The norm for this month is 45.7 millimetres, including about 5 centimetres of snow. This year's Environment Canada measurements are varying, but they're running between 0.8 and 1.2 millimetres, and as spokesman Chris Emond just confirmed this morning, this could end up being the driest July through September period in this area on record.
"We're on target to have the lowest three month sort of summer total of precipitation on record, so July, August and September. 45.9 is the current three month total, and the previous record set in 1945 was 55.9 so there's still 10 millimetres to go."
By further comparison, in the first 12 years of the new century the airport weather station has recorded more than 50 millimetres in September five times, with the top mark in 2004 at 12.6.