hours) is known as daily mean temperature.
Daily Mean Temperature
= (Max Temp. + Min. Temp.)/2
= (39° + 27°)/2
= 66°/2
= 33°C
For example, if a place has the maximum temperature of 39°C and minimum temperature of 27°C for a particular day, the daily mean temperature.
(b) Monthly Mean Temperature — The average of the daily mean temperature of all days of a month is known as monthly mean temperature.
Monthly mean temperature of July
= (Daily mean temperature 1 + 2 + 3 ...... 31 days)/31
(c) Annual Mean Temperature — The average of daily mean temperature of all days of a year is known as Annual mean temperature.
Annual mean temperature of year 2010
= (Daily mean temperature of 1 + 2 + 3 ......365)/365
(d) temperature of a place is obtained by collecting the data for a period of 30 - 40 years. The average of mean annual temperature of a place is calculated. This is also known as normal temperature of a place.
Mean temperature
= (Mean annual temp. of 1986 + 1985 ......... for 35 years)/35
Mental climate.