Chart of the Week: Climate: Chennai, Oban, Sapporo

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 (Madras) India

Chen­nai (Madras) India

Chen­nai is warm year-​round with a dis­tinct rainy sea­son in October-​November and light pre­cip­i­ta­tion in Jan– May.

Oban, on the West coast of Scotland

Oban, Scot­land

Oban is on the west­ern coast of Scot­land, near the Hebrides. It’s cooler than Chen­nai and more sea­sonal. It’s a lot less sunny in Win­ter (Nov-​Jan)sapporo

Commentary/​Analysis:

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.

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