**** Info via Environment Canada
May Temperature Outlook
Weather in April can always be unpredictable. A ridge of high pressure brought above-normal temperatures in Southern Ontario the second week of April. Windsor and Sarnia reported daily maximum temperatures of 20 °C right before a spring snowstorm hit southeastern Saskatchewan, southern Manitoba and northern Ontario, bringing 20 – 40 cm of snow.
As the storm moved eastward, parts of Ontario and Quebec reported wind gusts of 80 – 120 km/h, while cold air settled into western Canada on April 17th. Many minimum temperatures reached as low as -15 to -20 °C from Yukon to Manitoba, breaking daily minimum temperature records. The cities of Emmerson and Morden, in Manitoba, both recorded their rainiest ever month of April, since records started. The Maritimes also received their fair share of rain on April 19th, with widespread 30 – 70 mm of rain reported that day.
Here is the forecast for the “temperature anomaly” for the month of May. The temperature anomaly is the “difference from normal temperatures” for the entire month.
The forecasts are categorized as follows:
- blue indicates the probability that temperatures will be below normal;
- grey to purple indicates the probability that temperatures will be near normal; and
- yellow to red indicates the probability that temperatures will be above normal.
*All categories are compared to the 30 seasons of the 1991-2020 period.
This is a prediction of the anomaly of the mean daily temperature at 2 metres (i.e. at standard temperature observation height). It is not a forecast of the maximum nor of the minimum daily temperature.
Long range forecast user guide.
