Nunavut (northern Canada) was the coldest Province/Territory in May.
Environment Canada calculates “Normals” for a subset of stations. Those are the anomalies from the 1971-2000 average.
The following barplots are of the daily anomalies (TMax and TMin) for each Nunavut station (that have Normals) averaged together.
The coldest part of the month was 6 to 7C below the 1971-2000 average. So much for the overheating Arctic.