Canberra may enjoy its first morning of the season above zero degrees tomorrow. The nation's capital city has plunged below freezing on each of the last eight mornings, getting as low as -5.1 degrees last Friday. This freezing transition into winter may end tomorrow though, with a forecast low of one degree. This is right on average for this time of year. Similar lows of around one degree are forecast on Thursday and Friday. However, if the city does manage to stay above zero for the next three days, it won't last into the weekend. The mercury is likely to drop back into negative territory on Saturday and Sunday mornings.