The Gleaner
Weather Report

Chateauguay Valley weather report May 19-25, 2024

May has warmed up considerably since the beginning of the month, with both daytime highs and nighttime lows being much higher than forecast. And what was looking like a very wet spring has turned into a very dry month.

The average temperature jumped another degree and a half during the third week of the month, up from 14.5 degrees Celsius to 16.0 C. The normal for the entire month is 14.3 C. The increase came from an unforeseen mini heat wave that brought daytime temperatures close to the 30 C mark, and reached 32 C on May 22.

Despite the warm temperatures, there was a significant dip on the early morning of May 25 when the thermometer dropped to 6 C, and was 2 C at ground level. No frost, but too close for comfort.

With corn planting well underway, the annual heat unit count (CHU) has started as of May 19. After only a week there are 165 CHU on the books, which is a good beginning even though the late start to the CHU count will mean that the normal for May (408 CHU) won’t be reached this year.

Despite this, some corn has already sprouted, as quickly as just six days after planting. The warm soil temperatures and abundant sub-surface moisture have been key factors.

There was only 8 millimetres of rain in the last week daily, bringing the month-to-date total to 48 mm, which is well below normal (70 mm). The dry weather has meant that farmers have also started cutting and baling haylage, which is an early start to the season as well.

The forecast for the last week of the month calls for normal daytime highs and nighttime lows, with a few days of showers expected – maybe even some rain – around mid-week.

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