This is a mix of select data showing you local differences in dawn temperature. On the recent right side you can see several sources superimposed. My condo Netatmo outside temp (brown) is the highest, probably because of all the walls and concrete that surround the sensor. The yellow points from the Planetorium are very similar, suggesting that the Sukhumvit area overall has a generally elevated temperature probably from urban heat island effects, about +3 C degrees heating.
Red points are Don Muang data, for which I have long term data, and green points from Korat, higher elevation and upcountry, generally 2-3 deg lower than Bangkok. The new airport at Souvanaphoum is also a little lower than Don Muang; it's further out of town.
Notice how last year the morning low at Don Muang was over 30 for several days. No such days this year at Don Muang, so last year's peak was a little worse, because the rains came a little later. (Sukhumvit area is this year is over 30, only because of +3 deg heat island effect). I had earlier expected this year to be worse by comparison, but that was before I realized that my Netatmo local readings were boosted by urban heat island warming.
If I want to estimate Don Muang dawn temperature from my Netatmo data I should subtract 3 deg. These corrected values are also plotted here shown as blue points.
So we have just now this week hit the probable high point in discomfort for 2017. To me it was suffocating. I found myself turning on the aircon all the time. My pub mate Al, exactly my age: "I never complained about the heatt here before, but this year it really hit me." We both thank clouds and rain that are now pulling the dawn temperature down into the mid 20s.
But even now today I am turning on aircon on arriving home at the end of the day, after 6 pm.
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