Canada Summer Temperature Trends, 1900-2023: Part Deux
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Canada Summer Temperature Trends, 1900-2023: Part Deux
Summary
An improved method for merging weather station temperature data leads to revised temperature trends for the period 1900-2023 for the 6 largest southern provinces of Canada, compared to those I previously posted here and here. The general conclusions remain the same, but the details change somewhat. Because of the improved methodology, this post supersedes those posts. The main conclusions for the period 1900-2023 are:
- Southern Canada daily high summer temperatures [Tmax] have warmed at only 1/3 the rate of daily low temperatures [Tmin]: +0.06 and +0.18 C/decade, respectively;
- Averaged across southern Canada, 2021 and 1961 are the two hottest summers for daily high temperatures;
- Even though 2021 is the hottest for Tmax, none of the individual 6 provinces has 2021 as record warmest; and
- Tmax and Tmin trends are surprisingly uniform across those 6 provinces.
The “New” Methodology
In recent months I’ve spent a lot of time investigating various methods for combining different weather station records for the purpose of quantifying long-term