The Animal Protection Institute showed that even moderately warm temperatures
outside can quickly lead to deadly temperatures inside a closed car.
The study, conducted during a local heat wave, compared an outside temperature of a shaded area with the inside of
an automobile in three states: fully closed, with four windows cracked,
and with two windows cracked. Inside temperatures were measured with an
indoor/outdoor thermometer and an oven thermometer (both readings are given).
All temperatures use the Fahrenheit scale.
Day 1
|
Outside Temperature
|
Inside Closed Automobile
|
|
|
Indoor/Outdoor
|
Oven Thermometer
|
| 9:00 am
|
82°
|
109°
|
---- |
| 9:30 am
|
87°
|
115°
|
---- |
| 10:00 am
|
91°
|
115°
|
---- |
| 10:30 am
|
94°
|
114°
|
115°
|
| 11:00 am
|
98°
|
114°
|
119°
|
| 11:30 am
|
100°
|
117°
|
124°
|
| 12:00 pm
|
101°
|
119°
|
127°
|
| 1:30 pm
|
112°
|
124°
|
130°
|
| 2:30 pm
|
125°
|
130+°
|
159°
|
| 4:00 pm
|
98°
|
110°
|
110°
|
Day 2
|
Outside Temperature
|
Inside Auto - 4 Windows Cracked
|
|
|
Indoor/Outdoor
|
Oven Thermometer
|
| 9:15 am
|
84°
|
98°
|
98°
|
| 10:00 am
|
88°
|
103°
|
105°
|
| 10:30 am
|
90°
|
108°
|
108°
|
| 11:00 am
|
92°
|
109°
|
109°
|
| 12:00 pm
|
95°
|
113°
|
113°
|
| 1:00 pm
|
101°
|
114°
|
115°
|
| 2:00 pm
|
110°
|
123°
|
120°
|
| 3:40 pm
|
112°
|
129°
|
128°
|
| 4:00 pm
|
115°
|
132°
|
130°
|
Day 3
|
Outside Temperature
|
Inside Auto - 2 Windows Cracked
|
|
|
Indoor/Outdoor
|
Oven Thermometer
|
| 8:30 am
|
72°
|
72°
|
72°
|
| 9:30 am
|
80°
|
95°
|
95°
|
| 12:00 pm
|
88°
|
105°
|
105°
|
| 1:50 pm
|
99°
|
109°
|
109°
|
| 2:30 pm
|
104°
|
120°
|
120°
|
| (both thermometers showed identical readings)
|
Other studies show similar results:
- San Francisco State University
- April 2007 fact sheet utilizing data from a Golden Gate Weather Services
study
- Another
study reprinted from the Journal of the Louisiana State Medical Society
- A
study from Stanford University shows that even on comparatively cool
days, such as 72 degrees, a car's internal temperature will rocket to
116 degrees within 60 minutes. And keeping the windows open a
crack hardly slows the rise at all.
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