The average temperature of Kabul is given as 15^\circ C. The population of average city temperature lower than that of Kabul is

15 - 19.7 = -4.7 relative to the mean.

This is -\frac{4.7}{2} = -2.35 standard deviations relative to the mean.

This is Kabul's average temperature z-score.

We want to find the proportion of average city temperature below -2.35.

So, 0.0094 proportion of average city temperatures are lower than that of Kabul.

I found an answer from demonstrations.wolfram.com

Wolfram Demonstrations Project

Construct a Triangle ABC Given the Length of AB, the Angle at **C** and the Sum of
the Other ... **7**. Construct a Triangle Given the Lengths of **Two** Sides and a
**Median** of the Third Side ... Applying the Iota-Delta Numerical Function to
Describe **Normal** and ... Approximate Bubble **Temperature Distribution for**
Benzene, Toluene, ...

For more information, see Wolfram Demonstrations Project

I found an answer from large.stanford.edu

Planting Healthy Air

The **21st** century will be the urban century, as more than **2** billion additional ... the
**median** cost-effectiveness of street tree planting across sites, while its **error** bars
... **Average annual** maximum **temperature** (˚**C**) **for** the period from 1960 to 1990.
This period is often used as a reference period **for** “**normal**” **temperatures** before.

For more information, see Planting Healthy Air