Trader consensus on Polymarket heavily favors a high of 8°C (38.5% implied probability) for Toronto on April 19, closely tracking the latest Environment and Climate Change Canada (ECCC) forecasts projecting daytime highs of 6–9°C amid a cold snap. This positioning stems from a recent influx of cool maritime air following heavy showers on April 18—totaling 10–15 mm—that dropped overnight lows near 3°C and suppressed warming via persistent cloud cover and 30% chances of rain showers or flurries. Upper-level troughing over the Great Lakes limits solar heating and convective potential, aligning with spring climatology where April highs average 12°C but vary widely. Model ensembles show low confidence in exceeding 10°C due to these synoptic patterns, with final observational data from Toronto Pearson International Airport expected to resolve the market; watch ECCC updates this afternoon for potential refinements.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedHighest temperature in Toronto on April 19?
Highest temperature in Toronto on April 19?
8°C 39%
7°C 23%
9°C 22%
10°C or higher 10%
$17,853 Vol.
$17,853 Vol.
0°C or below
<1%
1°C
<1%
2°C
<1%
3°C
<1%
4°C
1%
5°C
3%
6°C
9%
7°C
23%
8°C
39%
9°C
22%
10°C or higher
10%
8°C 39%
7°C 23%
9°C 22%
10°C or higher 10%
$17,853 Vol.
$17,853 Vol.
0°C or below
<1%
1°C
<1%
2°C
<1%
3°C
<1%
4°C
1%
5°C
3%
6°C
9%
7°C
23%
8°C
39%
9°C
22%
10°C or higher
10%
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the Toronto Pearson Intl Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/ca/mississauga/CYYZ.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve to "Yes" until all data for this date has been finalized.
The resolution source for this market measures temperatures to whole degrees Celsius (eg, 9°C). Thus, this is the level of precision that will be used when resolving the market.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
Market Opened: Apr 17, 2026, 12:05 AM ET
Resolution Source
https://www.wunderground.com/history/daily/ca/mississauga/CYYZResolver
0x69c47De9D...The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the Toronto Pearson Intl Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/ca/mississauga/CYYZ.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve to "Yes" until all data for this date has been finalized.
The resolution source for this market measures temperatures to whole degrees Celsius (eg, 9°C). Thus, this is the level of precision that will be used when resolving the market.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
Resolution Source
https://www.wunderground.com/history/daily/ca/mississauga/CYYZResolver
0x69c47De9D...Trader consensus on Polymarket heavily favors a high of 8°C (38.5% implied probability) for Toronto on April 19, closely tracking the latest Environment and Climate Change Canada (ECCC) forecasts projecting daytime highs of 6–9°C amid a cold snap. This positioning stems from a recent influx of cool maritime air following heavy showers on April 18—totaling 10–15 mm—that dropped overnight lows near 3°C and suppressed warming via persistent cloud cover and 30% chances of rain showers or flurries. Upper-level troughing over the Great Lakes limits solar heating and convective potential, aligning with spring climatology where April highs average 12°C but vary widely. Model ensembles show low confidence in exceeding 10°C due to these synoptic patterns, with final observational data from Toronto Pearson International Airport expected to resolve the market; watch ECCC updates this afternoon for potential refinements.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated
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