Last week I created a bubble chart showing seventeen world cities where warm-season (C4) grasses are usually grown. The cities were plotted by average annual temperature on the x-axis, annual sunshine hours on the y-axis, and the size of each city's "bubble" on the chart was proportional to the city's average annual rainfall.
I have now made additional charts, with the number of cities in the dataset expanded to 46 to give a broader picture of the variability in climatological normals. And I have plotted the data on a month-by-month basis for a more detailed look at how the temperature, sunshine, and rainfall vary throughout the year.
Click the image above to view the bubble chart at a larger size. All data used to generate these plots are from the climatological normal tables for world cities as posted on the Hong Kong Observatory website. The bubble charts were created using the ggplot2 package in R.
I find it interesting to see how the average weather data for different cities change throughout the year. Of the 46 cities plotted here, Hong Kong stands out as having relatively little sunshine (on average) in the month of May. And in cities such as Tokyo and Osaka and Shanghai, where warm-season grasses are almost always used on fairways, the golfing season is well-underway but the temperatures are still too low for the optimum growth of warm-season grasses.
I think there is a lot of information in these plots that turfgrass managers may find interesting. As an example, Miami and Hong Kong have nearly the same average temperature in May, but Miami has more than twice the sunshine hours. This is the season when intensive cultural practices are done to control organic matter in bermudagrass greens in Florida; from looking at the bubble chart above it is obvious that the recuperative ability of bermudagrass at Hong Kong is probably much less in an average May than it would be at Florida.
At which month is the temperature and sunshine at Tokyo the same as Singapore? How does this bubble chart change during the monsoon season in India? And does the sunshine at Hong Kong ever rise to the level of Miami? I'll post a new chart each month to show how the average weather changes in these cities over the course of a year.