The Gleaner
Weather Report

Châteauguay Valley Weather October 1-9, 2021

Peter Finlayson, Ormstown Weatherman

October has definitely started with a heat wave – relative to the time of the year, of course. The average temperature for the first nine days is 13.2° C. The previous week it had been 11.5° C, and the normal for the month is 9.4° C – so, almost four degrees above average.

Both day and nighttime temperatures have been above average and, for the coming week, nighttime “lows” will be very close to what would typically be the daytime high!

Of course, the warm weather kept the heat units (CHU) ticking along with no sign of a killing frost in sight. The first week and a couple of days of October brought in another 122 CHU, which means we’re already pretty close to the normal for the entire month at 146 CHU. The 2021 total (starting on May 10th) now sits at 3450 CHU, a clear indicator that it was a very warm summer overall (3300 CHU is normally considered the top end of the scale for this region).

After the deluge at the beginning of the month, there’s been very little precipitation in the past week. The meagre 0.4 mm of rain that fell brings the month’s total to 35.6 mm, which is about average. Neighbouring areas have not been so lucky, continuing the trend of variable precipitation within the region. Total rainfall for the same period in Ste-Anne-de-Bellevue was only 18 mm, 26.6 mm for Ste-Clothilde and 16.6 mm for L’Acadie.

On the plus side, it’s been great weather for the soybean harvest and other field work. There are even a few fields where farmers have started taking off grain corn. Some alfalfa fields are so green you would think it was May!

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