Chapter 1 GENERAL FEATURES OF PUNE DISTRICT

1.4.2 Temperature and Humidity
i. Temperature Conditions
April and May are the hottest months in the district. Maximum temperature during these
months often rises above 36 o C. The Western region of Pune District i.e.Tal. Junnar,
Ambegaon, Khed, Maval, Mulshi and Velhe are cool, whereas the Eastern part i.e.
Tal.Shirur, Daund, Baramati and Indapur are hot and dry. December and January are
the coolest months, when average monthly temperature falls as low as 11.2 o C
(Annexure 1: Table 14).
ii. Range of Temperature
The daily range of temperatures is highest in the Eastern part of the district, where the
Summers are relatively hotter and winters relatively colder. From following Fig.13 it is
observed that, the daily range in temperature is the least during the month of July and
August. This is owing to the fact that the amount of solar radiation received in July is
relatively less as compared to April or May, due to cloud cover and also due to the
considerable loss of heat energy as wet surfaces get evaporated.
Thus, the daily temperature comes down and night temperature become steady, as
terrestrial heat is unable to escape due to the water vapor present in the atmosphere. In
Summer, the average temperature varies between 10.5 o C and 37.7 o C, whereas in
winter, it ranges from 11.2 o C to 30.9 o C.
iii. Humidity Conditions
Humidity is low during the Summer months due to increased evaporation losses from
the atmosphere. The diurnal variations in humidity during this period are high, water
vapor gets condensed due to falling nighttime temperatures and the daytime
temperatures are high.
Fig. 13 & Table 14 at Annexure-1 give details about humidity pattern within the district.
In the Summer months the relative humidity ranges from a minimum of 20% to
maximum of 67% during the day. During the monsoon period, the relative humidity
varies from 68% to 87%. The relative humidity during winter shows maximum diurnal
variation varying from 37% to 88%.
Figure 13. Annual Variations in Temperature and Humidity at Pune (2001)
Temperature (°C)
40
35
30
25
20
15
10
5
0
12
January
30.1
10.5
Februay
34.6
14.6
March
35
20.4
April
37.7
22.9
36.1
23.1
May
June
30.6
30.3 30.9 29.9
30.6
22
July
27.1
21.7
August
27.1
20.8
September
18.7
October
13.9
November
11.2
December
Minimum Temperature Maximum Temperature
Relative Humidity (%) at 08.30 hrs Relative Humidity (%) at 17.50 hrs
Source: Dy.Director-General, Regional Metrological Department, Pune (2001).
100
90
80
70
60
50
40
30
20
10
0
Relative Humidity (%)