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These are the properties that I have found:
(and I know the viscosity is nearly meaningless for cold temperatures, but it gives a general idea of why acetone is promising)

1) Thermal Conductivity (W/m·K)
2) Thermal Capacity (J/(kg K))
3) Dynamic viscosity (m·10^6) (Pa.s)
4) Melting temp (C)
5) Boiling temp (C)
6) Density (kg/m^3)
7) Surface tension (N/m)
8) Flash Point (C)
9) Auto Ignition (C)

Acetone
1) 0.18
2) 2150
3) 330
4) -95
5) 56
6) 791
7) 0.024
8) -18
9) 465

Ethanol
1) 0.18
2) 2840
3) 1194
4) -117
5) 79
6) 790
7) 0.023
8) 12
9) 425

Methanol
1) 0.21
2) 2510
3) 593
4) -98
5) 65
6) 791
7) 0.023
8) 10
9) 455

Water
1) 0.60
2) 4180
3) 1000
4) 0
5) 100
6) 998
7) 0.073
8) ?
9) ?

As far as flamability it seems that it's about the same as methanol and ethanol from the data.