For sure you’ve seen the headlines declaring 2024 likely to be the Hottest year ever. If you’re like me, your response is: That’s not the way it’s going down where I live. Fortunately there is a website that allows anyone to check their personal experience with the weather station data nearby. weatherspark.com provides data summaries for you to judge what’s going on in weather history where you live. In my case a modern weather station is a few miles away Summer 2024 Weather History at Montréal–Mirabel International Airport The story about Summer 2024 is evident below in charts and graphs from this site. There’s a map that allows you to find your locale.
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.
First, consider above the norms for Summer from the period 1980 to 2016.
Then, there’s Summer 2024 compared to the normal observations.
The daily range of reported temperatures (gray bars) and 24-hour highs (red ticks) and lows (blue ticks), placed over the daily average high (faint red line) and low (faint blue line) temperature, with 25th to 75th and 10th to 90th percentile bands.
The graph shows Summer had some warm days, some cool days and overall was pretty normal. But since climate is more than temperature, consider cloudiness.
Wow! Most of the summer was cloudy, which in summer means blocking the warming sun from hitting the surface. And with all those clouds, let’s look at precipitation:
So, in the observations out of 92 summer days, there were 56 days when it rained, including 11 days of thunderstorms with heavy rainfall. Given what we know about the hydrology cycles, that means a lot of heat removed upward from the surface.
So the implications for Summer temperatures in my locale.
There you have it before your eyes. Mostly warm days for the
three summer months, with exactly eleven hot afternoons (>30°C).
Otherwise comfortable and cool, and no hot
afternoons in September.
Summary:
Claims of hottest this or that month or year are based on averages of averages of temperatures, which in principle is an intrinsic quality and distinctive to a locale. The claim involves selecting some places and time periods where warming appears, while ignoring other places where it has been cooling.
Remember: They want you to panic. Before doing so, check out what the data says in your neck of the woods. For example, NOAA declared that “July 2024 was the warmest ever recorded for the globe.”
Science Matters 