T hree climate charts showing Chennai (Madras) India, Oban, Scotland UK, and Sapporo, Hokkaido Japan. These charts condense monthly climate data — high, low, average temperature, and days of sunshine into one text-based chart. (Source: Wikipedia)
Chennai is warm year-round with a distinct rainy season in October-November and light precipitation in Jan– May.
Macro level: comparing these charts, there are some items missing (snowfall, average snowy days, mean sunshine hours) in Chennai, due to local conditions. The colors for temperature are consistent (blue to orange), but the average days of precip are not, making it difficult compare each city. It’s easy to see that it is warmer year round in Chennai, and warm, though not as warm as Chennai in Oban and Sapporo. It’s also much snowier (in terms of snowfall) in Jan-Feb in Sapporo. Sapporo is also more sunny, especially in the winter than Oban.
Overall: These charts are effective in visualizing temperature, sunny days, and humidity, but could be improved by being consistent on color scales, so it’s possible to compare multiple cities by region. Additionally measuring the same data points - eg sunny days — in all regions would enable better comparisons. Wikipedia is also less systematic in weather for cities — some cities do not have this chart.