Well, thanks to the indispensable US Geological Survey, I now have even more data to back me up. With the help of NASA, the USGS has taken the data on temperature and precipitation from the various climate models used by the IPCC and broken it down to the county level. Thanks to this awesome new tool with a terrible name (NEX-DCP30), you can now find out what the mean temperature projections for April are in Charles Mix County in South Dakota from 2025-2049, if that’s your sort of thing.
NEX-DCP30 provides breakdowns for each county in the continental United States for three time periods (2025-2049, 2050-2074, and 2074-2099), compared to the averages from 1980-2004. You can even toggle between RCP (Representative Concentration Pathway; e.g. projected emissions scenario) 4.5, a mid-range scenario, or RCP 8.5, which is a worst-case scenario. Christmas came early for climate nerds like me.
Naturally I decided to check in on the projections for the state of Ohio and for Cuyahoga County. Here’s what I found.
Using the mid-range warming scenario (RCP 4.5), Ohio’s mean temperature will increase by 2.5°C (4.5°F) during the period 2050-2074. This puts it right in the middle of the pack – it’s average temperature change is tied for 16th of the contiguous 48 states, making it higher than 23 states, tied with 8, and lower than 15.
In the same scenario, Cuyahoga County warms at by 2.6°C (4.7°F), slightly more than the state as a whole. As you can see below, the state appears split along a diagonal line, that starts in Columbiana County and ends by cutting Hamilton in half. Those counties above the line warm at a higher rate than those below it. Overall, in the RCP 4.5 model, Ohio and Cuyahoga County warm at roughly the same rate as the country as a whole.
These rates change under the RCP 8.5 model. Under this scenario, Ohio warms by an alarming 3.6°C (6.5°F) by 2050-2074, a rate of change above the national average. As the map below suggests, those states that are farthest North and/or are located in the interior of the country will experience the most warming. Ohio experiences warming greater than 26 states, the same as 4 states, and less than 18 states. While Alaska will likely see the greatest warming of all 50 states, Minnesota’s 4.0°C is the most among the lower 48.
Once again, under this scenario, Cuyahoga County outpaces the state as a whole. The county will see temperatures increase by 3.7°C (6.7°F). This number exceeds most of the state, though the greatest warming will take place in Northwest Ohio and in the counties along the Indiana border.
Alarmingly, if you fast forward to the end of the century (2074-2099) using RCP 8.5, the picture becomes even bleaker. Ohio warms by a terrifying 5.3°C (9.5°F), while Cuyahoga County once again comes in higher at 5.4°C (9.72°F). The average July temperature in Ohio and Cuyahoga County would increase by 6.4°C, reaching 96.08°F and 93.74°F, respectively. Mid- to upper-90s would become the rule, not the exception.
Cleveland annual mean temperature currently stands at roughly 10°C (50°F), while the annual average maximum temperature of 15°C (59°F). Under a high-emissions scenario, Cleveland’s climate could became much closer to that of Oklahoma City than what we are used to experiencing now.
The current rate of climatic change – which The Geological Society now says is unprecedented in the history of the planet (PDF) – is far beyond what we are able to absorb. For a region that is not acclimatized to extreme heat and is highly vulnerable to heat-related mortality, climate change poses an immense public health risk to Northeast Ohio.
So, once again, I caution you that, while things may not become as bad in Cleveland as they may elsewhere, they’re still going to be crappy. To paraphrase The Lorax, unless we all start caring a whole awful lot, nothing’s going to get better. It’s not.