Ensemble weather models from Environment Canada, ECMWF, and GFS drive the 71% implied probability for Toronto's highest temperature on March 27 reaching 3°C or higher, projecting daytime highs of 4–7°C amid a mild southerly flow displacing recent Arctic air. This aligns with late-March climatology, where Pearson Airport records average 6°C highs and sub-zero extremes occur in under 10% of cases, bolstered by current upper-air patterns showing ridge amplification over eastern North America. Recent 00Z model runs refined upward from prior cooler biases, with hourly guidance indicating peaks near 5°C around 2–4 PM ET; traders price in low risk of colder outliers below 2°C given dewpoint recoveries above freezing. Watch 12Z updates Thursday for final tweaks ahead of resolution.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Toronto on March 27?
Highest temperature in Toronto on March 27?
3°C or higher 72%
2°C 16%
1°C 9.8%
0°C 3.2%
-7°C or below
1%
-6°C
1%
-5°C
<1%
-4°C
1%
-3°C
2%
-2°C
1%
-1°C
3%
0°C
3%
1°C
10%
2°C
16%
3°C or higher
72%
3°C or higher 72%
2°C 16%
1°C 9.8%
0°C 3.2%
-7°C or below
1%
-6°C
1%
-5°C
<1%
-4°C
1%
-3°C
2%
-2°C
1%
-1°C
3%
0°C
3%
1°C
10%
2°C
16%
3°C or higher
72%
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: Mar 23, 2026, 6:02 AM ET
Resolution Source
https://www.wunderground.com/history/daily/ca/mississauga/CYYZResolver
0x69c47De9D...Resolution Source
https://www.wunderground.com/history/daily/ca/mississauga/CYYZResolver
0x69c47De9D...Ensemble weather models from Environment Canada, ECMWF, and GFS drive the 71% implied probability for Toronto's highest temperature on March 27 reaching 3°C or higher, projecting daytime highs of 4–7°C amid a mild southerly flow displacing recent Arctic air. This aligns with late-March climatology, where Pearson Airport records average 6°C highs and sub-zero extremes occur in under 10% of cases, bolstered by current upper-air patterns showing ridge amplification over eastern North America. Recent 00Z model runs refined upward from prior cooler biases, with hourly guidance indicating peaks near 5°C around 2–4 PM ET; traders price in low risk of colder outliers below 2°C given dewpoint recoveries above freezing. Watch 12Z updates Thursday for final tweaks ahead of resolution.
Experimental AI-generated summary referencing Polymarket data · Updated
Beware of external links.
Beware of external links.
Frequently Asked Questions