A friend sent this to me years ago when I asked him what the conversions were. It is easily printable so that you can have it beside you as a reference, whereas I am not sure whether everyone's printers could handle the other "ruler" in the link? Thought it might help anyway. Also, there's a quick table of the USDA zones that he sent to me as well. It is amazing to me to look now and realise that it was nearly 5 years ago that I was sent these!! Where has the time gone. Cheers. Paul T. ************** Temperature equivalents. **************** Celsius Fahrenheit -45 -49 -40 -40 -35 -31 -30 -22 -25 -13 -20 - 4 -15 + 5 -10 14 -5 23 0 32 5 41 10 50 15 59 20 68 25 77 30 86 35 95 40 104 45 113 50 122 ************ USDA ZONES ***************** The USDA Zones are based on the average coldest temperature that could be expected to occur there during the winter. This is not based on the daily average, but instead is the coldest it would normally get in a whole year. The zones are based on a ten degree Fahrenheit spread in temperatures. Here it is: USDA Zone 1: -50 and colder. USDA Zone 2: -50 F to -40 F USDA Zone 3: -40 F to -30 F USDA Zone 4: -30 F to -20 F USDA Zone 5: -20 F to -10 F USDA Zone 6: -10 F to 0 F USDA Zone 7: 0 F to +10 F USDA Zone 8: 10 F to 20 F USDA Zone 9: 20 F to 30 F USDA Zone 10: 30 F to 40 F USDA Zone 11: 40 F or warmer.