<Tr> <Td> J </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> J </Td> <Td> J </Td> <Td> </Td> <Td> </Td> <Td> O </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 2.1 31 18 </Td> <Td> 1.9 35 21 </Td> <Td> 2.7 47 31 </Td> <Td> 3.6 59 42 </Td> <Td> 4.1 70 52 </Td> <Td> 4.1 80 62 </Td> <Td> 84 68 </Td> <Td> 82 66 </Td> <Td> 3.3 75 58 </Td> <Td> 3.2 63 46 </Td> <Td> 3.4 49 35 </Td> <Td> 2.6 35 22 </Td> </Tr> <Tr> <Td_colspan="12"> Average max. and min . temperatures in ° F </Td> </Tr> <Tr> <Td_colspan="12"> Precipitation totals in inches </Td> </Tr>

What is the lowest temperature ever recorded in chicago